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

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Date:	Thu, 14 Oct 2010 14:12:30 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Matthew Wilcox <matthew@....cx>
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" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] bitops.h: Widen BIT macro to support 64-bit types

From: Matthew Wilcox <matthew@....cx>
Date: Thu, Oct 14, 2010 at 07:12:13AM -0400

> 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?

Wanted to be __ASSEMBLY__ safe.

-- 
Regards/Gruss,
Boris.

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