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[Xen-devel] [PATCH] x86: minor adjustment to asm constraint in get_page(

from [Jan Beulich]

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Subject:	[Xen-devel] [PATCH] x86: minor adjustment to asm constraint in get_page()
From:	"Jan Beulich" <jbeulich@xxxxxxxxxx>
Date:	Thu, 12 Jun 2008 15:38:10 +0100
Delivery-date:	Thu, 12 Jun 2008 07:38:22 -0700
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While not wrong, avoiding the unnecessary output allows the compiler a
little more freedom.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2008-06-12/xen/arch/x86/mm.c
===================================================================
--- 2008-06-12.orig/xen/arch/x86/mm.c   2008-06-12 09:08:36.000000000 +0200
+++ 2008-06-12/xen/arch/x86/mm.c        2008-06-12 09:08:42.000000000 +0200
@@ -1706,8 +1706,8 @@ int get_page(struct page_info *page, str
             return 0;
         }
         asm volatile (
-            LOCK_PREFIX "cmpxchg8b %3"
-            : "=d" (nd), "=a" (y), "=c" (d),
+            LOCK_PREFIX "cmpxchg8b %2"
+            : "=d" (nd), "=a" (y),
             "=m" (*(volatile u64 *)(&page->count_info))
             : "0" (d), "1" (x), "c" (d), "b" (nx) );
     }




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