linux-kernel - Re: [tip:x86/mce] x86/bitops: Move BIT

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Message-ID: <4FBD1365.4090800@zytor.com>
Date:	Wed, 23 May 2012 09:42:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Borislav Petkov <borislav.petkov@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, frank.arnold@....com,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mce] x86/bitops: Move BIT_64() for a wider use

On 05/23/2012 09:40 AM, Linus Torvalds wrote:
> On Wed, May 23, 2012 at 9:19 AM, Borislav Petkov
> <borislav.petkov@....com> wrote:
>>
>> Actually we need a BIT() macro that works both
>> on 32- and 64-bit. But that won't be that easy:
> 
> We could use __builtin_choose_expr(), but that *only* works with constants.
> 

And it doesn't work in assembly.  However, I really question the assumption.

	-hpa


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

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