sfrench/cifs-2.6.git
4 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Sun, 9 Aug 2015 07:38:42 +0000 (09:38 +0200)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull input subsystem fixes from Dmitry Torokhov:
 "Just small ALPS and Elan touchpads, and other driver fixups"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: elantech - add special check for fw_version 0x470f01 touchpad
  Input: twl4030-vibra - fix ERROR: Bad of_node_put() warning
  Input: alps - only Dell laptops have separate button bits for v2 dualpoint sticks
  Input: axp20x-pek - add module alias
  Input: turbografx - fix potential out of bound access

4 years agoMerge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Linus Torvalds [Sun, 9 Aug 2015 02:59:21 +0000 (05:59 +0300)]
Merge branch 'upstream' of git://git.linux-mips.org/ralf/upstream-linus

Pull MIPS fixes from Ralf Baechle:
 "Another round of MIPS fixes for 4.2.  No area does particularly stand
  out but we have a two unpleasant ones:

   - Kernel ptes are marked with a global bit which allows the kernel to
     share kernel TLB entries between all processes.  For this to work
     both entries of an adjacent even/odd pte pair need to have the
     global bit set.  There has been a subtle race in setting the other
     entry's global bit since ~ 2000 but it take particularly
     pathological workloads that essentially do mostly vmalloc/vfree to
     trigger this.

     This pull request fixes the 64-bit case but leaves the case of 32
     bit CPUs with 64 bit ptes unsolved for now.  The unfixed cases
     affect hardware that is not available in the field yet.

   - Instruction emulation requires loading instructions from user space
     but the current fast but simplistic approach will fail on pages
     that are PROT_EXEC but !PROT_READ.  For this reason we temporarily
     do not permit this permission and will map pages with PROT_EXEC |
     PROT_READ.

  The remainder of this pull request is more or less across the field
  and the short log explains them well"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: Make set_pte() SMP safe.
  MIPS: Replace add and sub instructions in relocate_kernel.S with addiu
  MIPS: Flush RPS on kernel entry with EVA
  Revert "MIPS: BCM63xx: Provide a plat_post_dma_flush hook"
  MIPS: BMIPS: Delete unused Kconfig symbol
  MIPS: Export get_c0_perfcount_int()
  MIPS: show_stack: Fix stack trace with EVA
  MIPS: do_mcheck: Fix kernel code dump with EVA
  MIPS: SMP: Don't increment irq_count multiple times for call function IPIs
  MIPS: Partially disable RIXI support.
  MIPS: Handle page faults of executable but unreadable pages correctly.
  MIPS: Malta: Don't reinitialise RTC
  MIPS: unaligned: Fix build error on big endian R6 kernels
  MIPS: Fix sched_getaffinity with MT FPAFF enabled
  MIPS: Fix build with CONFIG_OF=y for non OF-enabled targets
  CPUFREQ: Loongson2: Fix broken build due to incorrect include.

4 years agoMerge branch 'for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
Linus Torvalds [Sun, 9 Aug 2015 02:56:31 +0000 (05:56 +0300)]
Merge branch 'for-linus-4.2' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fix from Chris Mason:
 "We have a btrfs quota regression fix.

  I merged this one on Thursday and have run it through tests against
  current master.

  Normally I wouldn't have sent this while you were finalizing rc6, but
  I'm feeding mosquitoes in the adirondacks next week, so I wanted to
  get this one out before leaving.  I'll leave longer tests running and
  check on things during the week, but I don't expect any problems"

* 'for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: qgroup: Fix a regression in qgroup reserved space.

4 years agoMerge branch 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
Linus Torvalds [Sun, 9 Aug 2015 02:54:27 +0000 (05:54 +0300)]
Merge branch 'for-rc' of git://git./linux/kernel/git/rzhang/linux

Pull thermal management fixes from Zhang Rui:
 "Specifics:

   - fix an error that "weight_attr" sysfs attribute is not removed
     while unbinding.  From: Viresh Kumar.

   - fix power allocator governor tracing to return the real request.
     From Javi Merino.

   - remove redundant owner assignment of hisi platform thermal driver.
     From Krzysztof Kozlowski.

   - a couple of small fixes of Exynos thermal driver.  From Krzysztof
     Kozlowski and Chanwoo Choi"

* 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
  thermal: Drop owner assignment from platform_driver
  thermal: exynos: Remove unused code related to platform_data on probe()
  thermal: exynos: Add the dependency of CONFIG_THERMAL_OF instead of CONFIG_OF
  thermal: exynos: Disable the regulator on probe failure
  thermal: power_allocator: trace the real requested power
  thermal: remove dangling 'weight_attr' device file

4 years agoMerge tag 'arc-v4.2-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupt...
Linus Torvalds [Sat, 8 Aug 2015 01:38:00 +0000 (04:38 +0300)]
Merge tag 'arc-v4.2-rc6-fixes' of git://git./linux/kernel/git/vgupta/arc

Pull ARC fixes from Vineet Gupta:
 "Here's a late pull request for accumulated ARC fixes which came out of
  extended testing of the new ARCv2 port with LTP etc.  llock/scond
  livelock workaround has been reviewed by PeterZ.  The changes look a
  lot but I've crafted them into finer grained patches for better
  tracking later.

  I have some more fixes (ARC Futex backend) ready to go but those will
  have to wait for tglx to return from vacation.

  Summary:
   - Enable a reduced config of HS38 (w/o div-rem, ll64...)
   - Add software workaround for LLOCK/SCOND livelock
   - Fallout of a recent pt_regs update"

* tag 'arc-v4.2-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff
  ARC: Make pt_regs regs unsigned
  ARCv2: spinlock/rwlock: Reset retry delay when starting a new spin-wait cycle
  ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff
  ARC: LLOCK/SCOND based rwlock
  ARC: LLOCK/SCOND based spin_lock
  ARC: refactor atomic inline asm operands with symbolic names
  Revert "ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock"
  ARCv2: [axs103_smp] Reduce clk for Quad FPGA configs
  ARCv2: Fix the peripheral address space detection
  ARCv2: allow selection of page size for MMUv4
  ARCv2: lib: memset: Don't assume 64-bit load/stores
  ARCv2: lib: memcpy: Missing PREFETCHW
  ARCv2: add knob for DIV_REV in Kconfig
  ARC/time: Migrate to new 'set-state' interface

4 years agoMerge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
Linus Torvalds [Sat, 8 Aug 2015 01:36:40 +0000 (04:36 +0300)]
Merge tag 'for_linus' of git://git./linux/kernel/git/mst/vhost

Pull virtio fix from Michael Tsirkin:
 "A last minute fix for the new virtio input driver.  It seems pretty
   obvious, and the problem it's fixing would be quite hard to debug"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio-input: reset device and detach unused during remove

4 years agoMerge tag 'dm-4.2-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
Linus Torvalds [Sat, 8 Aug 2015 01:35:14 +0000 (04:35 +0300)]
Merge tag 'dm-4.2-fixes-4' of git://git./linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - stable fix for a dm_merge_bvec() regression on 32 bit Fedora systems.

 - fix for a 4.2 DM thinp discard regression due to inability to
   properly delete a range of blocks in a data mapping btree.

* tag 'dm-4.2-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm btree remove: fix bug in remove_one()
  dm: fix dm_merge_bvec regression on 32 bit systems

4 years agoMerge tag 'sound-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Sat, 8 Aug 2015 01:33:35 +0000 (04:33 +0300)]
Merge tag 'sound-4.2-rc6' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "The only bulk changes in this request is ABI updates for ASoC topology
  API.  It's a new API that was introduced in 4.2, and we'd like to
  avoid ABI change after the release, so it's taken now.  As there is no
  real in-tree user for this API, it should be fairly safe.

  Other than that, the usual small fixes are found in various drivers:
  ASoC cs4265, rt5645, intel-sst, firewire, oxygen and HD-audio"

* tag 'sound-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ASoC: topology: Add private data type and bump ABI version to 3
  ASoC: topology: Add ops support to byte controls UAPI
  ASoC: topology: Update TLV support so we can support more TLV types
  ASoC: topology: add private data to manifest
  ASoC: topology: Add subsequence in topology
  ALSA: hda - one Dell machine needs the headphone white noise fixup
  ALSA: fireworks/firewire-lib: add support for recent firmware quirk
  Revert "ALSA: fireworks: add support for AudioFire2 quirk"
  ASoC: topology: fix typo in soc_tplg_kcontrol_bind_io()
  ALSA: HDA: Dont check return for snd_hdac_chip_readl
  ALSA: HDA: Fix stream assignment for host in decoupled mode
  ASoC: rt5645: Fix lost pin setting for DMIC1
  ALSA: oxygen: Fix logical-not-parentheses warning
  ASoC: Intel: sst_byt: fix initialize 'NULL device *' issue
  ASoC: Intel: haswell: fix initialize 'NULL device *' issue
  ASoC: cs4265: Fix setting dai format for Left/Right Justified

4 years agoMerge tag 'hwmon-for-linus-v4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 8 Aug 2015 01:30:37 +0000 (04:30 +0300)]
Merge tag 'hwmon-for-linus-v4.2-rc6' of git://git./linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Export module alias information in g762 and nct7904 to support
   auto-loading.

 - Blacklist Dell Studio XPS 8100 in dell-smm to fix fan control
   problems.

* tag 'hwmon-for-linus-v4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (g762) Export OF module alias information
  hwmon: (nct7904) Export I2C module alias information
  hwmon: (dell-smm) Blacklist Dell Studio XPS 8100

4 years agoMerge tag 'usb-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sat, 8 Aug 2015 01:27:51 +0000 (04:27 +0300)]
Merge tag 'usb-4.2-rc6' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are some USB and PHY fixes for 4.2-rc6 that resolve some reported
  issues.

