linux-kernel - Re: [2.6.30-rc8 KVM] gcc 3.3 dies at emulate_2op

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Message-ID: <4A2B8B22.3020602@redhat.com>
Date:	Sun, 07 Jun 2009 12:40:50 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
CC:	guillaume.thouvenin@....bull.net, linux-kernel@...r.kernel.org
Subject: Re: [2.6.30-rc8 KVM] gcc 3.3 dies at emulate_2op_cl().

Tetsuo Handa wrote:
> Avi Kivity wrote:
>   
>> What if you change "rm" in the patch to "m"?
>>     
> It still fails.
>
>         __asm__ __volatile__ (                      \
>             _PRE_EFLAGS("0", "5", "2")              \
>             _op _suffix " %4,%1 \n"                 \
>             _POST_EFLAGS("0", "5", "2")             \
>             : "=m" (_eflags), "+m" (_dstv), "=&r" (_tmp)        \
>             : "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK)       \
>             );
>   

I can eliminate _tmp by using lahf/sahf, but it's not going to be a 
trivial patch.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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