linux-kernel - Re: [PATCH] bitops.h: Widen BIT macro to support 64-bit types

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Date:	Thu, 14 Oct 2010 05:12:13 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Borislav Petkov <bp@...64.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	akpm <akpm@...ux-foundation.org>, linux-arch@...r.kernel.org
Subject: Re: [PATCH] bitops.h: Widen BIT macro to support 64-bit types

On Thu, Oct 14, 2010 at 12:58:55PM +0200, Borislav Petkov wrote:
>  #ifdef	__KERNEL__
> -#define BIT(nr)			(1UL << (nr))
> +#define BIT(nr)			(U64_C(1) << (nr))

Why not just use 1ULL instead?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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