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livepatch: add /proc/<pid>/patch_state

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Expose the per-task patch state value so users can determine which tasks
are holding up completion of a patching operation.

Signed-off-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Miroslav Benes <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Josh Poimboeuf 2017-02-13 19:42:41 -06:00 • committed by Jiri Kosina
commit 7c23b33001
2 changed files with 33 additions and 0 deletions
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18
Documentation/filesystems/proc.txt
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@ -44,6 +44,7 @@ Table of Contents
3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
3.9 /proc/<pid>/map_files - Information about memory mapped files
3.10 /proc/<pid>/timerslack_ns - Task timerslack value
3.11 /proc/<pid>/patch_state - Livepatch patch operation state
4 Configuring procfs
4.1 Mount options
@ -1887,6 +1888,23 @@ Valid values are from 0 - ULLONG_MAX
An application setting the value must have PTRACE_MODE_ATTACH_FSCREDS level
permissions on the task specified to change its timerslack_ns value.
3.11 /proc/<pid>/patch_state - Livepatch patch operation state
-----------------------------------------------------------------
When CONFIG_LIVEPATCH is enabled, this file displays the value of the
patch state for the task.
A value of '-1' indicates that no patch is in transition.
A value of '0' indicates that a patch is in transition and the task is
unpatched. If the patch is being enabled, then the task hasn't been
patched yet. If the patch is being disabled, then the task has already
been unpatched.
A value of '1' indicates that a patch is in transition and the task is
patched. If the patch is being enabled, then the task has already been
patched. If the patch is being disabled, then the task hasn't been
unpatched yet.
------------------------------------------------------------------------------
Configuring procfs