[Xen-changelog] [xen-unstable] x86: minor adjustment to asm constraint in get_page()

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1213283839 -3600
# Node ID 7cf53a91c3a3c6ab863461c2ff4a90656a155602
# Parent  882eb6186c2dbc7f73280f3aca3600faad44fbf0
x86: minor adjustment to asm constraint in get_page()

While not wrong, avoiding the unnecessary output allows the compiler a
little more freedom.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/arch/x86/mm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r 882eb6186c2d -r 7cf53a91c3a3 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Thu Jun 12 16:11:39 2008 +0100
+++ b/xen/arch/x86/mm.c Thu Jun 12 16:17:19 2008 +0100
@@ -1702,8 +1702,8 @@ 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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