On Tue, 2011-06-07 at 12:02 +0000, tip-bot for Peter Zijlstra wrote: > Commit-ID: f2513cde93f0957d5dc6c09bc24b0cccd27d8e1d > Gitweb: http://git.kernel.org/tip/f2513cde93f0957d5dc6c09bc24b0cccd27d8e1d > Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> > AuthorDate: Mon, 6 Jun 2011 12:32:43 +0200 > Committer: Ingo Molnar <mingo@xxxxxxx> > CommitDate: Tue, 7 Jun 2011 12:25:50 +0200 > > lockdep: Fix lock_is_held() on recursion > > The main lock_is_held() user is lockdep_assert_held(), avoid false > assertions in lockdep_off() sections by unconditionally reporting the > lock is taken. > > [ the reason this is important is a lockdep_assert_held() in ttwu() > which triggers a warning under lockdep_off() as in printk() which > can trigger another wakeup and lock up due to spinlock > recursion, as reported and heroically debugged by Arne Jansen ] > > Reported-and-tested-by: Arne Jansen <lists@xxxxxxxxxxxxxx> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxx> Not _that_ critical for stable since the offending lockdep_assert_held() doesn't exist in .39, still definitely won't hurt. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|