locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relax...

Now that all the architectures have implemented support for these new
atomic primitives add on the generic infrastructure to expose and use
it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h
index 5e1f345b58ddf3529b074bab33d62bdefcdae5da..2d0d3cf791ab242db0c9dad7c89d2d3740842b8d 100644 (file)
--- a/include/asm-generic/atomic-long.h
+++ b/include/asm-generic/atomic-long.h
@@ -112,6 +112,40 @@ static __always_inline void atomic_long_dec(atomic_long_t *l)
        ATOMIC_LONG_PFX(_dec)(v);
 }
 
+#define ATOMIC_LONG_FETCH_OP(op, mo)                                   \
+static inline long                                                     \
+atomic_long_fetch_##op##mo(long i, atomic_long_t *l)                   \
+{                                                                      \
+       ATOMIC_LONG_PFX(_t) *v = (ATOMIC_LONG_PFX(_t) *)l;              \
+                                                                       \
+       return (long)ATOMIC_LONG_PFX(_fetch_##op##mo)(i, v);            \
+}
+
+ATOMIC_LONG_FETCH_OP(add, )
+ATOMIC_LONG_FETCH_OP(add, _relaxed)
+ATOMIC_LONG_FETCH_OP(add, _acquire)
+ATOMIC_LONG_FETCH_OP(add, _release)
+ATOMIC_LONG_FETCH_OP(sub, )
+ATOMIC_LONG_FETCH_OP(sub, _relaxed)
+ATOMIC_LONG_FETCH_OP(sub, _acquire)
+ATOMIC_LONG_FETCH_OP(sub, _release)
+ATOMIC_LONG_FETCH_OP(and, )
+ATOMIC_LONG_FETCH_OP(and, _relaxed)
+ATOMIC_LONG_FETCH_OP(and, _acquire)
+ATOMIC_LONG_FETCH_OP(and, _release)
+ATOMIC_LONG_FETCH_OP(andnot, )
+ATOMIC_LONG_FETCH_OP(andnot, _relaxed)
+ATOMIC_LONG_FETCH_OP(andnot, _acquire)
+ATOMIC_LONG_FETCH_OP(andnot, _release)
+ATOMIC_LONG_FETCH_OP(or, )
+ATOMIC_LONG_FETCH_OP(or, _relaxed)
+ATOMIC_LONG_FETCH_OP(or, _acquire)
+ATOMIC_LONG_FETCH_OP(or, _release)
+ATOMIC_LONG_FETCH_OP(xor, )
+ATOMIC_LONG_FETCH_OP(xor, _relaxed)
+ATOMIC_LONG_FETCH_OP(xor, _acquire)
+ATOMIC_LONG_FETCH_OP(xor, _release)
+
 #define ATOMIC_LONG_OP(op)                                             \
 static __always_inline void                                            \
 atomic_long_##op(long i, atomic_long_t *l)                             \
@@ -124,9 +158,9 @@ atomic_long_##op(long i, atomic_long_t *l)                          \
 ATOMIC_LONG_OP(add)
 ATOMIC_LONG_OP(sub)
 ATOMIC_LONG_OP(and)
+ATOMIC_LONG_OP(andnot)
 ATOMIC_LONG_OP(or)
 ATOMIC_LONG_OP(xor)
-ATOMIC_LONG_OP(andnot)
 
 #undef ATOMIC_LONG_OP
 

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 74f1a3704d7a1ddf61707b6da03fc2348521e4a1..a2304ccf4ed0f5a70a5b797755aa0c446fbdab2d 100644 (file)
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -61,6 +61,18 @@ static inline int atomic_##op##_return(int i, atomic_t *v)           \
        return c c_op i;                                                \
 }
 
+#define ATOMIC_FETCH_OP(op, c_op)                                      \
+static inline int atomic_fetch_##op(int i, atomic_t *v)                        \
+{                                                                      \
+       int c, old;                                                     \
+                                                                       \
+       c = v->counter;                                                 \
+       while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)          \
+               c = old;                                                \
+                                                                       \
+       return c;                                                       \
+}
+
 #else
 
 #include <linux/irqflags.h>
@@ -88,6 +100,20 @@ static inline int atomic_##op##_return(int i, atomic_t *v)          \
        return ret;                                                     \
 }
 
+#define ATOMIC_FETCH_OP(op, c_op)                                      \
+static inline int atomic_fetch_##op(int i, atomic_t *v)                        \
+{                                                                      \
+       unsigned long flags;                                            \
+       int ret;                                                        \
+                                                                       \
+       raw_local_irq_save(flags);                                      \
+       ret = v->counter;                                               \
+       v->counter = v->counter c_op i;                                 \
+       raw_local_irq_restore(flags);                                   \
+                                                                       \
+       return ret;                                                     \
+}
+
 #endif /* CONFIG_SMP */
 
 #ifndef atomic_add_return
@@ -98,6 +124,28 @@ ATOMIC_OP_RETURN(add, +)
 ATOMIC_OP_RETURN(sub, -)
 #endif
 