  All of these have been in the linux-next tree for a while, full
  details on the patches are in the shortlog below"

* tag 'usb-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY
  drivers/usb: Delete XHCI command timer if necessary
  xhci: fix off by one error in TRB DMA address boundary check
  usb: udc: core: add device_del() call to error pathway
  phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock
  phy-sun4i-usb: Add missing EXPORT_SYMBOL_GPL for sun4i_usb_phy_set_squelch_detect
  USB: sierra: add 1199:68AB device ID
  usb: gadget: f_printer: actually limit the number of instances
  usb: gadget: f_hid: actually limit the number of instances
  usb: gadget: f_uac2: fix calculation of uac2->p_interval
  usb: gadget: bdc: fix a driver crash on disconnect
  usb: chipidea: ehci_init_driver is intended to call one time
  USB: qcserial: Add support for Dell Wireless 5809e 4G Modem
  USB: qcserial/option: make AT URCs work for Sierra Wireless MC7305/MC7355

4 years agoMerge tag 'staging-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sat, 8 Aug 2015 01:26:31 +0000 (04:26 +0300)]
Merge tag 'staging-4.2-rc6' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are three bugfixes for some staging driver issues that have been
  reported.  All have been in the linux-next tree for a while"

* tag 'staging-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: lustre: Include unaligned.h instead of access_ok.h
  staging: vt6655: vnt_bss_info_changed check conf->beacon_rate is not NULL
  staging: comedi: das1800: add missing break in switch

4 years agoMerge tag 'char-misc-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sat, 8 Aug 2015 01:25:10 +0000 (04:25 +0300)]
Merge tag 'char-misc-4.2-rc6' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc fixes from Greg KH:
 "Here are some extcon fixes for 4.2-rc6 that resolve some reported
  problems.

  All have been in linux-next for a while"

* tag 'char-misc-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  extcon: Fix extcon_cable_get_state() from getting old state after notification
  extcon: Fix hang and extcon_get/set_cable_state().
  extcon: palmas: Fix NULL pointer error

4 years agoMerge tag 'drm-intel-fixes-2015-08-07' of git://anongit.freedesktop.org/drm-intel
Linus Torvalds [Sat, 8 Aug 2015 01:18:14 +0000 (04:18 +0300)]
Merge tag 'drm-intel-fixes-2015-08-07' of git://anongit.freedesktop.org/drm-intel

Pull drm fixes from Daniel Vetter:
 "One i915 regression fix and a drm core one since Dave's not around,
  both introduced in 4.2 so not cc: stable.

  The fix for the warning Ted reported isn't in here yet since he didn't
  yet supply a tested-by and I can't repro this one myself (it's in
  fixup code that needs firmware doing something i915 wouldn't do)"

* tag 'drm-intel-fixes-2015-08-07' of git://anongit.freedesktop.org/drm-intel:
  drm/vblank: Use u32 consistently for vblank counters
  drm/i915: Allow parsing of variable size child device entries from VBT

4 years agoInput: elantech - add special check for fw_version 0x470f01 touchpad
Duson Lin [Fri, 7 Aug 2015 21:37:24 +0000 (14:37 -0700)]
Input: elantech - add special check for fw_version 0x470f01 touchpad

It is no need to check the packet[0] for sanity check when doing
elantech_packet_check_v4() function for fw_version = 0x470f01 touchpad.

Signed-off by: Duson Lin <dusonlin@emc.com.tw>
Reviewed-by: Ulrik De Bie <ulrik.debie-os@e2big.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
4 years agodm btree remove: fix bug in remove_one()
Joe Thornber [Fri, 7 Aug 2015 15:33:01 +0000 (16:33 +0100)]
dm btree remove: fix bug in remove_one()

remove_one() was not incrementing the key for the beginning of the
range, so not all entries were being removed.  This resulted in
discards that were not unmapping all blocks.

Fixes: 4ec331c3ea ("dm btree: add dm_btree_remove_leaves()")
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
4 years agodrm/vblank: Use u32 consistently for vblank counters
Daniel Vetter [Fri, 7 Aug 2015 10:31:17 +0000 (12:31 +0200)]
drm/vblank: Use u32 consistently for vblank counters

In

commit 99264a61dfcda41d86d0960cf2d4c0fc2758a773
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Apr 15 19:34:43 2015 +0200

    drm/vblank: Fixup and document timestamp update/read barriers

I've switched vblank->count from atomic_t to unsigned long and
accidentally created an integer comparison bug in
drm_vblank_count_and_time since vblanke->count might overflow the u32
local copy and hence the retry loop never succeed.

Fix this by consistently using u32.

Cc: Michel Dänzer <michel@daenzer.net>
Reported-by: Michel Dänzer <michel@daenzer.net>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
4 years agoMerge tag 'asoc-fix-v4.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/brooni...
Takashi Iwai [Fri, 7 Aug 2015 11:53:41 +0000 (13:53 +0200)]
Merge tag 'asoc-fix-v4.2-rc5' of git://git./linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v4.2

There are a couple of small driver specific fixes here but the
overwhelming bulk of these changes are fixes to the topology ABI that
has been newly introduced in v4.2.  Once this makes it into a release we
will have to firm this up but for now getting enhancements in before
they've made it into a release is the most expedient thing.

4 years agoARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff
Vineet Gupta [Fri, 7 Aug 2015 07:31:39 +0000 (13:01 +0530)]
ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff

The increment of delay counter was 2 instructions:
Arithmatic Shfit Left (ASL) + set to 1 on overflow

This can be done in 1 using ROtate Left (ROL)

Suggested-by: Nigel Topham <ntopham@synopsys.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Linus Torvalds [Fri, 7 Aug 2015 02:28:24 +0000 (05:28 +0300)]
Merge git://git./linux/kernel/git/davem/sparc

Pull sparc fix from David Miller:
 "FPU register corruption bug fix"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Fix userspace FPU register corruptions.

4 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 7 Aug 2015 02:20:40 +0000 (05:20 +0300)]
Merge branch 'akpm' (patches from Andrew)

Merge fixes from Andrew Morton:
 "21 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (21 commits)
  writeback: fix initial dirty limit
  mm/memory-failure: set PageHWPoison before migrate_pages()
  mm: check __PG_HWPOISON separately from PAGE_FLAGS_CHECK_AT_*
  mm/memory-failure: give up error handling for non-tail-refcounted thp
  mm/memory-failure: fix race in counting num_poisoned_pages
  mm/memory-failure: unlock_page before put_page
  ipc: use private shmem or hugetlbfs inodes for shm segments.
  mm: initialize hotplugged pages as reserved
  ocfs2: fix shift left overflow
  kthread: export kthread functions
  fsnotify: fix oops in fsnotify_clear_marks_by_group_flags()
  lib/iommu-common.c: do not use 0xffffffffffffffffl for computing align_mask
  mm/slub: allow merging when SLAB_DEBUG_FREE is set
  signalfd: fix information leak in signalfd_copyinfo
  signal: fix information leak in copy_siginfo_to_user
  signal: fix information leak in copy_siginfo_from_user32
  ocfs2: fix BUG in ocfs2_downconvert_thread_do_work()
  fs, file table: reinit files_stat.max_files after deferred memory initialisation
  mm, meminit: replace rwsem with completion
  mm, meminit: allow early_pfn_to_nid to be used during runtime
  ...

4 years agosparc64: Fix userspace FPU register corruptions.
David S. Miller [Fri, 7 Aug 2015 02:13:25 +0000 (19:13 -0700)]
sparc64: Fix userspace FPU register corruptions.

If we have a series of events from userpsace, with %fprs=FPRS_FEF,
like follows:

ETRAP
ETRAP
VIS_ENTRY(fprs=0x4)
VIS_EXIT
RTRAP (kernel FPU restore with fpu_saved=0x4)
RTRAP

We will not restore the user registers that were clobbered by the FPU
using kernel code in the inner-most trap.

Traps allocate FPU save slots in the thread struct, and FPU using
sequences save the "dirty" FPU registers only.

This works at the initial trap level because all of the registers
get recorded into the top-level FPU save area, and we'll return
to userspace with the FPU disabled so that any FPU use by the user
will take an FPU disabled trap wherein we'll load the registers
back up properly.

But this is not how trap returns from kernel to kernel operate.

The simplest fix for this bug is to always save all FPU register state
for anything other than the top-most FPU save area.

Getting rid of the optimized inner-slot FPU saving code ends up
making VISEntryHalf degenerate into plain VISEntry.

Longer term we need to do something smarter to reinstate the partial
save optimizations.  Perhaps the fundament error is having trap entry
and exit allocate FPU save slots and restore register state.  Instead,
the VISEntry et al. calls should be doing that work.

This bug is about two decades old.

Reported-by: James Y Knight <jyknight@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge branch 'drm-fixes-4.2' of git://people.freedesktop.org/~agd5f/linux
Linus Torvalds [Fri, 7 Aug 2015 01:51:14 +0000 (04:51 +0300)]
Merge branch 'drm-fixes-4.2' of git://people.freedesktop.org/~agd5f/linux

Pull amdgpu fixes from Alex Deucher:
 "Just a few amdgpu fixes to make sure we report the proper firmware
  information and number of render buffers to userspace and a typo in a
  debugging function"

[ Pulling directly from Alex since Dave Airlie is on vacation  - Linus ]

* 'drm-fixes-4.2' of git://people.freedesktop.org/~agd5f/linux:
  drm/amdgpu: set fw_version and feature_version for smu fw loading
  drm/amdgpu: add feature version for SDMA ucode
  drm/amdgpu: add feature version for RLC and MEC v2
  drm/amdgpu: increment queue when iterating on this variable.
  drm/amdgpu: fix rb setting for CZ

4 years agoMerge branch 'drm-tda998x-fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Linus Torvalds [Fri, 7 Aug 2015 01:48:46 +0000 (04:48 +0300)]
Merge branch 'drm-tda998x-fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

Pull TDA998x i2c driver fixes from Russell King:
 "This fixes the double-checksumming of the AVI infoframe which was
  resulting in the checksum always being zero.  It went unnoticed as
  none of my HDMI devices had a problem with this"

[ Pulling directly from rmk since Dave Airlie is on vacation  - Linus ]

* 'drm-tda998x-fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  drm/i2c: tda998x: fix bad checksum of the HDMI AVI infoframe

4 years agowriteback: fix initial dirty limit
Rabin Vincent [Thu, 6 Aug 2015 22:47:14 +0000 (15:47 -0700)]
writeback: fix initial dirty limit

The initial value of global_wb_domain.dirty_limit set by
writeback_set_ratelimit() is zeroed out by the memset in
wb_domain_init().

Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/memory-failure: set PageHWPoison before migrate_pages()
Naoya Horiguchi [Thu, 6 Aug 2015 22:47:11 +0000 (15:47 -0700)]
mm/memory-failure: set PageHWPoison before migrate_pages()

Now page freeing code doesn't consider PageHWPoison as a bad page, so by
setting it before completing the page containment, we can prevent the
error page from being reused just after successful page migration.

I added TTU_IGNORE_HWPOISON for try_to_unmap() to make sure that the
page table entry is transformed into migration entry, not to hwpoison
entry.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm: check __PG_HWPOISON separately from PAGE_FLAGS_CHECK_AT_*
Naoya Horiguchi [Thu, 6 Aug 2015 22:47:08 +0000 (15:47 -0700)]
mm: check __PG_HWPOISON separately from PAGE_FLAGS_CHECK_AT_*

The race condition addressed in commit add05cecef80 ("mm: soft-offline:
don't free target page in successful page migration") was not closed
completely, because that can happen not only for soft-offline, but also
for hard-offline.  Consider that a slab page is about to be freed into
buddy pool, and then an uncorrected memory error hits the page just
after entering __free_one_page(), then VM_BUG_ON_PAGE(page->flags &
PAGE_FLAGS_CHECK_AT_PREP) is triggered, despite the fact that it's not
necessary because the data on the affected page is not consumed.

To solve it, this patch drops __PG_HWPOISON from page flag checks at
allocation/free time.  I think it's justified because __PG_HWPOISON
flags is defined to prevent the page from being reused, and setting it
outside the page's alloc-free cycle is a designed behavior (not a bug.)

For recent months, I was annoyed about BUG_ON when soft-offlined page
remains on lru cache list for a while, which is avoided by calling
put_page() instead of putback_lru_page() in page migration's success
path.  This means that this patch reverts a major change from commit
add05cecef80 about the new refcounting rule of soft-offlined pages, so
"reuse window" revives.  This will be closed by a subsequent patch.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/memory-failure: give up error handling for non-tail-refcounted thp
Naoya Horiguchi [Thu, 6 Aug 2015 22:47:04 +0000 (15:47 -0700)]
mm/memory-failure: give up error handling for non-tail-refcounted thp

"non anonymous thp" case is still racy with freeing thp, which causes
panic due to put_page() for refcount-0 page.  It seems that closing up
this race might be hard (and/or not worth doing,) so let's give up the
error handling for this case.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/memory-failure: fix race in counting num_poisoned_pages
Naoya Horiguchi [Thu, 6 Aug 2015 22:47:01 +0000 (15:47 -0700)]
mm/memory-failure: fix race in counting num_poisoned_pages

When memory_failure() is called on a page which are just freed after
page migration from soft offlining, the counter num_poisoned_pages is
raised twi= ce.  So let's fix it with using TestSetPageHWPoison.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/memory-failure: unlock_page before put_page
Naoya Horiguchi [Thu, 6 Aug 2015 22:46:58 +0000 (15:46 -0700)]
mm/memory-failure: unlock_page before put_page

Recently I addressed a few of hwpoison race problems and the patches are
merged on v4.2-rc1.  It made progress, but unfortunately some problems
still remain due to less coverage of my testing.  So I'm trying to fix
or avoid them in this series.

One point I'm expecting to discuss is that patch 4/5 changes the page
flag set to be checked on free time.  In current behavior, __PG_HWPOISON
is not supposed to be set when the page is freed.  I think that there is
no strong reason for this behavior, and it causes a problem hard to fix
only in error handler side (because __PG_HWPOISON could be set at
arbitrary timing.) So I suggest to change it.

With this patchset, hwpoison stress testing in official mce-test
testsuite (which previously failed) passes.

This patch (of 5):

In "just unpoisoned" path, we do put_page and then unlock_page, which is
a wrong order and causes "freeing locked page" bug.  So let's fix it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoipc: use private shmem or hugetlbfs inodes for shm segments.
Stephen Smalley [Thu, 6 Aug 2015 22:46:55 +0000 (15:46 -0700)]
ipc: use private shmem or hugetlbfs inodes for shm segments.

The shm implementation internally uses shmem or hugetlbfs inodes for shm
segments.  As these inodes are never directly exposed to userspace and
only accessed through the shm operations which are already hooked by
security modules, mark the inodes with the S_PRIVATE flag so that inode
security initialization and permission checking is skipped.

This was motivated by the following lockdep warning:

  ======================================================
   [ INFO: possible circular locking dependency detected ]
   4.2.0-0.rc3.git0.1.fc24.x86_64+debug #1 Tainted: G        W
  -------------------------------------------------------
   httpd/1597 is trying to acquire lock:
   (&ids->rwsem){+++++.}, at: shm_close+0x34/0x130
   but task is already holding lock:
   (&mm->mmap_sem){++++++}, at: SyS_shmdt+0x4b/0x180
   which lock already depends on the new lock.
   the existing dependency chain (in reverse order) is:
   -> #3 (&mm->mmap_sem){++++++}:
        lock_acquire+0xc7/0x270
        __might_fault+0x7a/0xa0
        filldir+0x9e/0x130
        xfs_dir2_block_getdents.isra.12+0x198/0x1c0 [xfs]
        xfs_readdir+0x1b4/0x330 [xfs]
        xfs_file_readdir+0x2b/0x30 [xfs]
        iterate_dir+0x97/0x130
        SyS_getdents+0x91/0x120
        entry_SYSCALL_64_fastpath+0x12/0x76
   -> #2 (&xfs_dir_ilock_class){++++.+}:
        lock_acquire+0xc7/0x270
        down_read_nested+0x57/0xa0
        xfs_ilock+0x167/0x350 [xfs]
        xfs_ilock_attr_map_shared+0x38/0x50 [xfs]
        xfs_attr_get+0xbd/0x190 [xfs]
        xfs_xattr_get+0x3d/0x70 [xfs]
        generic_getxattr+0x4f/0x70
        inode_doinit_with_dentry+0x162/0x670
        sb_finish_set_opts+0xd9/0x230
        selinux_set_mnt_opts+0x35c/0x660
        superblock_doinit+0x77/0xf0
        delayed_superblock_init+0x10/0x20
        iterate_supers+0xb3/0x110
        selinux_complete_init+0x2f/0x40
        security_load_policy+0x103/0x600
        sel_write_load+0xc1/0x750
        __vfs_write+0x37/0x100
        vfs_write+0xa9/0x1a0
        SyS_write+0x58/0xd0
        entry_SYSCALL_64_fastpath+0x12/0x76
  ...

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Reported-by: Morten Stevens <mstevens@fedoraproject.org>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm: initialize hotplugged pages as reserved
Mel Gorman [Thu, 6 Aug 2015 22:46:51 +0000 (15:46 -0700)]
mm: initialize hotplugged pages as reserved

Commit 92923ca3aace ("mm: meminit: only set page reserved in the
memblock region") broke memory hotplug which expects the memmap for
newly added sections to be reserved until onlined by
online_pages_range().  This patch marks hotplugged pages as reserved
when adding new zones.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: David Vrabel <david.vrabel@citrix.com>
Tested-by: David Vrabel <david.vrabel@citrix.com>
Cc: Nathan Zimmer <nzimmer@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoocfs2: fix shift left overflow
Joseph Qi [Thu, 6 Aug 2015 22:46:48 +0000 (15:46 -0700)]
ocfs2: fix shift left overflow

When using a large volume, for example 9T volume with 2T already used,
frequent creation of small files with O_DIRECT when the IO is not
cluster aligned may clear sectors in the wrong place.  This will cause
filesystem corruption.

This is because p_cpos is a u32.  When calculating the corresponding
sector it should be converted to u64 first, otherwise it may overflow.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: <stable@vger.kernel.org> [4.0+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agokthread: export kthread functions
David Kershner [Thu, 6 Aug 2015 22:46:45 +0000 (15:46 -0700)]
kthread: export kthread functions

The s-Par visornic driver, currently in staging, processes a queue being
serviced by the an s-Par service partition.  We can get a message that
something has happened with the Service Partition, when that happens, we
must not access the channel until we get a message that the service
partition is back again.

The visornic driver has a thread for processing the channel, when we get
the message, we need to be able to park the thread and then resume it
when the problem clears.

We can do this with kthread_park and unpark but they are not exported
from the kernel, this patch exports the needed functions.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Weinberger <richard.weinberger@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agofsnotify: fix oops in fsnotify_clear_marks_by_group_flags()
Jan Kara [Thu, 6 Aug 2015 22:46:42 +0000 (15:46 -0700)]
fsnotify: fix oops in fsnotify_clear_marks_by_group_flags()

fsnotify_clear_marks_by_group_flags() can race with
fsnotify_destroy_marks() so that when fsnotify_destroy_mark_locked()
drops mark_mutex, a mark from the list iterated by
fsnotify_clear_marks_by_group_flags() can be freed and thus the next
entry pointer we have cached may become stale and we dereference free
memory.

Fix the problem by first moving marks to free to a special private list
and then always free the first entry in the special list.  This method
is safe even when entries from the list can disappear once we drop the
lock.

