Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d2ee7198cc2414aade234a3cebc69e6cbff35d9b Commit: d2ee7198cc2414aade234a3cebc69e6cbff35d9b Parent: 7917ff9a4cefd0500aa4a1b1942da96dbce6999f Author: Oleg Nesterov <[EMAIL PROTECTED]> AuthorDate: Tue Oct 16 23:26:47 2007 -0700 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Wed Oct 17 08:42:51 2007 -0700
pi-futex: set PF_EXITING without taking ->pi_lock It is a bit annoying that do_exit() takes ->pi_lock to set PF_EXITING. All we need is to synchronize with lookup_pi_state() which saw this task without PF_EXITING under ->pi_lock. Change do_exit() to use spin_unlock_wait(). Signed-off-by: Oleg Nesterov <[EMAIL PROTECTED]> Acked-by: Ingo Molnar <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- kernel/exit.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/exit.c b/kernel/exit.c index 6ca1e46..3b8dfff 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -931,13 +931,13 @@ fastcall NORET_TYPE void do_exit(long code) schedule(); } + tsk->flags |= PF_EXITING; /* * tsk->flags are checked in the futex code to protect against * an exiting task cleaning up the robust pi futexes. */ - spin_lock_irq(&tsk->pi_lock); - tsk->flags |= PF_EXITING; - spin_unlock_irq(&tsk->pi_lock); + smp_mb(); + spin_unlock_wait(&tsk->pi_lock); if (unlikely(in_atomic())) printk(KERN_INFO "note: %s[%d] exited with preempt_count %d\n", - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html