[Xen-changelog] [xen stable-4.9] x86: fix asm() constraint for GS selector update

[patchbot@xxxxxxx]

commit f8732452d2d4d740455f237f3d9fd14ec923279f
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Nov 16 11:43:40 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 16 11:43:40 2017 +0100

    x86: fix asm() constraint for GS selector update
    
    Exception fixup code may alter the operand, which ought to be reflected
    in the constraint.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 65ab53de34851243fb7793ebf12fd92a65f84ddd
    master date: 2017-10-27 13:49:10 +0100
---
 xen/arch/x86/x86_64/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index aa1b94f..6b1d765 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -1075,7 +1075,7 @@ long do_set_segment_base(unsigned int which, unsigned 
long base)
             "     jmp  1b             \n"
             ".previous                \n"
             _ASM_EXTABLE(1b, 2b)
-            : : "r" (base&0xffff) );
+            : "+r" (base) );
         break;
 
     default:
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9

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