Signed-off-by: Jan Kara <jack@suse.com>
Reported-by: Ashish Sangwan <a.sangwan@samsung.com>
Reviewed-by: Ashish Sangwan <a.sangwan@samsung.com>
Cc: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agolib/iommu-common.c: do not use 0xffffffffffffffffl for computing align_mask
Sowmini Varadhan [Thu, 6 Aug 2015 22:46:39 +0000 (15:46 -0700)]
lib/iommu-common.c: do not use 0xffffffffffffffffl for computing align_mask

Using a 64 bit constant generates "warning: integer constant is too
large for 'long' type" on 32 bit platforms.  Instead use ~0ul and
BITS_PER_LONG.

Detected by Andrew Morton on ARMD.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/slub: allow merging when SLAB_DEBUG_FREE is set
Konstantin Khlebnikov [Thu, 6 Aug 2015 22:46:36 +0000 (15:46 -0700)]
mm/slub: allow merging when SLAB_DEBUG_FREE is set

This patch fixes creation of new kmem-caches after enabling
sanity_checks for existing mergeable kmem-caches in runtime: before that
patch creation fails because unique name in sysfs already taken by
existing kmem-cache.

Unlike other debug options this doesn't change object layout and could
be enabled and disabled at any time.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agosignalfd: fix information leak in signalfd_copyinfo
Amanieu d'Antras [Thu, 6 Aug 2015 22:46:33 +0000 (15:46 -0700)]
signalfd: fix information leak in signalfd_copyinfo

This function may copy the si_addr_lsb field to user mode when it hasn't
been initialized, which can leak kernel stack data to user mode.

Just checking the value of si_code is insufficient because the same
si_code value is shared between multiple signals.  This is solved by
checking the value of si_signo in addition to si_code.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agosignal: fix information leak in copy_siginfo_to_user
Amanieu d'Antras [Thu, 6 Aug 2015 22:46:29 +0000 (15:46 -0700)]
signal: fix information leak in copy_siginfo_to_user

This function may copy the si_addr_lsb, si_lower and si_upper fields to
user mode when they haven't been initialized, which can leak kernel
stack data to user mode.

Just checking the value of si_code is insufficient because the same
si_code value is shared between multiple signals.  This is solved by
checking the value of si_signo in addition to si_code.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agosignal: fix information leak in copy_siginfo_from_user32
Amanieu d'Antras [Thu, 6 Aug 2015 22:46:26 +0000 (15:46 -0700)]
signal: fix information leak in copy_siginfo_from_user32

This function can leak kernel stack data when the user siginfo_t has a
positive si_code value.  The top 16 bits of si_code descibe which fields
in the siginfo_t union are active, but they are treated inconsistently
between copy_siginfo_from_user32, copy_siginfo_to_user32 and
copy_siginfo_to_user.

copy_siginfo_from_user32 is called from rt_sigqueueinfo and
rt_tgsigqueueinfo in which the user has full control overthe top 16 bits
of si_code.

This fixes the following information leaks:
x86:   8 bytes leaked when sending a signal from a 32-bit process to
       itself. This leak grows to 16 bytes if the process uses x32.
       (si_code = __SI_CHLD)
x86:   100 bytes leaked when sending a signal from a 32-bit process to
       a 64-bit process. (si_code = -1)
sparc: 4 bytes leaked when sending a signal from a 32-bit process to a
       64-bit process. (si_code = any)

parsic and s390 have similar bugs, but they are not vulnerable because
rt_[tg]sigqueueinfo have checks that prevent sending a positive si_code
to a different process.  These bugs are also fixed for consistency.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoocfs2: fix BUG in ocfs2_downconvert_thread_do_work()
Joseph Qi [Thu, 6 Aug 2015 22:46:23 +0000 (15:46 -0700)]
ocfs2: fix BUG in ocfs2_downconvert_thread_do_work()

The "BUG_ON(list_empty(&osb->blocked_lock_list))" in
ocfs2_downconvert_thread_do_work can be triggered in the following case:

ocfs2dc has firstly saved osb->blocked_lock_count to local varibale
processed, and then processes the dentry lockres.  During the dentry
put, it calls iput and then deletes rw, inode and open lockres from
blocked list in ocfs2_mark_lockres_freeing.  And this causes the
variable `processed' to not reflect the number of blocked lockres to be
processed, which triggers the BUG.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agofs, file table: reinit files_stat.max_files after deferred memory initialisation
Mel Gorman [Thu, 6 Aug 2015 22:46:20 +0000 (15:46 -0700)]
fs, file table: reinit files_stat.max_files after deferred memory initialisation

Dave Hansen reported the following;

My laptop has been behaving strangely with 4.2-rc2.  Once I log
in to my X session, I start getting all kinds of strange errors
from applications and see this in my dmesg:

         VFS: file-max limit 8192 reached

The problem is that the file-max is calculated before memory is fully
initialised and miscalculates how much memory the kernel is using.  This
patch recalculates file-max after deferred memory initialisation.  Note
that using memory hotplug infrastructure would not have avoided this
problem as the value is not recalculated after memory hot-add.

4.1:             files_stat.max_files = 6582781
4.2-rc2:         files_stat.max_files = 8192
4.2-rc2 patched: files_stat.max_files = 6562467

Small differences with the patch applied and 4.1 but not enough to matter.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: Dave Hansen <dave.hansen@intel.com>
Cc: Nicolai Stange <nicstange@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Alex Ng <alexng@microsoft.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm, meminit: replace rwsem with completion
Nicolai Stange [Thu, 6 Aug 2015 22:46:16 +0000 (15:46 -0700)]
mm, meminit: replace rwsem with completion

Commit 0e1cc95b4cc7 ("mm: meminit: finish initialisation of struct pages
before basic setup") introduced a rwsem to signal completion of the
initialization workers.

Lockdep complains about possible recursive locking:
  =============================================
  [ INFO: possible recursive locking detected ]
  4.1.0-12802-g1dc51b8 #3 Not tainted
  ---------------------------------------------
  swapper/0/1 is trying to acquire lock:
  (pgdat_init_rwsem){++++.+},
    at: [<ffffffff8424c7fb>] page_alloc_init_late+0xc7/0xe6

  but task is already holding lock:
  (pgdat_init_rwsem){++++.+},
    at: [<ffffffff8424c772>] page_alloc_init_late+0x3e/0xe6

Replace the rwsem by a completion together with an atomic
"outstanding work counter".

[peterz@infradead.org: Barrier removal on the grounds of being pointless]
[mgorman@suse.de: Applied review feedback]
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Alex Ng <alexng@microsoft.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm, meminit: allow early_pfn_to_nid to be used during runtime
Mel Gorman [Thu, 6 Aug 2015 22:46:13 +0000 (15:46 -0700)]
mm, meminit: allow early_pfn_to_nid to be used during runtime

early_pfn_to_nid() historically was inherently not SMP safe but only
used during boot which is inherently single threaded or during hotplug
which is protected by a giant mutex.

With deferred memory initialisation there was a thread-safe version
introduced and the early_pfn_to_nid would trigger a BUG_ON if used
unsafely.  Memory hotplug hit that check.  This patch makes
early_pfn_to_nid introduces a lock to make it safe to use during
hotplug.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: Alex Ng <alexng@microsoft.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Nicolai Stange <nicstange@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoipc: modify message queue accounting to not take kernel data structures into account
Marcus Gelderie [Thu, 6 Aug 2015 22:46:10 +0000 (15:46 -0700)]
ipc: modify message queue accounting to not take kernel data structures into account

A while back, the message queue implementation in the kernel was
improved to use btrees to speed up retrieval of messages, in commit
d6629859b36d ("ipc/mqueue: improve performance of send/recv").

That patch introducing the improved kernel handling of message queues
(using btrees) has, as a by-product, changed the meaning of the QSIZE
field in the pseudo-file created for the queue.  Before, this field
reflected the size of the user-data in the queue.  Since, it also takes
kernel data structures into account.  For example, if 13 bytes of user
data are in the queue, on my machine the file reports a size of 61
bytes.

There was some discussion on this topic before (for example
https://lkml.org/lkml/2014/10/1/115).  Commenting on a th lkml, Michael
Kerrisk gave the following background
(https://lkml.org/lkml/2015/6/16/74):

    The pseudofiles in the mqueue filesystem (usually mounted at
    /dev/mqueue) expose fields with metadata describing a message
    queue. One of these fields, QSIZE, as originally implemented,
    showed the total number of bytes of user data in all messages in
    the message queue, and this feature was documented from the
    beginning in the mq_overview(7) page. In 3.5, some other (useful)
    work happened to break the user-space API in a couple of places,
    including the value exposed via QSIZE, which now includes a measure
    of kernel overhead bytes for the queue, a figure that renders QSIZE
    useless for its original purpose, since there's no way to deduce
    the number of overhead bytes consumed by the implementation.
    (The other user-space breakage was subsequently fixed.)

This patch removes the accounting of kernel data structures in the
queue.  Reporting the size of these data-structures in the QSIZE field
was a breaking change (see Michael's comment above).  Without the QSIZE
field reporting the total size of user-data in the queue, there is no
way to deduce this number.

It should be noted that the resource limit RLIMIT_MSGQUEUE is counted
against the worst-case size of the queue (in both the old and the new
implementation).  Therefore, the kernel overhead accounting in QSIZE is
not necessary to help the user understand the limitations RLIMIT imposes
on the processes.

Signed-off-by: Marcus Gelderie <redmnic@gmail.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: John Duffy <jb_duffy@btinternet.com>
Cc: Arto Bendiken <arto@bendiken.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agobtrfs: qgroup: Fix a regression in qgroup reserved space.
Qu Wenruo [Mon, 3 Aug 2015 06:44:29 +0000 (14:44 +0800)]
btrfs: qgroup: Fix a regression in qgroup reserved space.

During the change to new btrfs extent-oriented qgroup implement, due to
it doesn't use the old __qgroup_excl_accounting() for exclusive extent,
it didn't free the reserved bytes.

The bug will cause limit function go crazy as the reserved space is
never freed, increasing limit will have no effect and still cause
EQOUT.

