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livepatch: Replace the fake signal sending with TIF_NOTIFY_SIGNAL infrastructure

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Livepatch sends a fake signal to all remaining blocking tasks of a
running transition after a set period of time. It uses TIF_SIGPENDING
flag for the purpose. Commit 12db8b6900 ("entry: Add support for
TIF_NOTIFY_SIGNAL") added a generic infrastructure to achieve the same.
Replace our bespoke solution with the generic one.

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Miroslav Benes 2021-03-29 15:28:15 +02:00 • committed by Jiri Kosina
parent 54ab35d6bb
commit 8df1947c71
2 changed files with 3 additions and 6 deletions
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4
kernel/signal.c
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@ -43,7 +43,6 @@
#include <linux/cn_proc.h>
#include <linux/compiler.h>
#include <linux/posix-timers.h>
#include <linux/livepatch.h>
#include <linux/cgroup.h>
#include <linux/audit.h>
@ -181,8 +180,7 @@ void recalc_sigpending_and_wake(struct task_struct *t)
void recalc_sigpending(void)
{
if (!recalc_sigpending_tsk(current) && !freezing(current) &&
!klp_patch_pending(current))
if (!recalc_sigpending_tsk(current) && !freezing(current))
clear_thread_flag(TIF_SIGPENDING);
}