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: <4A0C2C5F.4030008@zytor.com>
Date:	Thu, 14 May 2009 07:36:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Sheng Yang <sheng@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to
 64 bits in X86_64

Andi Kleen wrote:
> 
> Well they have to fix a lot of more stuff then, when I did 
> all the inline assembler >2GB objects were a explicit non goal. 
> It also wouldn't surprise me if that wasn't true on other architectures too.

512 MB, fwiw...

> It would be better to just use open coded C for that case and avoid inline 
> assembler.

It's not like the extra REX prefix is going to matter significantly for
any application, and given how trivial it is it doesn't seem like a big
deal at all.

	-hpa

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

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