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signals: kill the awful task_rq_unlock_wait() hack

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Now that task->signal can't go away we can revert the horrible hack added
by ad474caca3 ("fix for
account_group_exec_runtime(), make sure ->signal can't be freed under
rq->lock").

And we can do more cleanups sched_stats.h/posix-cpu-timers.c later.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov
2010-05-26 14:43:18 -07:00
committed by Linus Torvalds
parent 4ada856fb0
commit b7b8ff6373
3 changed files with 0 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/exit.c
-5
View File
@@ -145,11 +145,6 @@ static void __exit_signal(struct task_struct *tsk)
if (sig) {
flush_sigqueue(&sig->shared_pending);
taskstats_tgid_free(sig);
/*
* Make sure ->signal can't go away under rq->lock,
* see account_group_exec_runtime().
*/
task_rq_unlock_wait(tsk);
tty_kref_put(tty);
}
}
kernel/sched.c
-8
View File
@@ -969,14 +969,6 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
}
}
void task_rq_unlock_wait(struct task_struct *p)
{
struct rq *rq = task_rq(p);
smp_mb(); /* spin-unlock-wait is not a full memory barrier */
raw_spin_unlock_wait(&rq->lock);
}
static void __task_rq_unlock(struct rq *rq)
__releases(rq->lock)
{