linux-kernel - Re: [PATCH 0 of 4] x86: some more patches

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Message-Id: <478E3411.76E4.0078.0@novell.com>
Date:	Wed, 16 Jan 2008 15:42:57 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <ak@...e.de>
Cc:	"Glauber de Oliveira Costa" <glommer@...il.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0 of 4] x86: some more patches

>Yes, but if you cast to long the result will be 32bit again. Or do you
>rely on it being always used in 64bit signed context with sign extension?
>While that might work it would seem rather fragile to me, just asking
>for similar future bugs.

Even if conversion is to 64-bit unsigned, the value (being signed) will be
sign-extended first (to preserve its value modulo 2**<target type width>).

Jan

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