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    SubjectRe: [tip:locking/urgent] locking/mutex: Disable optimistic spinning on some architectures
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    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@infradead.org>
    > AuthorDate: Fri, 6 Jun 2014 19:53:16 +0200
    > Committer: Ingo Molnar <mingo@kernel.org>
    > 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@infradead.org>
    > Reported-by: Mikulas Patocka <mpatocka@redhat.com>
    > Cc: David Miller <davem@davemloft.net>
    > Cc: Chris Metcalf <cmetcalf@tilera.com>
    > Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
    > Cc: Vineet Gupta <vgupta@synopsys.com>
    > Cc: Jason Low <jason.low2@hp.com>
    > Cc: Waiman Long <waiman.long@hp.com>
    > Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
    > Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
    > Cc: John David Anglin <dave.anglin@bell.net>
    > Cc: James Hogan <james.hogan@imgtec.com>
    > Cc: Linus Torvalds <torvalds@linux-foundation.org>
    > Cc: Davidlohr Bueso <davidlohr@hp.com>
    > Cc: stable@vger.kernel.org
    > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    > Cc: Catalin Marinas <catalin.marinas@arm.com>
    > Cc: Russell King <linux@arm.linux.org.uk>
    > Cc: Will Deacon <will.deacon@arm.com>
    > Cc: linux-arm-kernel@lists.infradead.org
    > Cc: linux-kernel@vger.kernel.org
    > Cc: linuxppc-dev@lists.ozlabs.org
    > Cc: sparclinux@vger.kernel.org
    > Link: http://lkml.kernel.org/r/20140606175316.GV13930@laptop.programming.kicks-ass.net
    > Signed-off-by: Ingo Molnar <mingo@kernel.org>

    Cc'ing stable: this issue was reported to begin after commit fb0527bd,
    so since v3.13.

    Thanks,
    Davidlohr



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