netdev - Re: [PATCH net-next] af_unix: fix a fatal race with bit fields

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Message-ID: <20130501035425.GD5221@bubble.grove.modra.org>
Date:	Wed, 1 May 2013 13:24:25 +0930
From:	Alan Modra <amodra@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Anton Blanchard <anton@...ba.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	Ambrose Feinstein <ambrose@...gle.com>
Subject: Re: [PATCH net-next] af_unix: fix a fatal race with bit fields

On Tue, Apr 30, 2013 at 07:24:20PM -0700, Eric Dumazet wrote:
> 	li 11,1
> 	ld 0,0(9)
> 	rldimi 0,11,31,32
> 	std 0,0(9)
> 	blr
> 	.ident	"GCC: (GNU) 4.6.3"
> 
> You can see "ld 0,0(9)" is used : its a 64 bit load.

Yup.  This is not a powerpc64 specific problem.  See
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52080
Fixed in 4.8.0 and 4.7.3.

-- 
Alan Modra
Australia Development Lab, IBM
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