linux-kernel - Re: Memory corruption due to word sharing

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Message-Id: <20120201.130905.1131458895704793597.davem@davemloft.net>
Date:	Wed, 01 Feb 2012 13:09:05 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	matz@...e.de
Cc:	jkosina@...e.cz, torvalds@...ux-foundation.org, walters@...bum.org,
	jack@...e.cz, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, dsterba@...e.cz, ptesarik@...e.cz,
	rguenther@...e.de, gcc@....gnu.org
Subject: Re: Memory corruption due to word sharing

From: Michael Matz <matz@...e.de>
Date: Wed, 1 Feb 2012 18:41:05 +0100 (CET)

> One problem is that it's not a new problem, GCC emitted similar code since 
> about forever, and still they turned up only now (well, probably because 
> ia64 is dead, but sparc64 should have similar problems). 

Indeed, on sparc64 it does do the silly 64-bit access too:

wrong:
        ldx     [%o0+8], %g2
        sethi   %hi(2147483648), %g1
        or      %g2, %g1, %g1
        jmp     %o7+8
         stx    %g1, [%o0+8]

Personally I've avoided C bitfields like the plague in any code I've
written.
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