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

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Message-ID: <4FBD0C47.70600@zytor.com>
Date:	Wed, 23 May 2012 09:11:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	frank.arnold@....com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	borislav.petkov@....com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mce] x86/bitops: Move BIT_64() for a wider use

On 05/23/2012 09:10 AM, Peter Zijlstra wrote:
> On Wed, 2012-05-23 at 09:07 -0700, tip-bot for Borislav Petkov wrote:
>> +#define BIT_64(n)                      (U64_C(1) << (n))
> 
> Because writing 1ULL << n is too much work? 
> 

Because writing 1ULL << n is broken in anything that needs to be used in
assembly, for example.

	-hpa


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