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livepatch: Add stack_order sysfs attribute

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Add "stack_order" sysfs attribute which holds the order in which a live
patch module was loaded into the system. A user can then determine an
active live patched version of a function.

cat /sys/kernel/livepatch/livepatch_1/stack_order -> 1

means that livepatch_1 is the first live patch applied

cat /sys/kernel/livepatch/livepatch_module/stack_order -> N

means that livepatch_module is the Nth live patch applied

Suggested-by: Petr Mladek <pmladek@suse.com>
Suggested-by: Miroslav Benes <mbenes@suse.cz>
Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Wardenjohn <zhangwarden@gmail.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lore.kernel.org/r/20241008014856.3729-2-zhangwarden@gmail.com
[pmladek@suse.com: Updated kernel version and date in the ABI documentation.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Wardenjohn
2024-10-08 09:48:56 +08:00
committed by Petr Mladek
parent aa44f41470
commit 3dae09de40
2 changed files with 33 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-kernel-livepatch
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@@ -55,6 +55,15 @@ Description:
An attribute which indicates whether the patch supports
atomic-replace.
What: /sys/kernel/livepatch/<patch>/stack_order
Date: Jan 2025
KernelVersion: 6.14.0
Description:
This attribute specifies the sequence in which live patch modules
are applied to the system. If multiple live patches modify the same
function, the implementation with the biggest 'stack_order' number
is used, unless a transition is currently in progress.
What: /sys/kernel/livepatch/<patch>/<object>
Date: Nov 2014
KernelVersion: 3.19.0