x86, hvm: gcc44 build fix.

Broken constrain in inline asm.  Bytewise access works with a, b, c, d
registers only, thus "r" is wrong, it must be "q".  gcc 4.4 tries to
use the si register, which doesn't work and thus fails the build.

From: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/arch/x86/hvm/vpic.c b/xen/arch/x86/hvm/vpic.c
index 30486ce93595543570aaf5ef8dd299270114da1c..cf43f1e5448f11c8b6281b7ef820d3762694c4e7 100644 (file)
--- a/xen/arch/x86/hvm/vpic.c
+++ b/xen/arch/x86/hvm/vpic.c
@@ -56,7 +56,7 @@ static int vpic_get_priority(struct hvm_hw_vpic *vpic, uint8_t mask)
 
     /* prio = ffs(mask ROR vpic->priority_add); */
     asm ( "ror %%cl,%b1 ; bsf %1,%0"
-          : "=r" (prio) : "r" ((uint32_t)mask), "c" (vpic->priority_add) );
+          : "=r" (prio) : "q" ((uint32_t)mask), "c" (vpic->priority_add) );
     return prio;
 }