From f252ffd50c97dae87b45f1dbad24f71358ccfbd6 Mon Sep 17 00:00:00 2001 From: David Daney Date: Fri, 8 Jan 2010 17:17:43 -0800 Subject: MIPS: New macro smp_mb__before_llsc. Replace some instances of smp_llsc_mb() with a new macro smp_mb__before_llsc(). It is used before ll/sc sequences that are documented as needing write barrier semantics. The default implementation of smp_mb__before_llsc() is just smp_llsc_mb(), so there are no changes in semantics. Also simplify definition of smp_mb(), smp_rmb(), and smp_wmb() to be just barrier() in the non-SMP case. Signed-off-by: David Daney To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/851/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/system.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/mips/include/asm/system.h') diff --git a/arch/mips/include/asm/system.h b/arch/mips/include/asm/system.h index 83b5509e09e..bb937ccfba1 100644 --- a/arch/mips/include/asm/system.h +++ b/arch/mips/include/asm/system.h @@ -95,6 +95,8 @@ static inline unsigned long __xchg_u32(volatile int * m, unsigned int val) { __u32 retval; + smp_mb__before_llsc(); + if (kernel_uses_llsc && R10000_LLSC_WAR) { unsigned long dummy; @@ -147,6 +149,8 @@ static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val) { __u64 retval; + smp_mb__before_llsc(); + if (kernel_uses_llsc && R10000_LLSC_WAR) { unsigned long dummy; -- cgit v1.2.3