ARM: Fix wrong dmb

The __kuser_cmpxchg code uses an ARMv6 dmb instruction, rather than
one based upon the architecture being built for.  Switch to using
the macro provided for this purpose, which also eliminates the
need for an ifdef.

Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index d2903e3bc8611b1712fe8befea100f9880451edc..6c5cf369183b414dee5e8685be889cd646d77a7e 100644 (file)
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -957,9 +957,7 @@ kuser_cmpxchg_fixup:
 
 #else
 
-#ifdef CONFIG_SMP
-       mcr     p15, 0, r0, c7, c10, 5  @ dmb
-#endif
+       smp_dmb
 1:     ldrex   r3, [r2]
        subs    r3, r3, r0
        strexeq r3, r1, [r2]