linux-kernel - [PATCH 2/2] tracing: send_sigqueue() needs trace_signal

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Message-ID: <20120110174545.GB30810@redhat.com>
Date:	Tue, 10 Jan 2012 18:45:45 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Seiji Aguchi <saguchi@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] tracing: send_sigqueue() needs trace_signal_generate()
	too

Add trace_signal_generate() into send_sigqueue().

send_sigqueue() is very similar to __send_signal(), just it uses
the preallocated info. It should do the same wrt tracing.

Reported-by: Seiji Aguchi <saguchi@...hat.com>
Reviewed-by: Seiji Aguchi <seiji.aguchi@....com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/signal.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 4515114..a6ff776 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1559,7 +1559,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
 	int sig = q->info.si_signo;
 	struct sigpending *pending;
 	unsigned long flags;
-	int ret;
+	int ret, result;
 
 	BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
 
@@ -1568,6 +1568,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
 		goto ret;
 
 	ret = 1; /* the signal is ignored */
+	result = TRACE_SIGNAL_IGNORED;
 	if (!prepare_signal(sig, t, 0))
 		goto out;
 
@@ -1579,6 +1580,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
 		 */
 		BUG_ON(q->info.si_code != SI_TIMER);
 		q->info.si_overrun++;
+		result = TRACE_SIGNAL_ALREADY_PENDING;
 		goto out;
 	}
 	q->info.si_overrun = 0;
@@ -1588,7 +1590,9 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
 	list_add_tail(&q->list, &pending->list);
 	sigaddset(&pending->signal, sig);
 	complete_signal(sig, t, group);
+	result = TRACE_SIGNAL_DELIVERED;
 out:
+	trace_signal_generate(sig, &q->info, t, group, result);
 	unlock_task_sighand(t, &flags);
 ret:
 	return ret;
-- 
1.5.5.1


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