x86/gnttab: fix asm() operand in gnttab_clear_flag()

The operand needs to use the 'w' modifier in case the compiler happens
to pick a register (which apparently it does for no-one but the
reporter of this problem).

Reported-by: Lin Ming <mlin@ss.pku.edu.cn>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
xen-unstable changeset:   25092:a66fb91cb8d3
xen-unstable date:        Fri Mar 23 08:39:39 2012 +0100

diff --git a/xen/include/asm-x86/grant_table.h b/xen/include/asm-x86/grant_table.h
index db8bfb46f23f90c37d6cea3383d7a189612cea10..3013869384171bf1a2c6afa55da56e5cd49b4cf8 100644 (file)
--- a/xen/include/asm-x86/grant_table.h
+++ b/xen/include/asm-x86/grant_table.h
@@ -54,7 +54,7 @@ static inline void gnttab_clear_flag(unsigned int nr, uint16_t *st)
      * Note that this cannot be clear_bit(), as the access must be
      * confined to the specified 2 bytes.
      */
-    asm volatile ("lock btrw %1,%0" : "=m" (*st) : "Ir" (nr), "m" (*st));
+    asm volatile ("lock btrw %w1,%0" : "=m" (*st) : "Ir" (nr), "m" (*st));
 }
 
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