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

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Date:	Sun, 7 Jun 2009 19:00:28 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	avi@...hat.com
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().

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

I don't know what's happening here.

If I comment out (_dst).bytes == 2 , it compiles.
The problem happens only "w" + "unsigned short" case.

# diff -urp arch/x86/kvm/x86_emulate.c~ arch/x86/kvm/x86_emulate.c
--- arch/x86/kvm/x86_emulate.c~ 2009-06-03 12:07:25.000000000 +0900
+++ arch/x86/kvm/x86_emulate.c  2009-06-07 17:52:05.591542272 +0900
@@ -461,8 +461,8 @@ static u32 group2_table[] = {
        do {                                                                    \
                switch ((_dst).bytes) {                                         \
                case 2:                                                         \
-                       __emulate_2op_cl(_op, _cl, _src, _dst, _eflags,         \
-                                               "w", unsigned short);           \
+                       /* __emulate_2op_cl(_op, _cl, _src, _dst, _eflags,      \
+                          "w", unsigned short); */             \
                        break;                                                  \
                case 4:                                                         \
                        __emulate_2op_cl(_op, _cl, _src, _dst, _eflags,         \
--
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