linux-kernel - Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86

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Message-ID: <20090514083250.GD19296@one.firstfloor.org>
Date:	Thu, 14 May 2009 10:32:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Sheng Yang <sheng@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86_64

> Well, I just think lots of "#ifdef/#else" is a little annoying here, then use 
> REX...

Better add a 'q' string concatination then. The problem with rex is that most 
people can't read it even if they know assembler --  they don't know
all the details of instruction encoding.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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