linux-kernel - Re: [PATCH] x86: Use __builtin_memset and __builtin

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Message-ID: <4AC2288E.3060309@zytor.com>
Date:	Tue, 29 Sep 2009 08:32:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...x.de,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH] x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy

On 09/29/2009 05:44 AM, Arnd Bergmann wrote:
> 
> The patch looks good, but is there a reason to keep it architecture
> specific? I would guess that the same logic applies to all architectures
> with gcc-4.x and could be put into include/linux/compiler-gcc4.h.
> 

Each architecture has its own implementation, and in some cases gcc will
even generate code which is illegal in the kernel.  It really needs to
be enabled by each architecture.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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