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ARM: Fix wrong dmb

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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>
This commit is contained in:
Russell King 2010-01-12 18:59:16 +00:00
parent cc20b900be
commit 7511bce406
1 changed files with 1 additions and 3 deletions
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4
arch/arm/kernel/entry-armv.S
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@ -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]