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 <[email protected]>
--- 2.6.17-rc6/kernel/posix-cpu-timers.c~3_ARM 2006-06-15 18:46:00.000000000 +0400
+++ 2.6.17-rc6/kernel/posix-cpu-timers.c 2006-06-15 19:04:54.000000000 +0400
@@ -555,9 +555,6 @@ static void arm_timer(struct k_itimer *t
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);
-
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