tree 2bac5b05aa0f248b82facc0f2bc0bf705e306e05
parent bfac7009180901f57f20a73c53c3e57b1ce75a1b
author Oleg Nesterov <oleg@redhat.com> 1276211418 +0200
committer Ingo Molnar <mingo@elte.hu> 1276850817 +0200

sched: run_posix_cpu_timers: Don't check ->exit_state, use lock_task_sighand()

run_posix_cpu_timers() doesn't work if current has already passed
exit_notify(). This was needed to prevent the races with do_wait().

Since ea6d290c ->signal is always valid and can't go away. We can
remove the "tsk->exit_state == 0" in fastpath_timer_check() and
convert run_posix_cpu_timers() to use lock_task_sighand().

Note: it makes sense to take group_leader's sighand instead, the
sub-thread still uses CPU after release_task(). But we need more
changes to do this.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100610231018.GA25942@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>