1 files changed, 348 insertions, 13 deletions

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 5b08a8540ecf..00a5763e850e 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -2,6 +2,329 @@
 #ifndef _LINUX_ATOMIC_H
 #define _LINUX_ATOMIC_H
 #include <asm/atomic.h>
+#include <asm/barrier.h>
+
+/*
+ * Relaxed variants of xchg, cmpxchg and some atomic operations.
+ *
+ * We support four variants:
+ *
+ * - Fully ordered: The default implementation, no suffix required.
+ * - Acquire: Provides ACQUIRE semantics, _acquire suffix.
+ * - Release: Provides RELEASE semantics, _release suffix.
+ * - Relaxed: No ordering guarantees, _relaxed suffix.
+ *
+ * For compound atomics performing both a load and a store, ACQUIRE
+ * semantics apply only to the load and RELEASE semantics only to the
+ * store portion of the operation. Note that a failed cmpxchg_acquire
+ * does -not- imply any memory ordering constraints.
+ *
+ * See Documentation/memory-barriers.txt for ACQUIRE/RELEASE definitions.
+ */
+
+#ifndef atomic_read_acquire
+#define  atomic_read_acquire(v)         smp_load_acquire(&(v)->counter)
+#endif
+
+#ifndef atomic_set_release
+#define  atomic_set_release(v, i)       smp_store_release(&(v)->counter, (i))
+#endif
+
+/*
+ * The idea here is to build acquire/release variants by adding explicit
+ * barriers on top of the relaxed variant. In the case where the relaxed
+ * variant is already fully ordered, no additional barriers are needed.
+ */
+#define __atomic_op_acquire(op, args...)                                \
+({                                                                      \
+        typeof(op##_relaxed(args)) __ret  = op##_relaxed(args);         \
+        smp_mb__after_atomic();                                         \
+        __ret;                                                          \
+})
+
+#define __atomic_op_release(op, args...)                                \
+({                                                                      \
+        smp_mb__before_atomic();                                        \
+        op##_relaxed(args);                                             \
+})
+
+#define __atomic_op_fence(op, args...)                                  \
+({                                                                      \
+        typeof(op##_relaxed(args)) __ret;                               \
+        smp_mb__before_atomic();                                        \
+        __ret = op##_relaxed(args);                                     \
+        smp_mb__after_atomic();                                         \
+        __ret;                                                          \
+})
+
+/* atomic_add_return_relaxed */
+#ifndef atomic_add_return_relaxed
+#define  atomic_add_return_relaxed      atomic_add_return
+#define  atomic_add_return_acquire      atomic_add_return
+#define  atomic_add_return_release      atomic_add_return
+
+#else /* atomic_add_return_relaxed */
+
+#ifndef atomic_add_return_acquire
+#define  atomic_add_return_acquire(...)                                 \
+        __atomic_op_acquire(atomic_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic_add_return_release
+#define  atomic_add_return_release(...)                                 \
+        __atomic_op_release(atomic_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic_add_return
+#define  atomic_add_return(...)                                         \
+        __atomic_op_fence(atomic_add_return, __VA_ARGS__)
+#endif
+#endif /* atomic_add_return_relaxed */
+
+/* atomic_sub_return_relaxed */
+#ifndef atomic_sub_return_relaxed
+#define  atomic_sub_return_relaxed      atomic_sub_return
+#define  atomic_sub_return_acquire      atomic_sub_return
+#define  atomic_sub_return_release      atomic_sub_return
+
+#else /* atomic_sub_return_relaxed */
+
+#ifndef atomic_sub_return_acquire
+#define  atomic_sub_return_acquire(...)                                 \
+        __atomic_op_acquire(atomic_sub_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic_sub_return_release
+#define  atomic_sub_return_release(...)                                 \
+        __atomic_op_release(atomic_sub_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic_sub_return
+#define  atomic_sub_return(...)                                         \
+        __atomic_op_fence(atomic_sub_return, __VA_ARGS__)
+#endif
