[PATCH 16/34] powerpc: define __smp_xxx

Michael S. Tsirkin
2015-12-30T19:35:57Z

This defines __smp_XXX barriers for powerpc
for use by virtualization.

smp_XXX barriers are removed as they are
defined correctly by asm-generic/barriers.h

This reduces the amount of arch-specific boiler-plate code.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
arch/powerpc/include/asm/barrier.h | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
index 980ad0c..c0deafc 100644
--- a/arch/powerpc/include/asm/barrier.h
+++ b/arch/powerpc/include/asm/barrier.h
@@ -44,19 +44,11 @@
#define dma_rmb() __lwsync()
#define dma_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")

-#ifdef CONFIG_SMP
-#define smp_lwsync() __lwsync()
+#define __smp_lwsync() __lwsync()

-#define smp_mb() mb()
-#define smp_rmb() __lwsync()
-#define smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")
-#else
-#define smp_lwsync() barrier()
-
-#define smp_mb() barrier()
-#define smp_rmb() barrier()
-#define smp_wmb() barrier()
-#endif /* CONFIG_SMP */
+#define __smp_mb() mb()
+#define __smp_rmb() __lwsync()
+#define __smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")

/*
* This is a barrier which prevents following instructions from being
@@ -67,18 +59,18 @@
#define data_barrier(x) \
asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");

-#define smp_store_release(p, v) \
+#define __smp_store_release(p, v) \
do { \
compiletime_assert_atomic_type(*p); \
- smp_lwsync(); \
+ __smp_lwsync(); \
WRITE_ONCE(*p, v); \
} while (0)

-#define smp_load_acquire(p) \
+#define __smp_load_acquire(p) \
({ \
typeof(*p) ___p1 = READ_ONCE(*p); \
compiletime_assert_atomic_type(*p); \
- smp_lwsync(); \
+ __smp_lwsync(); \
___p1; \
})

--
MST