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

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Date:	Thu, 17 Jul 2014 20:10:21 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	mingo@...nel.org
Cc:	torvalds@...ux-foundation.org, catalin.marinas@....com,
	peterz@...radead.org, cmetcalf@...era.com, jason.low2@...com,
	linux@....linux.org.uk, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, hpa@...or.com, dave.anglin@...l.net,
	James.Bottomley@...senpartnership.com, will.deacon@....com,
	waiman.long@...com, james.hogan@...tec.com, mpatocka@...hat.com,
	davem@...emloft.net, paulmck@...ux.vnet.ibm.com,
	vgupta@...opsys.com, benh@...nel.crashing.org,
	jejb@...isc-linux.org, linux-tip-commits@...r.kernel.org,
	stable@...nel.org
Subject: Re: [tip:locking/urgent] locking/mutex: Disable optimistic spinning
 on some architectures

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@...radead.org>
> > AuthorDate: Fri, 6 Jun 2014 19:53:16 +0200
> > Committer:  Ingo Molnar <mingo@...nel.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@...radead.org>
> > Reported-by: Mikulas Patocka <mpatocka@...hat.com>
> > Cc: David Miller <davem@...emloft.net>
> > Cc: Chris Metcalf <cmetcalf@...era.com>
> > Cc: James Bottomley <James.Bottomley@...senpartnership.com>
> > Cc: Vineet Gupta <vgupta@...opsys.com>
> > Cc: Jason Low <jason.low2@...com>
> > Cc: Waiman Long <waiman.long@...com>
> > Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
> > Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: John David Anglin <dave.anglin@...l.net>
> > Cc: James Hogan <james.hogan@...tec.com>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: Davidlohr Bueso <davidlohr@...com>
> > Cc: stable@...r.kernel.org
> > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Russell King <linux@....linux.org.uk>
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org
> > Cc: linuxppc-dev@...ts.ozlabs.org
> > Cc: sparclinux@...r.kernel.org
> > Link: http://lkml.kernel.org/r/20140606175316.GV13930@laptop.programming.kicks-ass.net
> > Signed-off-by: Ingo Molnar <mingo@...nel.org>
> 
> 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.

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