+#endif /* atomic_sub_return_relaxed */
+
+/* atomic_xchg_relaxed */
+#ifndef atomic_xchg_relaxed
+#define  atomic_xchg_relaxed            atomic_xchg
+#define  atomic_xchg_acquire            atomic_xchg
+#define  atomic_xchg_release            atomic_xchg
+
+#else /* atomic_xchg_relaxed */
+
+#ifndef atomic_xchg_acquire
+#define  atomic_xchg_acquire(...)                                       \
+        __atomic_op_acquire(atomic_xchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic_xchg_release
+#define  atomic_xchg_release(...)                                       \
+        __atomic_op_release(atomic_xchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic_xchg
+#define  atomic_xchg(...)                                               \
+        __atomic_op_fence(atomic_xchg, __VA_ARGS__)
+#endif
+#endif /* atomic_xchg_relaxed */
+
+/* atomic_cmpxchg_relaxed */
+#ifndef atomic_cmpxchg_relaxed
+#define  atomic_cmpxchg_relaxed         atomic_cmpxchg
+#define  atomic_cmpxchg_acquire         atomic_cmpxchg
+#define  atomic_cmpxchg_release         atomic_cmpxchg
+
+#else /* atomic_cmpxchg_relaxed */
+
+#ifndef atomic_cmpxchg_acquire
+#define  atomic_cmpxchg_acquire(...)                                    \
+        __atomic_op_acquire(atomic_cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic_cmpxchg_release
+#define  atomic_cmpxchg_release(...)                                    \
+        __atomic_op_release(atomic_cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic_cmpxchg
+#define  atomic_cmpxchg(...)                                            \
+        __atomic_op_fence(atomic_cmpxchg, __VA_ARGS__)
+#endif
+#endif /* atomic_cmpxchg_relaxed */
+
+#ifndef atomic64_read_acquire
+#define  atomic64_read_acquire(v)       smp_load_acquire(&(v)->counter)
+#endif
+
+#ifndef atomic64_set_release
+#define  atomic64_set_release(v, i)     smp_store_release(&(v)->counter, (i))
+#endif
+
+/* atomic64_add_return_relaxed */
+#ifndef atomic64_add_return_relaxed
+#define  atomic64_add_return_relaxed    atomic64_add_return
+#define  atomic64_add_return_acquire    atomic64_add_return
+#define  atomic64_add_return_release    atomic64_add_return
+
+#else /* atomic64_add_return_relaxed */
+
+#ifndef atomic64_add_return_acquire
+#define  atomic64_add_return_acquire(...)                               \
+        __atomic_op_acquire(atomic64_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_add_return_release
+#define  atomic64_add_return_release(...)                               \
+        __atomic_op_release(atomic64_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_add_return
+#define  atomic64_add_return(...)                                       \
+        __atomic_op_fence(atomic64_add_return, __VA_ARGS__)
+#endif
+#endif /* atomic64_add_return_relaxed */
+
+/* atomic64_sub_return_relaxed */
+#ifndef atomic64_sub_return_relaxed
+#define  atomic64_sub_return_relaxed    atomic64_sub_return
+#define  atomic64_sub_return_acquire    atomic64_sub_return
+#define  atomic64_sub_return_release    atomic64_sub_return
+
+#else /* atomic64_sub_return_relaxed */
+
+#ifndef atomic64_sub_return_acquire
+#define  atomic64_sub_return_acquire(...)                               \
+        __atomic_op_acquire(atomic64_sub_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_sub_return_release
+#define  atomic64_sub_return_release(...)                               \
+        __atomic_op_release(atomic64_sub_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_sub_return
+#define  atomic64_sub_return(...)                                       \
+        __atomic_op_fence(atomic64_sub_return, __VA_ARGS__)
+#endif
+#endif /* atomic64_sub_return_relaxed */
+
+/* atomic64_xchg_relaxed */
+#ifndef atomic64_xchg_relaxed
+#define  atomic64_xchg_relaxed          atomic64_xchg
+#define  atomic64_xchg_acquire          atomic64_xchg
+#define  atomic64_xchg_release          atomic64_xchg
+
+#else /* atomic64_xchg_relaxed */
+
+#ifndef atomic64_xchg_acquire
+#define  atomic64_xchg_acquire(...)                                     \
+        __atomic_op_acquire(atomic64_xchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_xchg_release
+#define  atomic64_xchg_release(...)                                     \
+        __atomic_op_release(atomic64_xchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_xchg
+#define  atomic64_xchg(...)                                             \
