On Wed, 2014-07-16 at 12:24 -0700, tip-bot for Peter Zijlstra wrote: > Commit-ID: 4badad352a6bb202ec68afa7a574c0bb961e5ebc > Gitweb: http://git.kernel.org/tip/4badad352a6bb202ec68afa7a574c0bb961e5ebc > Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > AuthorDate: Fri, 6 Jun 2014 19:53:16 +0200 > Committer: Ingo Molnar <mingo@xxxxxxxxxx> > CommitDate: Wed, 16 Jul 2014 14:57:07 +0200 > > locking/mutex: Disable optimistic spinning on some architectures > > The optimistic spin code assumes regular stores and cmpxchg() play nice; > this is found to not be true for at least: parisc, sparc32, tile32, > metag-lock1, arc-!llsc and hexagon. > > There is further wreckage, but this in particular seemed easy to > trigger, so blacklist this. > > Opt in for known good archs. > > Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Reported-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > Cc: David Miller <davem@xxxxxxxxxxxxx> > Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx> > Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> > Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx> > Cc: Jason Low <jason.low2@xxxxxx> > Cc: Waiman Long <waiman.long@xxxxxx> > Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx> > Cc: Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx> > Cc: John David Anglin <dave.anglin@xxxxxxxx> > Cc: James Hogan <james.hogan@xxxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Davidlohr Bueso <davidlohr@xxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > Cc: Russell King <linux@xxxxxxxxxxxxxxxx> > Cc: Will Deacon <will.deacon@xxxxxxx> > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: linuxppc-dev@xxxxxxxxxxxxxxxx > Cc: sparclinux@xxxxxxxxxxxxxxx > Link: http://lkml.kernel.org/r/20140606175316.GV13930@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Cc'ing stable: this issue was reported to begin after commit fb0527bd, so since v3.13. Thanks, Davidlohr -- 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
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