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authorMiroslav Benes <mbenes@suse.cz>2019-01-15 19:45:07 +0300
committerJiri Kosina <jkosina@suse.cz>2019-01-17 00:09:33 +0300
commit0b3d52790e1cfd6b80b826a245d24859e89632f7 (patch)
tree8a804f975eeacddea0add44d9b2ad912a9fbc636 /Documentation/livepatch
parentcba82dea30613346cf9a0532a41fc118bc3263af (diff)
downloadlinux-0b3d52790e1cfd6b80b826a245d24859e89632f7.tar.xz
livepatch: Remove signal sysfs attribute
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>
Diffstat (limited to 'Documentation/livepatch')
-rw-r--r--Documentation/livepatch/livepatch.txt16
1 files changed, 7 insertions, 9 deletions
diff --git a/Documentation/livepatch/livepatch.txt b/Documentation/livepatch/livepatch.txt
index 407e0f03dc99..4627b41ff02e 100644
--- a/Documentation/livepatch/livepatch.txt
+++ b/Documentation/livepatch/livepatch.txt
@@ -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.