The fix is easy, just free reserved bytes for newly created exclusive
extent as what it does before.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Yang Dongsheng <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
4 years agodrm/i915: Allow parsing of variable size child device entries from VBT
David Weinehall [Tue, 4 Aug 2015 13:55:52 +0000 (16:55 +0300)]
drm/i915: Allow parsing of variable size child device entries from VBT

VBT version 196 increased the size of common_child_dev_config. The parser
code assumed that the size of this structure would not change.

The modified code now copies the amount needed based on the VBT version,
and emits a debug message if the VBT version is unknown (too new);
since the struct config block won't shrink in newer versions it should
be harmless to copy the maximum known size in such cases, so that's
what we do, but emitting the warning is probably sensible anyway.

In the longer run it might make sense to modify the parser code to
use a version/feature mapping, rather than hardcoding things like this,
but for now the variants are fairly managable.

This fixes a regression introduced in

commit 90e4f1592bb6e82f6690f0e05a8aadcf04d7bce7
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Mar 25 18:45:58 2015 +0200

    drm/i915: Fix the VBT child device parsing for BSW

since we're hitting a DRM_ERROR on older platforms with this.

v2: Stricter size checks

Signed-off-by: David Weinehall <david.weinehall@linux.intel.com>
[danvet: Fixup format string.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
4 years agoMerge remote-tracking branches 'asoc/fix/cs4265', 'asoc/fix/intel' and 'asoc/fix...
Mark Brown [Thu, 6 Aug 2015 11:39:07 +0000 (12:39 +0100)]
Merge remote-tracking branches 'asoc/fix/cs4265', 'asoc/fix/intel' and 'asoc/fix/topology' into asoc-linus

4 years agoMerge remote-tracking branch 'asoc/fix/rt5645' into asoc-linus
Mark Brown [Thu, 6 Aug 2015 11:39:07 +0000 (12:39 +0100)]
Merge remote-tracking branch 'asoc/fix/rt5645' into asoc-linus

4 years agoASoC: topology: Add private data type and bump ABI version to 3
Liam Girdwood [Wed, 5 Aug 2015 13:41:15 +0000 (14:41 +0100)]
ASoC: topology: Add private data type and bump ABI version to 3

Add ID for standalone private data object types and bump ABI version to
3 in order to userpsace features.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: topology: Add ops support to byte controls UAPI
Mengdong Lin [Wed, 5 Aug 2015 13:41:14 +0000 (14:41 +0100)]
ASoC: topology: Add ops support to byte controls UAPI

Add UAPI support for setting byte control ops. Rename the ops structure
to be more generic so it can be sued by other objects too.

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: topology: Update TLV support so we can support more TLV types
Mengdong Lin [Wed, 5 Aug 2015 13:41:13 +0000 (14:41 +0100)]
ASoC: topology: Update TLV support so we can support more TLV types

Currently the TLV topology structure is targeted at only supporting the
DB scale data. This patch extends support for the other TLV types so they
can be easily added at a later stage.

TLV structure is moved to common topology control header since it's a
common field for controls and can be processed in a general way.

Users must set a proper access flag for a control since it's used to
decide if the TLV field is valid and if a TLV callback is needed.

Removed the following fields from topology TLV struct:
- size/count: type can decide the size.
- numid: not needed to initialize TLV for kcontrol.
- data: replaced by the type specific struct.

Added TLV structure to generic control header and removed TLV structure
from mixer control.

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoMerge tag 'asoc-fix-v4.2-rc3' into asoc-fix-topology
Mark Brown [Thu, 6 Aug 2015 11:34:41 +0000 (12:34 +0100)]
Merge tag 'asoc-fix-v4.2-rc3' into asoc-fix-topology

ASoC: Fixes for v4.2

A lot of small fixes here, a few to the core:

 - Fix for binding DAPM stream widgets on devices with prefixes assigned
   to them
 - Minor fixes for the newly added topology interfaces
 - Locking and memory leak fixes for DAPM
 - Driver specific fixes

4 years agoASoC: topology: add private data to manifest
Vinod Koul [Mon, 29 Jun 2015 16:36:46 +0000 (17:36 +0100)]
ASoC: topology: add private data to manifest

The topology file manifest should include a private data field. This
allows vendors to specify vendor data in the manifest, like
timestamps, hashes, additional information for removing platform
configuration out of drivers and making these configurable per platform

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: topology: Add subsequence in topology
Subhransu S. Prusty [Mon, 29 Jun 2015 16:36:44 +0000 (17:36 +0100)]
ASoC: topology: Add subsequence in topology

Some widgets may need sorting within, So add this support in topology.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agovirtio-input: reset device and detach unused during remove
Jason Wang [Thu, 6 Aug 2015 05:54:21 +0000 (13:54 +0800)]
virtio-input: reset device and detach unused during remove

Spec requires a device reset during cleanup, so do it and avoid warn
in virtio core. And detach unused buffers to avoid memory leak.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
4 years agodrm/amdgpu: set fw_version and feature_version for smu fw loading
Jammy Zhou [Tue, 4 Aug 2015 03:44:19 +0000 (11:44 +0800)]
drm/amdgpu: set fw_version and feature_version for smu fw loading

The fw_version and feature_verion should be set correctly when the
firmwares are loaded by SMU on Tonga/Carrzio/Iceland

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
4 years agodrm/amdgpu: add feature version for SDMA ucode
Jammy Zhou [Tue, 4 Aug 2015 02:50:47 +0000 (10:50 +0800)]
drm/amdgpu: add feature version for SDMA ucode

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
4 years agodrm/amdgpu: add feature version for RLC and MEC v2
Jammy Zhou [Tue, 4 Aug 2015 02:43:50 +0000 (10:43 +0800)]
drm/amdgpu: add feature version for RLC and MEC v2

Expose feature version to user space for RLC/MEC/MEC2 ucode as well

v2: fix coding style

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
4 years agodrm/amdgpu: increment queue when iterating on this variable.
Nicolas Iooss [Sat, 1 Aug 2015 13:55:38 +0000 (21:55 +0800)]
drm/amdgpu: increment queue when iterating on this variable.

gfx_v7_0_print_status contains a for loop on variable queue which does
not update this variable between each iteration.  This is bug is
reported by clang while building allmodconfig LLVMLinux on x86_64:

    drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c:5126:19: error: variable
    'queue' used in loop condition not modified in loop body
    [-Werror,-Wloop-analysis]
                for (queue = 0; queue < 8; i++) {
                                ^~~~~

Fix this by incrementing variable queue instead of i in this loop.

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agodrm/amdgpu: fix rb setting for CZ
Alex Deucher [Thu, 9 Jul 2015 02:23:38 +0000 (22:23 -0400)]
drm/amdgpu: fix rb setting for CZ

Always set num_rbs to 2 for CZ.  The 1 RB parts are often harvest
configs.  The will get sorted out in mesa when we program
PA_SC_RASTER_CONFIG[_1].

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agoInput: twl4030-vibra - fix ERROR: Bad of_node_put() warning
Marek Belisko [Wed, 29 Jul 2015 21:02:19 +0000 (14:02 -0700)]
Input: twl4030-vibra - fix ERROR: Bad of_node_put() warning

Fix following:
[    8.862274] ERROR: Bad of_node_put() on /ocp/i2c@48070000/twl@48/audio
[    8.869293] CPU: 0 PID: 1003 Comm: modprobe Not tainted 4.2.0-rc2-letux+ #1175
[    8.876922] Hardware name: Generic OMAP36xx (Flattened Device Tree)
[    8.883514] [<c00159e0>] (unwind_backtrace) from [<c0012488>] (show_stack+0x10/0x14)
[    8.891693] [<c0012488>] (show_stack) from [<c05cb810>] (dump_stack+0x78/0x94)
[    8.899322] [<c05cb810>] (dump_stack) from [<c02cfd5c>] (kobject_release+0x68/0x7c)
[    8.907409] [<c02cfd5c>] (kobject_release) from [<bf0040c4>] (twl4030_vibra_probe+0x74/0x188 [twl4030_vibra])
[    8.917877] [<bf0040c4>] (twl4030_vibra_probe [twl4030_vibra]) from [<c03816ac>] (platform_drv_probe+0x48/0x90)
[    8.928497] [<c03816ac>] (platform_drv_probe) from [<c037feb4>] (really_probe+0xd4/0x238)
[    8.937103] [<c037feb4>] (really_probe) from [<c0380160>] (driver_probe_device+0x30/0x48)
[    8.945678] [<c0380160>] (driver_probe_device) from [<c03801e0>] (__driver_attach+0x68/0x8c)
[    8.954589] [<c03801e0>] (__driver_attach) from [<c037ea60>] (bus_for_each_dev+0x50/0x84)
[    8.963226] [<c037ea60>] (bus_for_each_dev) from [<c037f828>] (bus_add_driver+0xcc/0x1e4)
[    8.971832] [<c037f828>] (bus_add_driver) from [<c0380b60>] (driver_register+0x9c/0xe0)
[    8.980255] [<c0380b60>] (driver_register) from [<c00097e0>] (do_one_initcall+0x100/0x1b8)
[    8.988983] [<c00097e0>] (do_one_initcall) from [<c00b8008>] (do_init_module+0x58/0x1c0)
[    8.997497] [<c00b8008>] (do_init_module) from [<c00b8cac>] (SyS_init_module+0x54/0x64)
[    9.005950] [<c00b8cac>] (SyS_init_module) from [<c000ed20>] (ret_fast_syscall+0x0/0x54)
[    9.015838] input: twl4030:vibrator as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:audio/input/input2

node passed to of_find_node_by_name is put inside that function and new node
is returned if found. Free returned node not already freed node.

