Merge branch 'max-sect' into upstream

[powerpc.git] / include / asm-x86_64 / atomic.h

diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 4048508..cecbf7b 100644 (file)
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -405,8 +405,14 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
 ({                                                             \
        int c, old;                                             \
        c = atomic_read(v);                                     \
-       while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
+       for (;;) {                                              \
+               if (unlikely(c == (u)))                         \
+                       break;                                  \
+               old = atomic_cmpxchg((v), c, c + (a));          \
+               if (likely(old == c))                           \
+                       break;                                  \
                c = old;                                        \
+       }                                                       \
        c != (u);                                               \
 })
 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
@@ -426,17 +432,5 @@ __asm__ __volatile__(LOCK "orl %0,%1" \
 #define smp_mb__before_atomic_inc()    barrier()
 #define smp_mb__after_atomic_inc()     barrier()
 
-/* ECC atomic, DMA, SMP and interrupt safe scrub function */
-
-static __inline__ void atomic_scrub(u32 *virt_addr, u32 size)
-{
-       u32 i;
-       for (i = 0; i < size / 4; i++, virt_addr++)
-               /* Very carefully read and write to memory atomically
-                * so we are interrupt, DMA and SMP safe.
-                */
-               __asm__ __volatile__("lock; addl $0, %0"::"m"(*virt_addr));
-}
-
 #include <asm-generic/atomic.h>
 #endif