[Xen-devel] [PATCH v2 11/32] mips: reuse asm-generic/barrier.h

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

On mips dma_rmb, dma_wmb, smp_store_mb, read_barrier_depends,
smp_read_barrier_depends, smp_store_release and smp_load_acquire  match
the asm-generic variants exactly. Drop the local definitions and pull in
asm-generic/barrier.h instead.

This is in preparation to refactoring this code area.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 arch/mips/include/asm/barrier.h | 25 ++-----------------------
 1 file changed, 2 insertions(+), 23 deletions(-)

diff --git a/arch/mips/include/asm/barrier.h b/arch/mips/include/asm/barrier.h
index 752e0b8..3eac4b9 100644
--- a/arch/mips/include/asm/barrier.h
+++ b/arch/mips/include/asm/barrier.h
@@ -10,9 +10,6 @@
 
 #include <asm/addrspace.h>
 
-#define read_barrier_depends()         do { } while(0)
-#define smp_read_barrier_depends()     do { } while(0)
-
 #ifdef CONFIG_CPU_HAS_SYNC
 #define __sync()                               \
        __asm__ __volatile__(                   \
@@ -87,8 +84,6 @@
 
 #define wmb()          fast_wmb()
 #define rmb()          fast_rmb()
-#define dma_wmb()      fast_wmb()
-#define dma_rmb()      fast_rmb()
 
 #if defined(CONFIG_WEAK_ORDERING) && defined(CONFIG_SMP)
 # ifdef CONFIG_CPU_CAVIUM_OCTEON
@@ -112,9 +107,6 @@
 #define __WEAK_LLSC_MB         "               \n"
 #endif
 
-#define smp_store_mb(var, value) \
-       do { WRITE_ONCE(var, value); smp_mb(); } while (0)
-
 #define smp_llsc_mb()  __asm__ __volatile__(__WEAK_LLSC_MB : : :"memory")
 
 #ifdef CONFIG_CPU_CAVIUM_OCTEON
@@ -129,22 +121,9 @@
 #define nudge_writes() mb()
 #endif
 
-#define smp_store_release(p, v)                                                
\
-do {                                                                   \
-       compiletime_assert_atomic_type(*p);                             \
-       smp_mb();                                                       \
-       WRITE_ONCE(*p, v);                                              \
-} while (0)
-
-#define smp_load_acquire(p)                                            \
-({                                                                     \
-       typeof(*p) ___p1 = READ_ONCE(*p);                               \
-       compiletime_assert_atomic_type(*p);                             \
-       smp_mb();                                                       \
-       ___p1;                                                          \
-})
-
 #define smp_mb__before_atomic()        smp_mb__before_llsc()
 #define smp_mb__after_atomic() smp_llsc_mb()
 
+#include <asm-generic/barrier.h>
+
 #endif /* __ASM_BARRIER_H */
-- 
MST


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