[Xen-changelog] [xen master] x86: fix asm() constraint in clear_user()

[patchbot@xxxxxxx]

commit 157db407533fb55c0ce0c133991e3cb951b76484
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Dec 19 17:52:42 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Dec 19 17:52:42 2016 +0100

    x86: fix asm() constraint in clear_user()
    
    Commit 2fdf5b2554 ("x86: streamline copying to/from user memory")
    wrongly used "g" here, when it obviously needs to be a register.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/usercopy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/usercopy.c b/xen/arch/x86/usercopy.c
index d1303a9..1d1ef07 100644
--- a/xen/arch/x86/usercopy.c
+++ b/xen/arch/x86/usercopy.c
@@ -141,7 +141,7 @@ unsigned clear_user(void __user *to, unsigned n)
             _ASM_EXTABLE(0b,3b)
             _ASM_EXTABLE(1b,2b)
             : [cnt] "=&c" (n), [to] "+D" (to)
-            : [bytes] "g" (n & (BYTES_PER_LONG - 1)),
+            : [bytes] "r" (n & (BYTES_PER_LONG - 1)),
               [longs] "0" (n / BYTES_PER_LONG), "a" (0) );
         clac();
     }
--
generated by git-patchbot for /home/xen/git/xen.git#master

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