Signed-off-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
4 years agoMerge tag 'phy-for-4.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon...
Greg Kroah-Hartman [Wed, 5 Aug 2015 17:12:23 +0000 (10:12 -0700)]
Merge tag 'phy-for-4.2-rc6' of git://git./linux/kernel/git/kishon/linux-phy into usb-linus

Kishon writes:

phy: for 4.2-rc6

*) Fix compiler error when sun4i usb phy driver is built as module
*) Fix SATA Lockup issue in dra7 SoC

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
4 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Wed, 5 Aug 2015 15:50:38 +0000 (18:50 +0300)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "Just two very small & simple patches"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: MTRR: Use default type for non-MTRR-covered gfn before WARN_ON
  KVM: s390: Fix hang VCPU hang/loop regression

4 years agohwmon: (g762) Export OF module alias information
Javier Martinez Canillas [Thu, 30 Jul 2015 16:18:43 +0000 (18:18 +0200)]
hwmon: (g762) Export OF module alias information

The I2C core always reports the MODALIAS uevent as "i2c:<client name"
regardless if the driver was matched using the I2C id_table or the
of_match_table. So technically there's no need for a driver to export
the OF table since currently it's not used.

In fact, the I2C device ID table is mandatory for I2C drivers since
a i2c_device_id is passed to the driver's probe function even if the
I2C core used the OF table to match the driver.

And since the I2C core uses different tables, OF-only drivers needs to
have duplicated data that has to be kept in sync and also the dev node
compatible manufacturer prefix is stripped when reporting the MODALIAS.

To avoid the above, the I2C core behavior may be changed in the future
to not require an I2C device table for OF-only drivers and report the
OF module alias. So, it's better to also export the OF table to prevent
breaking module autoloading if that happens.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
4 years agohwmon: (nct7904) Export I2C module alias information
Javier Martinez Canillas [Thu, 30 Jul 2015 16:18:39 +0000 (18:18 +0200)]
hwmon: (nct7904) Export I2C module alias information

The I2C core always reports the MODALIAS uevent as "i2c:<client name"
regardless if the driver was matched using the I2C id_table or the
of_match_table. So the driver needs to export the I2C table and this
be built into the module or udev won't have the necessary information
to auto load the correct module when the device is added.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Cc: stable@vger.kernel.org # v4.1+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
4 years agohwmon: (dell-smm) Blacklist Dell Studio XPS 8100
Pali Rohár [Thu, 30 Jul 2015 18:41:57 +0000 (20:41 +0200)]
hwmon: (dell-smm) Blacklist Dell Studio XPS 8100

CPU fan speed going up and down on Dell Studio XPS 8100 for
unknown reasons. Without further debugging on the affected
machine, it is not possible to find the problem.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=100121
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Jan C Peters <jcpeters89@gmail.com>
Cc: stable@vger.kernel.org # v4.0+, will need backport
[groeck: cleaned up description, comments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
4 years agoALSA: hda - one Dell machine needs the headphone white noise fixup
Hui Wang [Wed, 5 Aug 2015 10:03:34 +0000 (18:03 +0800)]
ALSA: hda - one Dell machine needs the headphone white noise fixup

The fixup ALC292_FIXUP_DISABLE_AAMIX can fix the white noise of
the headphone on this Dell machine.

Cc: <stable@vger.kernel.org>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoKVM: MTRR: Use default type for non-MTRR-covered gfn before WARN_ON
Alex Williamson [Tue, 4 Aug 2015 16:58:26 +0000 (10:58 -0600)]
KVM: MTRR: Use default type for non-MTRR-covered gfn before WARN_ON

The patch was munged on commit to re-order these tests resulting in
excessive warnings when trying to do device assignment.  Return to
original ordering: https://lkml.org/lkml/2015/7/15/769

Fixes: 3e5d2fdceda1 ("KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
4 years agodrm/i2c: tda998x: fix bad checksum of the HDMI AVI infoframe
Jean-Francois Moine [Fri, 17 Jul 2015 11:07:35 +0000 (13:07 +0200)]
drm/i2c: tda998x: fix bad checksum of the HDMI AVI infoframe

The commit 8c7a075da9f7980cc95ffcd7e6621d4a87f20f40
"drm/i2c: tda998x: use drm_hdmi_avi_infoframe_from_display_mode()"
also uses hdmi_avi_infoframe_pack() to create the AVI infoframe.
This function sets the checksum of the frame and this breaks
the second calculation of the checksum done in tda998x_write_if().

Fixes: 8c7a075da9f7980c ("drm/i2c: tda998x: use drm_hdmi_avi_infoframe_from_display_mode()")
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
4 years agoMIPS: Make set_pte() SMP safe.
David Daney [Tue, 4 Aug 2015 00:48:43 +0000 (17:48 -0700)]
MIPS: Make set_pte() SMP safe.

On MIPS the GLOBAL bit of the PTE must have the same value in any
aligned pair of PTEs.  These pairs of PTEs are referred to as
"buddies".  In a SMP system is is possible for two CPUs to be calling
set_pte() on adjacent PTEs at the same time.  There is a race between
setting the PTE and a different CPU setting the GLOBAL bit in its
buddy PTE.

This race can be observed when multiple CPUs are executing
vmap()/vfree() at the same time.

Make setting the buddy PTE's GLOBAL bit an atomic operation to close
the race condition.

The case of CONFIG_64BIT_PHYS_ADDR && CONFIG_CPU_MIPS32 is *not*
handled.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: <stable@vger.kernel.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10835/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
4 years agoMerge tag 'md/4.2-rc5-fixes' of git://neil.brown.name/md
Linus Torvalds [Wed, 5 Aug 2015 09:02:42 +0000 (11:02 +0200)]
Merge tag 'md/4.2-rc5-fixes' of git://neil.brown.name/md

Pull md fixes from Neil Brown:
 "Three more fixes for md in 4.2

  Mostly corner-case stuff.

  One of these patches is for a CVE: CVE-2015-5697

  I'm not convinced it is serious (data leak from CAP_SYS_ADMIN ioctl)
  but as people seem to want to back-port it, I've included a minimal
  version here.  The remainder of that patch from Benjamin is
  code-cleanup and will arrive in the 4.3 merge window"

* tag 'md/4.2-rc5-fixes' of git://neil.brown.name/md:
  md/raid5: don't let shrink_slab shrink too far.
  md: use kzalloc() when bitmap is disabled
  md/raid1: extend spinlock to protect raid1_end_read_request against inconsistencies

4 years agoMerge branch 'for-4.2' of git://linux-nfs.org/~bfields/linux
Linus Torvalds [Wed, 5 Aug 2015 08:59:59 +0000 (10:59 +0200)]
Merge branch 'for-4.2' of git://linux-nfs.org/~bfields/linux

Pull nfsd fixes from Bruce Fields.

* 'for-4.2' of git://linux-nfs.org/~bfields/linux:
  nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid
  nfsd: Fix a file leak on nfsd4_layout_setlease failure
  nfsd: Drop BUG_ON and ignore SECLABEL on absent filesystem

4 years agomm, vmscan: Do not wait for page writeback for GFP_NOFS allocations
Michal Hocko [Tue, 4 Aug 2015 21:36:58 +0000 (14:36 -0700)]
mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations

Nikolay has reported a hang when a memcg reclaim got stuck with the
following backtrace:

PID: 18308  TASK: ffff883d7c9b0a30  CPU: 1   COMMAND: "rsync"
  #0 __schedule at ffffffff815ab152
  #1 schedule at ffffffff815ab76e
  #2 schedule_timeout at ffffffff815ae5e5
  #3 io_schedule_timeout at ffffffff815aad6a
  #4 bit_wait_io at ffffffff815abfc6
  #5 __wait_on_bit at ffffffff815abda5
  #6 wait_on_page_bit at ffffffff8111fd4f
  #7 shrink_page_list at ffffffff81135445
  #8 shrink_inactive_list at ffffffff81135845
  #9 shrink_lruvec at ffffffff81135ead
 #10 shrink_zone at ffffffff811360c3
 #11 shrink_zones at ffffffff81136eff
 #12 do_try_to_free_pages at ffffffff8113712f
 #13 try_to_free_mem_cgroup_pages at ffffffff811372be
 #14 try_charge at ffffffff81189423
 #15 mem_cgroup_try_charge at ffffffff8118c6f5
 #16 __add_to_page_cache_locked at ffffffff8112137d
 #17 add_to_page_cache_lru at ffffffff81121618
 #18 pagecache_get_page at ffffffff8112170b
 #19 grow_dev_page at ffffffff811c8297
 #20 __getblk_slow at ffffffff811c91d6
 #21 __getblk_gfp at ffffffff811c92c1
 #22 ext4_ext_grow_indepth at ffffffff8124565c
 #23 ext4_ext_create_new_leaf at ffffffff81246ca8
 #24 ext4_ext_insert_extent at ffffffff81246f09
 #25 ext4_ext_map_blocks at ffffffff8124a848
 #26 ext4_map_blocks at ffffffff8121a5b7
 #27 mpage_map_one_extent at ffffffff8121b1fa
 #28 mpage_map_and_submit_extent at ffffffff8121f07b
 #29 ext4_writepages at ffffffff8121f6d5
 #30 do_writepages at ffffffff8112c490
 #31 __filemap_fdatawrite_range at ffffffff81120199
 #32 filemap_flush at ffffffff8112041c
 #33 ext4_alloc_da_blocks at ffffffff81219da1
 #34 ext4_rename at ffffffff81229b91
 #35 ext4_rename2 at ffffffff81229e32
 #36 vfs_rename at ffffffff811a08a5
 #37 SYSC_renameat2 at ffffffff811a3ffc
 #38 sys_renameat2 at ffffffff811a408e
 #39 sys_rename at ffffffff8119e51e
 #40 system_call_fastpath at ffffffff815afa89

Dave Chinner has properly pointed out that this is a deadlock in the
reclaim code because ext4 doesn't submit pages which are marked by
PG_writeback right away.

