Re: [tip:locking/urgent] locking/mutex: Disable optimistic spinning on some architectures

[Davidlohr Bueso]

On Thu, 2014-07-17 at 20:07 -0700, Davidlohr Bueso wrote:
> 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.

Bah, never mind, I missed it when scanning the Cc list. Sorry about the
noise.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/