linux-kernel - Re: [ 20/82] ARM: 7467/1: mutex: use generic xchg-based implementation for ARMv6+

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Message-ID: <20120815145552.GI29448@mudshark.cambridge.arm.com>
Date:	Wed, 15 Aug 2012 15:55:53 +0100
From:	Will Deacon <will.deacon@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Nicolas Pitre <nico@...aro.org>,
	Shan Kang <kangshan0910@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [ 20/82] ARM: 7467/1: mutex: use generic xchg-based
 implementation for ARMv6+

On Wed, Aug 15, 2012 at 03:49:56PM +0100, Greg Kroah-Hartman wrote:
> > Will Deacon wrote:
> > > The additional patch should also be CC'd to stable and is sitting in -tip
> > > somewhere I believe, so it shouldn't be long before it does hit mainline.
> > > 
> > > Without this patch there's a memory-ordering bug (which we seem to have hit
> > > once in > 5 years). With the patch there's a mutex lockup issue on SMP systems
> > > that I can provoke with enough hackbenching, so you may want to hold off for
> > > now.
> 
> Ah, ok, missed that.
> 
> How about I just drop this for now, and when someone (Will?) feels it is
> "good enough time to wait", they will resend it to
> stable@...r.kernel.org so that we can add it then?  Otherwise I'll just
> loose it somewhere.

Fine by me. It doesn't conflict with the other patch either, so it won't be
a problem if you get that one first.

Will
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