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[PATCH] futex_find_get_task(): don't take tasklist_lock
authorOleg Nesterov <oleg@tv-sign.ru>
Fri, 29 Sep 2006 09:00:55 +0000 (02:00 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Fri, 29 Sep 2006 16:18:18 +0000 (09:18 -0700)
commitd359b549bf3d7f42f0084918a4816ea4572e507c
treea154a9b1913a459bdaed49c623d39f1e73689295tree | snapshot (tar.gz zip)
parent44938af6e08580514abce8bea23ae1c034ea0b1dcommit | diff
[PATCH] futex_find_get_task(): don't take tasklist_lock

It is ok to do find_task_by_pid() + get_task_struct() under
rcu_read_lock(), we cand drop tasklist_lock.

Note that testing of ->exit_state is racy with or without tasklist anyway.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/futex.c diff | blob | blame | history