Merge tag 'nfs-for-4.12-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

[sfrench/cifs-2.6.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 17156d66b1241a82db3b529ad4fd1bc3c4393471..238bd211f36576efacd83bf2104aa8002825b92e 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -531,7 +531,6 @@
                        [ACPI] acpi_pm
                        [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2,
                                pxa_timer,timer3,32k_counter,timer0_1
-                       [AVR32] avr32
                        [X86-32] pit,hpet,tsc;
                                scx200_hrt on Geode; cyclone on IBM x440
                        [MIPS] MIPS
@@ -989,6 +988,7 @@
                        earlyprintk=ttySn[,baudrate]
                        earlyprintk=dbgp[debugController#]
                        earlyprintk=pciserial,bus:device.function[,baudrate]
+                       earlyprintk=xdbc[xhciController#]
 
                        earlyprintk is useful when the kernel crashes before
                        the normal console is initialized. It is not enabled by
@@ -1578,6 +1578,15 @@
                        extended tables themselves, and also PASID support. With
                        this option set, extended tables will not be used even
                        on hardware which claims to support them.
+               tboot_noforce [Default Off]
+                       Do not force the Intel IOMMU enabled under tboot.
+                       By default, tboot will force Intel IOMMU on, which
+                       could harm performance of some high-throughput
+                       devices like 40GBit network cards, even if identity
+                       mapping is enabled.
+                       Note that using this option lowers the security
+                       provided by tboot because it makes the system
+                       vulnerable to DMA attacks.
 
        intel_idle.max_cstate=  [KNL,HW,ACPI,X86]
                        0       disables intel_idle and fall back on acpi_idle.
@@ -1644,6 +1653,12 @@
                nobypass        [PPC/POWERNV]
                        Disable IOMMU bypass, using IOMMU for PCI devices.
 
+       iommu.passthrough=
+                       [ARM64] Configure DMA to bypass the IOMMU by default.
+                       Format: { "0" | "1" }
+                       0 - Use IOMMU translation for DMA.
+                       1 - Bypass the IOMMU for DMA.
+                       unset - Use IOMMU translation for DMA.
 
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in
@@ -2419,7 +2434,7 @@
                        and gids from such clients.  This is intended to ease
                        migration from NFSv2/v3.
 
-       nmi_debug=      [KNL,AVR32,SH] Specify one or more actions to take
+       nmi_debug=      [KNL,SH] Specify one or more actions to take
                        when a NMI is triggered.
                        Format: [state][,regs][,debounce][,die]
 
@@ -3172,6 +3187,12 @@
        ramdisk_size=   [RAM] Sizes of RAM disks in kilobytes
                        See Documentation/blockdev/ramdisk.txt.
 
+       ras=option[,option,...] [KNL] RAS-specific options
+
+               cec_disable     [X86]
+                               Disable the Correctable Errors Collector,
+                               see CONFIG_RAS_CEC help text.
+
        rcu_nocbs=      [KNL]
                        The argument is a cpu list, as described above.
 
@@ -3773,6 +3794,14 @@
        spia_pedr=
        spia_peddr=
 
+       srcutree.exp_holdoff [KNL]
+                       Specifies how many nanoseconds must elapse
+                       since the end of the last SRCU grace period for
+                       a given srcu_struct until the next normal SRCU
+                       grace period will be considered for automatic
+                       expediting.  Set to zero to disable automatic
+                       expediting.
+
        stacktrace      [FTRACE]
                        Enabled the stack tracer on boot up.
 
@@ -4115,6 +4144,9 @@
        usbhid.mousepoll=
                        [USBHID] The interval which mice are to be polled at.
 
+       usbhid.jspoll=
+                       [USBHID] The interval which joysticks are to be polled at.
+
        usb-storage.delay_use=
                        [UMS] The delay in seconds before a new device is
                        scanned for Logical Units (default 1).