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

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Message-Id: <2688EFDC-868B-4BC6-AC02-79BE61419CB3@kernel.crashing.org>
Date:	Sun, 12 Nov 2006 15:10:55 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Bernhard Rosenkraenzer <bero@...linux.org>
Cc:	Avi Kivity <avi@...ranet.com>, linux-kernel@...r.kernel.org,
	akpm@...l.org
Subject: Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

>>> It does look like a gcc bug -- -O0 makes it go away.
>>> Details at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29808
>>
>> That's a different bug, gcc generates code that the assembler can't
>> handle.  Might be an assembler bug.
>
> It's the same thing, the code is taken from kvm_main.c:
>
> static void load_fs(u16 sel)
> {
>         asm ("mov %0, %%fs" : : "g"(sel));	<--- line 153
> }

Like I said in GCC PR29808, it's invalid -- use "r" instead.


Segher

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