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Date: Wed, 23 May 2012 18:19:32 +0200 From: Borislav Petkov <borislav.petkov@....com> To: "H. Peter Anvin" <hpa@...or.com> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>, <mingo@...nel.org>, <linux-kernel@...r.kernel.org>, <frank.arnold@....com>, <akpm@...ux-foundation.org>, <torvalds@...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 Wed, May 23, 2012 at 09:11:51AM -0700, H. Peter Anvin wrote: > 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. Actually we need a BIT() macro that works both on 32- and 64-bit. But that won't be that easy: http://lkml.indiana.edu/hypermail/linux/kernel/1010.1/02335.html And it should return UL for shift values < 32 and ULL otherwise. -- Regards/Gruss, Boris. Advanced Micro Devices GmbH Einsteinring 24, 85609 Dornach GM: Alberto Bozzo Reg: Dornach, Landkreis Muenchen HRB Nr. 43632 WEEE Registernr: 129 19551 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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