From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Mon, 24 Oct 2005 10:36:28 +0000 (+0400)
Subject: [PATCH] posix-timers: exit path cleanup
X-Git-Tag: v2.6.14~28
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ca531a0a5e01e5122f67cb6aca8fcbfc70e18e0b;p=platform%2Fkernel%2Flinux-3.10.git

[PATCH] posix-timers: exit path cleanup

No need to rebalance when task exited

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index ccb0468..92a0380 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -486,6 +486,9 @@ static void process_timer_rebalance(struct task_struct *p,
  	struct task_struct *t = p;
 	unsigned int nthreads = atomic_read(&p->signal->live);
 
+	if (!nthreads)
+		return;
+
 	switch (clock_idx) {
 	default:
 		BUG();
@@ -1160,6 +1163,9 @@ static void check_process_timers(struct task_struct *tsk,
 		unsigned long long sched_left, sched;
 		const unsigned int nthreads = atomic_read(&sig->live);
 
+		if (!nthreads)
+			return;
+
 		prof_left = cputime_sub(prof_expires, utime);
 		prof_left = cputime_sub(prof_left, stime);
 		prof_left = cputime_div(prof_left, nthreads);