The heuristic was introduced by commit e62e384e9da8 ("memcg: prevent OOM
with too many dirty pages") and it was applied only when may_enter_fs
was specified.  The code has been changed by c3b94f44fcb0 ("memcg:
further prevent OOM with too many dirty pages") which has removed the
__GFP_FS restriction with a reasoning that we do not get into the fs
code.  But this is not sufficient apparently because the fs doesn't
necessarily submit pages marked PG_writeback for IO right away.

ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily
submit the bio.  Instead it tries to map more pages into the bio and
mpage_map_one_extent might trigger memcg charge which might end up
waiting on a page which is marked PG_writeback but hasn't been submitted
yet so we would end up waiting for something that never finishes.

Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2)
before we go to wait on the writeback.  The page fault path, which is
the only path that triggers memcg oom killer since 3.12, shouldn't
require GFP_NOFS and so we shouldn't reintroduce the premature OOM
killer issue which was originally addressed by the heuristic.

As per David Chinner the xfs is doing similar thing since 2.6.15 already
so ext4 is not the only affected filesystem.  Moreover he notes:

: For example: IO completion might require unwritten extent conversion
: which executes filesystem transactions and GFP_NOFS allocations. The
: writeback flag on the pages can not be cleared until unwritten
: extent conversion completes. Hence memory reclaim cannot wait on
: page writeback to complete in GFP_NOFS context because it is not
: safe to do so, memcg reclaim or otherwise.

Cc: stable@vger.kernel.org # 3.9+
[tytso@mit.edu: corrected the control flow]
Fixes: c3b94f44fcb0 ("memcg: further prevent OOM with too many dirty pages")
Reported-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoARC: Make pt_regs regs unsigned
Vineet Gupta [Wed, 5 Aug 2015 05:42:00 +0000 (11:12 +0530)]
ARC: Make pt_regs regs unsigned

KGDB fails to build after f51e2f191112 ("ARC: make sure instruction_pointer()
returns unsigned value")

The hack to force one specific reg to unsigned backfired. There's no
reason to keep the regs signed after all.

|  CC      arch/arc/kernel/kgdb.o
|../arch/arc/kernel/kgdb.c: In function 'kgdb_trap':
| ../arch/arc/kernel/kgdb.c:180:29: error: lvalue required as left operand of assignment
|   instruction_pointer(regs) -= BREAK_INSTR_SIZE;

Reported-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Fixes: f51e2f191112 ("ARC: make sure instruction_pointer() returns unsigned value")
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoALSA: fireworks/firewire-lib: add support for recent firmware quirk
Takashi Sakamoto [Wed, 5 Aug 2015 00:21:05 +0000 (09:21 +0900)]
ALSA: fireworks/firewire-lib: add support for recent firmware quirk

Fireworks uses TSB43CB43(IceLynx-Micro) as its IEC 61883-1/6 interface.
This chip includes ARM7 core, and loads and runs program. The firmware
is stored in on-board memory and loaded every powering-on from it.

Echo Audio ships several versions of firmwares for each model. These
firmwares have each quirk and the quirk changes a sequence of packets.

As long as I investigated, AudioFire2/AudioFire4/AudioFirePre8 have a
quirk to transfer a first packet with 0x02 in its dbc field. This causes
ALSA Fireworks driver to detect discontinuity. In this case, firmware
version 5.7.0, 5.7.3 and 5.8.0 are used.

Payload  CIP      CIP
quadlets header1  header2
02       00050002 90ffffff <-
42       0005000a 90013000
42       00050012 90014400
42       0005001a 90015800
02       0005001a 90ffffff
42       00050022 90019000
42       0005002a 9001a400
42       00050032 9001b800
02       00050032 90ffffff
42       0005003a 9001d000
42       00050042 9001e400
42       0005004a 9001f800
02       0005004a 90ffffff
(AudioFire2 with firmware version 5.7.)

$ dmesg
snd-fireworks fw1.0: Detect discontinuity of CIP: 00 02

These models, AudioFire8 (since Jul 2009 ) and Gibson Robot Interface
Pack series uses the same ARM binary as their firmware. Thus, this
quirk may be observed among them.

This commit adds a new member for AMDTP structure. This member represents
the value of dbc field in a first AMDTP packet. Drivers can set it with
a preferred value according to model's quirk.

Tested-by: Johannes Oertei <johannes.oertel@uni-due.de>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoRevert "ALSA: fireworks: add support for AudioFire2 quirk"
Takashi Sakamoto [Wed, 5 Aug 2015 00:21:04 +0000 (09:21 +0900)]
Revert "ALSA: fireworks: add support for AudioFire2 quirk"

This reverts commit 9c6893e0be38b6ca9a56a854226e51dee0a16a5a.

The fix is superseded by the next commit as a better implementation
for supporting AudioFire2/AudioFire4/AudioFirePre8 quirks.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agostaging: lustre: Include unaligned.h instead of access_ok.h
Guenter Roeck [Sat, 1 Aug 2015 14:01:24 +0000 (07:01 -0700)]
staging: lustre: Include unaligned.h instead of access_ok.h

Including access_ok.h causes the ia64:allmodconfig build (and maybe others)
to fail with

include/linux/unaligned/le_struct.h:6:19: error:
redefinition of 'get_unaligned_le16'
include/linux/unaligned/access_ok.h:7:19: note:
previous definition of 'get_unaligned_le16' was here
include/linux/unaligned/le_struct.h:26:20: error:
redefinition of 'put_unaligned_le32'
include/linux/unaligned/access_ok.h:42:20: note:
previous definition of 'put_unaligned_le32' was here
include/linux/unaligned/le_struct.h:31:20: error:
redefinition of 'put_unaligned_le64'
include/linux/unaligned/access_ok.h:47:20: note:
previous definition of 'put_unaligned_le64' was here

Include unaligned.h instead and leave it up to the architecture to decide
how to implement unaligned accesses.

Fixes: 8c4f136497315 ("Staging: lustre: Use put_unaligned_le64")
Cc: Vaishali Thakkar <vthakkar1994@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoMerge tag 'pci-v4.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Linus Torvalds [Tue, 4 Aug 2015 16:27:19 +0000 (09:27 -0700)]
Merge tag 'pci-v4.2-fixes-1' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fix from Bjorn Helgaas:
 "This is a trivial fix for a change that broke user program compilation
  (QEMU in this case)"

* tag 'pci-v4.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition

4 years agoMerge tag 'topic/mst-fixes-2015-08-04' of git://anongit.freedesktop.org/drm-intel
Linus Torvalds [Tue, 4 Aug 2015 15:51:06 +0000 (08:51 -0700)]
Merge tag 'topic/mst-fixes-2015-08-04' of git://anongit.freedesktop.org/drm-intel

Pull drm mst fixes from Daniel Vetter:
 "Special pull request for mst fixes since most of the patches touch
  code outside of i915 proper.  DRM parts have also been reviewed by
  Thierry (nvidia) since Dave's enjoying vacations"

* tag 'topic/mst-fixes-2015-08-04' of git://anongit.freedesktop.org/drm-intel:
  drm/atomic-helpers: Make encoder picking more robust
  drm/dp-mst: Remove debug WARN_ON
  drm/i915: Fixup dp mst encoder selection
  drm/atomic-helper: Add an atomice best_encoder callback

4 years agoMerge tag 'for-linus-4.2-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Tue, 4 Aug 2015 15:49:08 +0000 (08:49 -0700)]
Merge tag 'for-linus-4.2-rc5-tag' of git://git./linux/kernel/git/xen/tip

Pull xen bug fixes from David Vrabel:

 - don't lose interrupts when offlining CPUs

 - fix gntdev oops during unmap

 - drop the balloon lock occasionally to allow domain create/destroy

* tag 'for-linus-4.2-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/events/fifo: Handle linked events when closing a port
  xen: release lock occasionally during ballooning
  xen/gntdevt: Fix race condition in gntdev_release()

4 years agoASoC: topology: fix typo in soc_tplg_kcontrol_bind_io()
Mengdong Lin [Tue, 4 Aug 2015 14:47:35 +0000 (15:47 +0100)]
ASoC: topology: fix typo in soc_tplg_kcontrol_bind_io()

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY
Roger Quadros [Fri, 17 Jul 2015 13:47:23 +0000 (16:47 +0300)]
ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY

This register is required to be passed to the SATA PHY driver
to workaround errata i783 (SATA Lockup After SATA DPLL Unlock/Relock).

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
4 years agoxen/events/fifo: Handle linked events when closing a port
Ross Lagerwall [Fri, 31 Jul 2015 13:30:42 +0000 (14:30 +0100)]
xen/events/fifo: Handle linked events when closing a port

An event channel bound to a CPU that was offlined may still be linked
on that CPU's queue.  If this event channel is closed and reused,
subsequent events will be lost because the event channel is never
unlinked and thus cannot be linked onto the correct queue.

When a channel is closed and the event is still linked into a queue,
ensure that it is unlinked before completing.

If the CPU to which the event channel bound is online, spin until the
event is handled by that CPU. If that CPU is offline, it can't handle
the event, so clear the event queue during the close, dropping the
events.

This fixes the missing interrupts (and subsequent disk stalls etc.)
when offlining a CPU.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
4 years agoMerge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Linus Torvalds [Tue, 4 Aug 2015 13:57:32 +0000 (06:57 -0700)]
Merge branch 'rc-fixes' of git://git./linux/kernel/git/mmarek/kbuild

Pull kbuild fixes from Michal Marek:
 "Two fixes for kbuild:

   - The new ARCH_{CPP,A,C}FLAGS variables are reset before including
     the arch Makefile

   - Fix calling make modules_install twice when module compression is
     enabled"

* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  Makefile: Force gzip and xz on module install
  kbuild: Do not pick up ARCH_{CPP,A,C}FLAGS from the environment

4 years agodrm/atomic-helpers: Make encoder picking more robust
Daniel Vetter [Mon, 3 Aug 2015 15:24:11 +0000 (17:24 +0200)]
drm/atomic-helpers: Make encoder picking more robust

We've had a few issues with atomic where subtle bugs in the encoder
picking logic lead to accidental self-stealing of the encoder,
resulting in a NULL connector_state->crtc in update_connector_routing
and subsequent.

