On Sat, Jan 28, 2012 at 4:03 AM, tip-bot for Yasunori Goto
<y-goto@xxxxxxxxxxxxxx> wrote:
>
> sched: Fix ancient race in do_exit()
Ugh.
It would be much nicer to just clear the rwsem waiter->task thing
*after* waking the task up, which would avoid this race entirely,
afaik.
Tell me, why wouldn't that work? rwsem_down_failed_common() does
/* wait to be given the lock */
for (;;) {
if (!waiter.task)
break;
...
so then we wouldn't need the task refcount crap in rwsem either etc,
and we'd get rid of all races with wakeup.
I wonder why we're clearing that whole waiter->task so early.
Linus
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