Messages in this thread | | | Date | Tue, 14 Jan 2014 11:18:23 -0800 | From | John Stultz <> | Subject | Re: [tip:core/urgent] sched_clock: Disable seqlock lockdep usage in sched_clock() |
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On 01/12/2014 10:42 AM, tip-bot for John Stultz wrote: > Commit-ID: 7a06c41cbec33c6dbe7eec575c61986122617408 > Gitweb: http://git.kernel.org/tip/7a06c41cbec33c6dbe7eec575c61986122617408 > Author: John Stultz <john.stultz@linaro.org> > AuthorDate: Thu, 2 Jan 2014 15:11:14 -0800 > Committer: Ingo Molnar <mingo@kernel.org> > CommitDate: Sun, 12 Jan 2014 10:14:00 +0100 > > sched_clock: Disable seqlock lockdep usage in sched_clock() > > Unfortunately the seqlock lockdep enablement can't be used > in sched_clock(), since the lockdep infrastructure eventually > calls into sched_clock(), which causes a deadlock. > > Thus, this patch changes all generic sched_clock() usage > to use the raw_* methods. > > Acked-by: Linus Torvalds <torvalds@linux-foundation.org> > Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> > Reported-by: Krzysztof Hałasa <khalasa@piap.pl> > Signed-off-by: John Stultz <john.stultz@linaro.org> > Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > Cc: Willy Tarreau <w@1wt.eu> > Signed-off-by: Peter Zijlstra <peterz@infradead.org> > Link: http://lkml.kernel.org/r/1388704274-5278-2-git-send-email-john.stultz@linaro.org > Signed-off-by: Ingo Molnar <mingo@kernel.org>
Hey Ingo, Just wanted to follow up here, since I've still not seen this (and the raw_ renaming patch) submitted to Linus. These address a lockup that triggers on ARM systems if lockdep is enabled and it would be good to get it in before 3.13 is out.
thanks -john
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