[Xen-devel] [PATCH 2/2] x86: fix asm() constraint for GS selector update

["Jan Beulich" <JBeulich@xxxxxxxx>]

Exception fixup code may alter the operand, which ought to be reflected
in the constraint.

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

--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -1062,7 +1062,7 @@ long do_set_segment_base(unsigned int wh
             "     jmp  1b             \n"
             ".previous                \n"
             _ASM_EXTABLE(1b, 2b)
-            : : "r" (base&0xffff) );
+            : "+r" (base) );
         break;
 
     default:




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