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Date: Sat, 21 Jul 2001 16:45:44 -0700
From: Richard Henderson <rth@twiddle.net>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: ja@himel.com, linux-kernel@vger.kernel.org
Subject: Re: cpuid_eax damages registers (2.4.7pre7)
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In-Reply-To: <200107181510.f6IFAMW03662@penguin.transmeta.com>; from torvalds@transmeta.com on Wed, Jul 18, 2001 at 08:10:22AM -0700
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On Wed, Jul 18, 2001 at 08:10:22AM -0700, Linus Torvalds wrote:
>  - fix _all_ the "cpuid*()" functions to have
> 
> 	:"0" (op)
> 
>    instead of their current incorrect
> 
> 	:"a" (op)
> 
>    (we're supposed to explicitly tell the compiler that the first input
>    is the same as the first output)

FWIW, using "a" as the input constraint isn't incorrect.
The two are equivalent given a singleton register class.


r~
-
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