Linus applied some duct-tape for an mst regression in

commit 27667f4744fc5a0f3e50910e78740bac5670d18b
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed Jul 29 22:18:16 2015 -0700

    i915: temporary fix for DP MST docking station NULL pointer dereference

But that was incomplete (the code will still oops when debuggin is
enabled) and mangled the state even further. So instead WARN and bail
out as the more future-proof option.

Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
4 years agodrm/dp-mst: Remove debug WARN_ON
Daniel Vetter [Mon, 3 Aug 2015 15:24:10 +0000 (17:24 +0200)]
drm/dp-mst: Remove debug WARN_ON

Apparently been in there since forever and fairly easy to hit when
hotplugging really fast. I can do that since my mst hub has a manual
button to flick the hpd line for reprobing. The resulting WARNING spam
isn't pretty.

Cc: Dave Airlie <airlied@gmail.com>
Cc: stable@vger.kernel.org
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
4 years agodrm/i915: Fixup dp mst encoder selection
Daniel Vetter [Mon, 3 Aug 2015 15:24:09 +0000 (17:24 +0200)]
drm/i915: Fixup dp mst encoder selection

In

commit 8c7b5ccb729870e606321b3703e2c2e698c49a95
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Date:   Tue Apr 21 17:13:19 2015 +0300

    drm/i915: Use atomic helpers for computing changed flags

we've switched over to the atomic version to compute the
crtc->encoder->connector routing from the i915 variant. That one
relies upon the ->best_encoder callback, but the i915-private version
relied upon intel_find_encoder. Which didn't matter except for dp mst,
where the encoder depends upon the selected crtc.

Fix this functional bug by implemented a correct atomic-state based
encoder selector for dp mst.

Note that we can't get rid of the legacy best_encoder callback since
the fbdev emulation uses that still. That means it's incorrect there
still, but that's been the case ever since i915 dp mst support was
merged so not a regression. Best to fix that by converting fbdev over
to atomic too.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
4 years agodrm/atomic-helper: Add an atomice best_encoder callback
Daniel Vetter [Mon, 3 Aug 2015 15:24:08 +0000 (17:24 +0200)]
drm/atomic-helper: Add an atomice best_encoder callback

With legacy helpers all the routing was already set up when calling
best_encoder and so could be inspected. But with atomic it's staged,
hence we need a new atomic compliant callback for drivers which need
to inspect the requested state and can't just decided the best encoder
statically.

This is needed to fix up i915 dp mst where we need to pick the right
encoder depending upon the requested CRTC for the connector.

v2: Don't forget to amend the kerneldoc

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
4 years agoALSA: HDA: Dont check return for snd_hdac_chip_readl
Jeeja KP [Tue, 4 Aug 2015 03:58:39 +0000 (09:28 +0530)]
ALSA: HDA: Dont check return for snd_hdac_chip_readl

The snd_hdac_chip_readl return can never be less than zeros,
so no point in checking for the return value

This fixes following static checker warnings in
snd_hdac_ext_bus_parse_capabilities

       sound/hda/ext/hdac_ext_controller.c:47
 snd_hdac_ext_bus_parse_capabilities()
       warn: unsigned 'offset' is never less than zero.

       sound/hda/ext/hdac_ext_controller.c:54
 snd_hdac_ext_bus_parse_capabilities()
       warn: unsigned 'cur_cap' is never less than zero.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoALSA: HDA: Fix stream assignment for host in decoupled mode
Jeeja KP [Tue, 4 Aug 2015 03:58:38 +0000 (09:28 +0530)]
ALSA: HDA: Fix stream assignment for host in decoupled mode

This fixes issue in assigning host stream in case of
decoupled mode. The check to verify if the stream is already
in use was wrong so fix that

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoARCv2: spinlock/rwlock: Reset retry delay when starting a new spin-wait cycle
Vineet Gupta [Tue, 21 Jul 2015 15:46:53 +0000 (18:46 +0300)]
ARCv2: spinlock/rwlock: Reset retry delay when starting a new spin-wait cycle

The previous commit for delayed retry of SCOND needs some fine tuning
for spin locks.

The backoff from delayed retry in conjunction with spin looping of lock
itself can potentially cause the delay counter to reach high values.
So to provide fairness to any lock operation, after a lock "seems"
available (i.e. just before first SCOND try0, reset the delay counter
back to starting value of 1

Essentially reset delay to 1 for a new spin-wait-loop-acquire cycle.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff
Vineet Gupta [Tue, 14 Jul 2015 14:20:18 +0000 (19:50 +0530)]
ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff

This is to workaround the llock/scond livelock

HS38x4 could get into a LLOCK/SCOND livelock in case of multiple overlapping
coherency transactions in the SCU. The exclusive line state keeps rotating
among contenting cores leading to a never ending cycle. So break the cycle
by deferring the retry of failed exclusive access (SCOND). The actual delay
needed is function of number of contending cores as well as the unrelated
coherency traffic from other cores. To keep the code simple, start off with
small delay of 1 which would suffice most cases and in case of contention
double the delay. Eventually the delay is sufficient such that the coherency
pipeline is drained, thus a subsequent exclusive access would succeed.

Link: http://lkml.kernel.org/r/1438612568-28265-1-git-send-email-vgupta@synopsys.com
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoARC: LLOCK/SCOND based rwlock
Vineet Gupta [Thu, 16 Jul 2015 05:01:45 +0000 (10:31 +0530)]
ARC: LLOCK/SCOND based rwlock

With LLOCK/SCOND, the rwlock counter can be atomically updated w/o need
for a guarding spin lock.

This in turn elides the EXchange instruction based spinning which causes
the cacheline transition to exclusive state and concurrent spinning
across cores would cause the line to keep bouncing around.
LLOCK/SCOND based implementation is superior as spinning on LLOCK keeps
the cacheline in shared state.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoARC: LLOCK/SCOND based spin_lock
Vineet Gupta [Tue, 14 Jul 2015 12:25:05 +0000 (17:55 +0530)]
ARC: LLOCK/SCOND based spin_lock

Current spin_lock uses EXchange instruction to implement the atomic test
and set of lock location (reads orig value and ST 1). This however forces
the cacheline into exclusive state (because of the ST) and concurrent
loops in multiple cores will bounce the line around between cores.

Instead, use LLOCK/SCOND to implement the atomic test and set which is
better as line is in shared state while lock is spinning on LLOCK

The real motivation of this change however is to make way for future
changes in atomics to implement delayed retry (with backoff).
Initial experiment with delayed retry in atomics combined with orig
EX based spinlock was a total disaster (broke even LMBench) as
struct sock has a cache line sharing an atomic_t and spinlock. The
tight spinning on lock, caused the atomic retry to keep backing off
such that it would never finish.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoARC: refactor atomic inline asm operands with symbolic names
Vineet Gupta [Tue, 21 Jul 2015 09:05:42 +0000 (12:05 +0300)]
ARC: refactor atomic inline asm operands with symbolic names

This reduces the diff in forth-coming patches and also helps understand
better the incremental changes to inline asm.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoRevert "ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock"
Vineet Gupta [Wed, 29 Jul 2015 13:50:58 +0000 (19:20 +0530)]
Revert "ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock"

Extended testing of quad core configuration revealed that this fix was
insufficient. Specifically LTP open posix shm_op/23-1 would cause the
hardware livelock in llock/scond loop in update_cpu_load_active()

So remove this and make way for a proper workaround

This reverts commit a5c8b52abe677977883655166796f167ef1e0084.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agoARCv2: [axs103_smp] Reduce clk for Quad FPGA configs
Vineet Gupta [Mon, 3 Aug 2015 12:57:56 +0000 (18:27 +0530)]
ARCv2: [axs103_smp] Reduce clk for Quad FPGA configs

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
4 years agodm: fix dm_merge_bvec regression on 32 bit systems
Mike Snitzer [Mon, 3 Aug 2015 13:54:58 +0000 (09:54 -0400)]
dm: fix dm_merge_bvec regression on 32 bit systems

A DM regression on 32 bit systems was reported against v4.2-rc3 here:
https://lkml.org/lkml/2015/7/29/401

Fix this by reverting both commit 1c220c69 ("dm: fix casting bug in
dm_merge_bvec()") and 148e51ba ("dm: improve documentation and code
clarity in dm_merge_bvec").  This combined revert is done to eliminate
the possibility of a partial revert in stable@ kernels.

In hindsight the correct fix, at the time 1c220c69 was applied to fix
the regression that 148e51ba introduced, should've been to simply revert
148e51ba.

Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
Tested-by: Adam Williamson <awilliam@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.19+
4 years agostaging: vt6655: vnt_bss_info_changed check conf->beacon_rate is not NULL
Malcolm Priestley [Sun, 2 Aug 2015 11:34:46 +0000 (12:34 +0100)]
staging: vt6655: vnt_bss_info_changed check conf->beacon_rate is not NULL

conf->beacon_rate can be NULL on association. So check conf->beacon_rate

BSS_CHANGED_BEACON_INFO needs to flagged in changed as the beacon_rate
will appear later.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: <stable@vger.kernel.org> # v3.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 years agoMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Mon, 3 Aug 2015 21:51:30 +0000 (14:51 -0700)]
Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "A refcounting bugfix for the i2c-core, bugfixes for the generic bus
  recovery algorithm and for its omap-user, making binary file
  attributes for EEPROMs behave POSIX compliant, and a small typo fix
  while we are here"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: fix leaked device refcount on of_find_i2c_* error path
  i2c: Fix typo in i2c-bfin-twi.c
  i2c: omap: fix bus recovery setup
  i2c: core: only use set_scl for bus recovery after calling prepare_recovery
  misc: eeprom: at24: clean up at24_bin_write()
  i2c: slave eeprom: clean up sysfs bin attribute read()/write()