[Xen-changelog] [xen-unstable] x86: small adjustment to asm constraints for c/s 19400

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1238501650 -3600
# Node ID cc4a2290c22487477a4ff5fbda05b349efb89319
# Parent  28a4dacea7ab38e1ea2276275c22835b5209e126
x86: small adjustment to asm constraints for c/s 19400

Properly indicate the variable that the asm writes to, and allow
compiler more freedom in selecting a suitable input operand for the
ltr instruction.

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

diff -r 28a4dacea7ab -r cc4a2290c224 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Tue Mar 31 13:12:35 2009 +0100
+++ b/xen/arch/x86/traps.c      Tue Mar 31 13:14:10 2009 +0100
@@ -3048,8 +3048,8 @@ void load_TR(void)
 
     /* Switch to non-compat GDT (which has B bit clear) to execute LTR. */
     asm volatile (
-        "sgdt %1; lgdt %2; ltr %%ax; lgdt %1"
-        : : "a" (TSS_ENTRY << 3), "m" (old_gdt), "m" (tss_gdt) : "memory" );
+        "sgdt %0; lgdt %2; ltr %w1; lgdt %0"
+        : "=m" (old_gdt) : "rm" (TSS_ENTRY << 3), "m" (tss_gdt) : "memory" );
 }
 
 void __devinit percpu_traps_init(void)

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