linux-kernel - Re: [PATCH] x86: add missed clobber for 32-bit memmove

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Message-ID: <48F8BEE1.1010000@zytor.com>
Date:	Fri, 17 Oct 2008 09:35:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jike Song <albcamus@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: add missed clobber for 32-bit memmove

Jike Song wrote:
> memmove() is implemented by inline assembly. It calls std at first
> and cld at last, but EFLAGS still should be clobbered.

gcc always treats EFLAGS as clobbered on x86.  The "cc" clobber is 
needed on some platforms, but is a noop on x86.

	-hpa
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