[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 (file)
--- 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);