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[PATCH] arm_timer: remove a racy and obsolete PF_EXITING check 

arm_timer() checks PF_EXITING to prevent BUG_ON(->exit_state)
in run_posix_cpu_timers().

However, for some reason it does so only for CPUCLOCK_PERTHREAD
case (which is imho wrong).

Also, this check is not reliable, PF_EXITING could be set on
another cpu without any locks/barriers just after the check,
so it can't prevent from attaching the timer to the exiting
task.

The previous patch makes this check unneeded.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-06-15 20:12:02 +04:00 committed by Linus Torvalds
parent 30f1e3dd8c
commit f53ae1dc34
1 changed files with 0 additions and 3 deletions
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3
kernel/posix-cpu-timers.c
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@ -555,9 +555,6 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
struct cpu_timer_list *next;
unsigned long i;
if (CPUCLOCK_PERTHREAD(timer->it_clock) && (p->flags & PF_EXITING))
return;
head = (CPUCLOCK_PERTHREAD(timer->it_clock) ?
p->cpu_timers : p->signal->cpu_timers);
head += CPUCLOCK_WHICH(timer->it_clock);