+        __atomic_op_fence(atomic64_xchg, __VA_ARGS__)
+#endif
+#endif /* atomic64_xchg_relaxed */
+
+/* atomic64_cmpxchg_relaxed */
+#ifndef atomic64_cmpxchg_relaxed
+#define  atomic64_cmpxchg_relaxed       atomic64_cmpxchg
+#define  atomic64_cmpxchg_acquire       atomic64_cmpxchg
+#define  atomic64_cmpxchg_release       atomic64_cmpxchg
+
+#else /* atomic64_cmpxchg_relaxed */
+
+#ifndef atomic64_cmpxchg_acquire
+#define  atomic64_cmpxchg_acquire(...)                                  \
+        __atomic_op_acquire(atomic64_cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_cmpxchg_release
+#define  atomic64_cmpxchg_release(...)                                  \
+        __atomic_op_release(atomic64_cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_cmpxchg
+#define  atomic64_cmpxchg(...)                                          \
+        __atomic_op_fence(atomic64_cmpxchg, __VA_ARGS__)
+#endif
+#endif /* atomic64_cmpxchg_relaxed */
+
+/* cmpxchg_relaxed */
+#ifndef cmpxchg_relaxed
+#define  cmpxchg_relaxed                cmpxchg
+#define  cmpxchg_acquire                cmpxchg
+#define  cmpxchg_release                cmpxchg
+
+#else /* cmpxchg_relaxed */
+
+#ifndef cmpxchg_acquire
+#define  cmpxchg_acquire(...)                                           \
+        __atomic_op_acquire(cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef cmpxchg_release
+#define  cmpxchg_release(...)                                           \
+        __atomic_op_release(cmpxchg, __VA_ARGS__)
+#endif
+
+#ifndef cmpxchg
+#define  cmpxchg(...)                                                   \
+        __atomic_op_fence(cmpxchg, __VA_ARGS__)
+#endif
+#endif /* cmpxchg_relaxed */
+
+/* cmpxchg64_relaxed */
+#ifndef cmpxchg64_relaxed
+#define  cmpxchg64_relaxed              cmpxchg64
+#define  cmpxchg64_acquire              cmpxchg64
+#define  cmpxchg64_release              cmpxchg64
+
+#else /* cmpxchg64_relaxed */
+
+#ifndef cmpxchg64_acquire
+#define  cmpxchg64_acquire(...)                                         \
+        __atomic_op_acquire(cmpxchg64, __VA_ARGS__)
+#endif
+
+#ifndef cmpxchg64_release
+#define  cmpxchg64_release(...)                                         \
+        __atomic_op_release(cmpxchg64, __VA_ARGS__)
+#endif
+
+#ifndef cmpxchg64
+#define  cmpxchg64(...)                                                 \
+        __atomic_op_fence(cmpxchg64, __VA_ARGS__)
+#endif
+#endif /* cmpxchg64_relaxed */
+
+/* xchg_relaxed */
+#ifndef xchg_relaxed
+#define  xchg_relaxed                   xchg
+#define  xchg_acquire                   xchg
+#define  xchg_release                   xchg
+
+#else /* xchg_relaxed */
+
+#ifndef xchg_acquire
+#define  xchg_acquire(...)              __atomic_op_acquire(xchg, __VA_ARGS__)
+#endif
+
+#ifndef xchg_release
+#define  xchg_release(...)              __atomic_op_release(xchg, __VA_ARGS__)
+#endif
+
+#ifndef xchg
+#define  xchg(...)                      __atomic_op_fence(xchg, __VA_ARGS__)
+#endif
+#endif /* xchg_relaxed */
 
 /**
  * atomic_add_unless - add unless the number is already a given value
@@ -28,6 +351,23 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
 #define atomic_inc_not_zero(v)          atomic_add_unless((v), 1, 0)
 #endif
 
+#ifndef atomic_andnot
+static inline void atomic_andnot(int i, atomic_t *v)
+{
+        atomic_and(~i, v);
+}
+#endif
+
+static inline __deprecated void atomic_clear_mask(unsigned int mask, atomic_t *v)
+{
+        atomic_andnot(mask, v);
+}
+
+static inline __deprecated void atomic_set_mask(unsigned int mask, atomic_t *v)
+{
+        atomic_or(mask, v);
+}
+
 /**
  * atomic_inc_not_zero_hint - increment if not null
  * @v: pointer of type atomic_t
@@ -111,21 +451,16 @@ static inline int atomic_dec_if_positive(atomic_t *v)
 }
 #endif
 
-#ifndef CONFIG_ARCH_HAS_ATOMIC_OR
-static inline void atomic_or(int i, atomic_t *v)
-{
-        int old;
-        int new;
-
-        do {
-                old = atomic_read(v);
-                new = old | i;
-        } while (atomic_cmpxchg(v, old, new) != old);
-}
-#endif /* #ifndef CONFIG_ARCH_HAS_ATOMIC_OR */
-
 #include <asm-generic/atomic-long.h>
 #ifdef CONFIG_GENERIC_ATOMIC64
 #include <asm-generic/atomic64.h>
 #endif
+
+#ifndef atomic64_andnot
+static inline void atomic64_andnot(long long i, atomic64_t *v)
+{
+        atomic64_and(~i, v);
+}
+#endif
+
 #endif /* _LINUX_ATOMIC_H */