linux-kernel - Re: x86: A fast way to check capabilities of the current cpu

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Message-ID: <buolj3pja86.fsf@dhlpc061.dev.necel.com>
Date:	Fri, 17 Dec 2010 13:26:33 +0900
From:	Miles Bader <miles@....org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>,
	Pekka Enbeerg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: x86: A fast way to check capabilities of the current cpu

"H. Peter Anvin" <hpa@...or.com> writes:
> The alternatives are equivalent when used in the common context.  Your
> examples are bogus, because they don't account for the
> __builtin_constant_p().

Ah, true ... :}

-miles

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