From: Miroslav Benes <mbenes@suse.cz>
To: jpoimboe@redhat.com, jikos@kernel.org, pmladek@suse.com,
joe.lawrence@redhat.com
Cc: live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
axboe@kernel.dk, Miroslav Benes <mbenes@suse.cz>
Subject: [PATCH] livepatch: Replace the fake signal sending with TIF_NOTIFY_SIGNAL infrastructure
Date: Fri, 26 Mar 2021 15:30:21 +0100 [thread overview]
Message-ID: <20210326143021.17773-1-mbenes@suse.cz> (raw)
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 12db8b690010 ("entry: Add support for
TIF_NOTIFY_SIGNAL") added a generic infrastructure to achieve the same.
Replace our bespoke solution with the generic one.
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
---
Tested on x86_64, s390x and ppc64le archs.
kernel/livepatch/transition.c | 5 ++---
kernel/signal.c | 3 +--
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index f6310f848f34..3a4beb9395c4 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -9,6 +9,7 @@
#include <linux/cpu.h>
#include <linux/stacktrace.h>
+#include <linux/tracehook.h>
#include "core.h"
#include "patch.h"
#include "transition.h"
@@ -369,9 +370,7 @@ static void klp_send_signals(void)
* Send fake signal to all non-kthread tasks which are
* still not migrated.
*/
- spin_lock_irq(&task->sighand->siglock);
- signal_wake_up(task, 0);
- spin_unlock_irq(&task->sighand->siglock);
+ set_notify_signal(task);
}
}
read_unlock(&tasklist_lock);
diff --git a/kernel/signal.c b/kernel/signal.c
index f2a1b898da29..e52cb82aaecd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -181,8 +181,7 @@ 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);
}
--
2.30.2
next reply other threads:[~2021-03-26 14:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 14:30 Miroslav Benes [this message]
2021-03-26 23:10 ` [PATCH] livepatch: Replace the fake signal sending with TIF_NOTIFY_SIGNAL infrastructure Jens Axboe
2021-03-29 12:25 ` Petr Mladek
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