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

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Message-ID: <CA+55aFyPk0pPtKiMD7fP85Ho7q_fNrkvvc7MNnSz0Kgub2AJ_A@mail.gmail.com>
Date:	Wed, 23 May 2012 10:37:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Borislav Petkov <borislav.petkov@....com>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, frank.arnold@....com,
	akpm@...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 10:11 AM, Borislav Petkov <bp@...en8.de> wrote:
>
> And, in addition, hpa's example won't work too:
>
>        u64 msr = ~BIT(1);

Yes, that's a good example of something that can be problematic, and
is fundamentally different on 32-bit and 64-bit.

So maybe BIT() unconditionally being long, and BIT_64() being u64
simply is the right model.

                    Linus
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