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[Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register
From: Zachary Amsden <zach@xxxxxxxxxx>
Date: Thu, 01 Mar 2007 16:45:01 -0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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Jeremy Fitzhardinge wrote:
Fix a few clobbers to include the return register.  The clobbers set
is the set of all registers modified (or may be modified) by the code
snippet, regardless of whether it was deliberate or accidental.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Zachary Amsden <zach@xxxxxxxxxx>

---
 include/asm-i386/paravirt.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

===================================================================
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -556,7 +556,7 @@ static inline unsigned long __raw_local_
                                           "popl %%edx; popl %%ecx")
                             : "=a"(f): "m"(paravirt_ops.save_fl),
                               paravirt_type(PARAVIRT_PATCH(save_fl)),
-                              paravirt_clobber(CLBR_NONE)
+                              paravirt_clobber(CLBR_EAX)
                             : "memory", "cc");
        return f;

Has this been tested on older gcc's? I seem to recall them barfing over things like this.

Zach

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