[Xen-changelog] [xen-4.1-testing] x86/gnttab: fix asm() operand in gnttab_clear_flag()

[Xen patchbot-4.1-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1332511102 0
# Node ID 35e2f18e04b6fc3e6a55e1ad4ba9080044083f6a
# Parent  14416d8215d455302d637ed801b0de0ec72645f5
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@xxxxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   25092:a66fb91cb8d3
xen-unstable date:        Fri Mar 23 08:39:39 2012 +0100
---


diff -r 14416d8215d4 -r 35e2f18e04b6 xen/include/asm-x86/grant_table.h
--- a/xen/include/asm-x86/grant_table.h Wed Mar 14 12:02:02 2012 +0000
+++ b/xen/include/asm-x86/grant_table.h Fri Mar 23 13:58:22 2012 +0000
@@ -54,7 +54,7 @@
      * 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));
 }
 
 /* Foreign mappings of HHVM-guest pages do not modify the type count. */

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog