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livepatch: Remove signal sysfs attribute

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The fake signal is send automatically now. We can rely on it completely
and remove the sysfs attribute.

Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Miroslav Benes
2019-01-15 17:45:07 +01:00
committed by Jiri Kosina
parent cba82dea30
commit 0b3d52790e
5 changed files with 48 additions and 95 deletions
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16
Documentation/livepatch/livepatch.txt
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@@ -158,13 +158,11 @@ If a patch is in transition, this file shows 0 to indicate the task is
unpatched and 1 to indicate it's patched. Otherwise, if no patch is in
transition, it shows -1. Any tasks which are blocking the transition
can be signaled with SIGSTOP and SIGCONT to force them to change their
patched state. This may be harmful to the system though.
/sys/kernel/livepatch/<patch>/signal attribute provides a better alternative.
Writing 1 to the attribute sends a fake signal to all remaining blocking
tasks. No proper signal is actually delivered (there is no data in signal
pending structures). Tasks are interrupted or woken up, and forced to change
their patched state. Despite the sysfs attribute the fake signal is also sent
every 15 seconds automatically.
patched state. This may be harmful to the system though. Sending a fake signal
to all remaining blocking tasks is a better alternative. No proper signal is
actually delivered (there is no data in signal pending structures). Tasks are
interrupted or woken up, and forced to change their patched state. The fake
signal is automatically sent every 15 seconds.
Administrator can also affect a transition through
/sys/kernel/livepatch/<patch>/force attribute. Writing 1 there clears
@@ -412,8 +410,8 @@ Information about the registered patches can be found under
/sys/kernel/livepatch. The patches could be enabled and disabled
by writing there.
/sys/kernel/livepatch/<patch>/signal and /sys/kernel/livepatch/<patch>/force
attributes allow administrator to affect a patching operation.
/sys/kernel/livepatch/<patch>/force attributes allow administrator to affect a
patching operation.
See Documentation/ABI/testing/sysfs-kernel-livepatch for more details.