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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120523161932.GN14757@aftab.osrc.amd.com>
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/