Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / Documentation / ABI / testing / sysfs-kernel-livepatch
1 What:           /sys/kernel/livepatch
2 Date:           Nov 2014
3 KernelVersion:  3.19.0
4 Contact:        live-patching@vger.kernel.org
5 Description:
6                 Interface for kernel live patching
7
8                 The /sys/kernel/livepatch directory contains subdirectories for
9                 each loaded live patch module.
10
11 What:           /sys/kernel/livepatch/<patch>
12 Date:           Nov 2014
13 KernelVersion:  3.19.0
14 Contact:        live-patching@vger.kernel.org
15 Description:
16                 The patch directory contains subdirectories for each kernel
17                 object (vmlinux or a module) in which it patched functions.
18
19 What:           /sys/kernel/livepatch/<patch>/enabled
20 Date:           Nov 2014
21 KernelVersion:  3.19.0
22 Contact:        live-patching@vger.kernel.org
23 Description:
24                 A writable attribute that indicates whether the patched
25                 code is currently applied.  Writing 0 will disable the patch
26                 while writing 1 will re-enable the patch.
27
28 What:           /sys/kernel/livepatch/<patch>/transition
29 Date:           Feb 2017
30 KernelVersion:  4.12.0
31 Contact:        live-patching@vger.kernel.org
32 Description:
33                 An attribute which indicates whether the patch is currently in
34                 transition.
35
36 What:           /sys/kernel/livepatch/<patch>/force
37 Date:           Nov 2017
38 KernelVersion:  4.15.0
39 Contact:        live-patching@vger.kernel.org
40 Description:
41                 A writable attribute that allows administrator to affect the
42                 course of an existing transition. Writing 1 clears
43                 TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
44                 the patched or unpatched state. Administrator should not
45                 use this feature without a clearance from a patch
46                 distributor. Removal (rmmod) of patch modules is permanently
47                 disabled when the feature is used. See
48                 Documentation/livepatch/livepatch.rst for more information.
49
50 What:           /sys/kernel/livepatch/<patch>/<object>
51 Date:           Nov 2014
52 KernelVersion:  3.19.0
53 Contact:        live-patching@vger.kernel.org
54 Description:
55                 The object directory contains subdirectories for each function
56                 that is patched within the object.
57
58 What:           /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
59 Date:           Nov 2014
60 KernelVersion:  3.19.0
61 Contact:        live-patching@vger.kernel.org
62 Description:
63                 The function directory contains attributes regarding the
64                 properties and state of the patched function.
65
66                 The directory name contains the patched function name and a
67                 sympos number corresponding to the nth occurrence of the symbol
68                 name in kallsyms for the patched object.
69
70                 There are currently no such attributes.