linux-kernel - [PATCH] kill_pid_info: kill acquired_tasklist

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Date:	Sat, 16 Dec 2006 23:23:08 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] kill_pid_info: kill acquired_tasklist_lock

Kill acquired_tasklist_lock, sig_needs_tasklist() is very cheap nowadays.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- eric-mm1/kernel/signal.c~3_kpi	2006-12-16 22:22:48.000000000 +0300
+++ eric-mm1/kernel/signal.c	2006-12-16 23:14:05.000000000 +0300
@@ -1247,19 +1247,18 @@ int kill_pgrp_info(int sig, struct sigin
 int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
 {
 	int error;
-	int acquired_tasklist_lock = 0;
 	struct task_struct *p;
 
 	rcu_read_lock();
-	if (unlikely(sig_needs_tasklist(sig))) {
+	if (unlikely(sig_needs_tasklist(sig)))
 		read_lock(&tasklist_lock);
-		acquired_tasklist_lock = 1;
-	}
+
 	p = pid_task(pid, PIDTYPE_PID);
 	error = -ESRCH;
 	if (p)
 		error = group_send_sig_info(sig, info, p);
-	if (unlikely(acquired_tasklist_lock))
+
+	if (unlikely(sig_needs_tasklist(sig)))
 		read_unlock(&tasklist_lock);
 	rcu_read_unlock();
 	return error;

-
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