linux-kernel - Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

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Date:	Sun, 12 Nov 2006 14:50:24 +0100
From:	Bernhard Rosenkraenzer <bero@...linux.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

On Sunday, 12. November 2006 14:43, Avi Kivity wrote:
> 'sel' is a variable, so gcc can't provide it as an immediate operand.
> Specifying it as "rm" instead of "g" would have been better, but can't
> have any real influence.

Specifying it as "rm" instead of "g" does fix it -- patch attached.

> Well, for the code you posted in in the gcc bug, it probaby generated
> something like
>
>     mov $0, %fs
>
> which is indeed invalid assembly.  But the kvm miscompile is something
> else (running out of registers or something like that).

What am I overlooking? The code is the exact same (except I replaced "u16" 
with "unsigned short" to avoid the #include), and produces the exact same 
error message, and the fix is the same ("g" -> "rm").

View attachment "kvm_main-compilefix.patch" of type "text/x-diff" (425 bytes)