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

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Message-ID: <1367384672.11020.34.camel@edumazet-glaptop>
Date:	Tue, 30 Apr 2013 22:04:32 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alan Modra <amodra@...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 Wed, 2013-05-01 at 13:24 +0930, Alan Modra wrote:
> 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.

Ah thanks.

This seems a pretty serious issue, is it documented somewhere that
ppc64, sparc64 and others need such compiler version ?

These kind of errors are pretty hard to find, its a pity to spend time
on them.




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