+#ifndef atomic_fetch_add
+ATOMIC_FETCH_OP(add, +)
+#endif
+
+#ifndef atomic_fetch_sub
+ATOMIC_FETCH_OP(sub, -)
+#endif
+
+#ifndef atomic_fetch_and
+ATOMIC_FETCH_OP(and, &)
+#endif
+
+#ifndef atomic_fetch_or
+#define atomic_fetch_or atomic_fetch_or
+
+ATOMIC_FETCH_OP(or, |)
+#endif
+
+#ifndef atomic_fetch_xor
+ATOMIC_FETCH_OP(xor, ^)
+#endif
+
 #ifndef atomic_and
 ATOMIC_OP(and, &)
 #endif
@@ -110,6 +158,7 @@ ATOMIC_OP(or, |)
 ATOMIC_OP(xor, ^)
 #endif
 
+#undef ATOMIC_FETCH_OP
 #undef ATOMIC_OP_RETURN
 #undef ATOMIC_OP
 

diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h
index d48e78ccad3dd8aedb3b020d46bdb00312c86772..dad68bf46c77012e144857898093b99dabea1cd7 100644 (file)
--- a/include/asm-generic/atomic64.h
+++ b/include/asm-generic/atomic64.h
@@ -27,16 +27,23 @@ extern void  atomic64_##op(long long a, atomic64_t *v);
 #define ATOMIC64_OP_RETURN(op)                                         \
 extern long long atomic64_##op##_return(long long a, atomic64_t *v);
 
-#define ATOMIC64_OPS(op)       ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op)
+#define ATOMIC64_FETCH_OP(op)                                          \
+extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
+
+#define ATOMIC64_OPS(op)       ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
 
 ATOMIC64_OPS(add)
 ATOMIC64_OPS(sub)
 
-ATOMIC64_OP(and)
-ATOMIC64_OP(or)
-ATOMIC64_OP(xor)
+#undef ATOMIC64_OPS
+#define ATOMIC64_OPS(op)       ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
+
+ATOMIC64_OPS(and)
+ATOMIC64_OPS(or)
+ATOMIC64_OPS(xor)
 
 #undef ATOMIC64_OPS
+#undef ATOMIC64_FETCH_OP
 #undef ATOMIC64_OP_RETURN
 #undef ATOMIC64_OP
 

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 351f89e1d15c5e63b16fb66fa625e212c1fb965a..2e6c013ac5a4542e1b0b0969b6a217f6852cb22a 100644 (file)
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -163,6 +163,154 @@
 #endif
 #endif /* atomic_dec_return_relaxed */
 
+
+/* atomic_fetch_add_relaxed */
+#ifndef atomic_fetch_add_relaxed
+#define atomic_fetch_add_relaxed       atomic_fetch_add
+#define atomic_fetch_add_acquire       atomic_fetch_add
+#define atomic_fetch_add_release       atomic_fetch_add
+
+#else /* atomic_fetch_add_relaxed */
+
+#ifndef atomic_fetch_add_acquire
+#define atomic_fetch_add_acquire(...)                                  \
+       __atomic_op_acquire(atomic_fetch_add, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_add_release
+#define atomic_fetch_add_release(...)                                  \
+       __atomic_op_release(atomic_fetch_add, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_add
+#define atomic_fetch_add(...)                                          \
+       __atomic_op_fence(atomic_fetch_add, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_add_relaxed */
+
+/* atomic_fetch_sub_relaxed */
+#ifndef atomic_fetch_sub_relaxed
+#define atomic_fetch_sub_relaxed       atomic_fetch_sub
+#define atomic_fetch_sub_acquire       atomic_fetch_sub
+#define atomic_fetch_sub_release       atomic_fetch_sub
+
+#else /* atomic_fetch_sub_relaxed */
+
+#ifndef atomic_fetch_sub_acquire
+#define atomic_fetch_sub_acquire(...)                                  \
+       __atomic_op_acquire(atomic_fetch_sub, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_sub_release
+#define atomic_fetch_sub_release(...)                                  \
+       __atomic_op_release(atomic_fetch_sub, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_sub
+#define atomic_fetch_sub(...)                                          \
+       __atomic_op_fence(atomic_fetch_sub, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_sub_relaxed */
+
+/* atomic_fetch_or_relaxed */
+#ifndef atomic_fetch_or_relaxed
+#define atomic_fetch_or_relaxed        atomic_fetch_or
+#define atomic_fetch_or_acquire        atomic_fetch_or
+#define atomic_fetch_or_release        atomic_fetch_or
+
+#else /* atomic_fetch_or_relaxed */
+
+#ifndef atomic_fetch_or_acquire
+#define atomic_fetch_or_acquire(...)                                   \
+       __atomic_op_acquire(atomic_fetch_or, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_or_release
+#define atomic_fetch_or_release(...)                                   \
+       __atomic_op_release(atomic_fetch_or, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_or
+#define atomic_fetch_or(...)                                           \
+       __atomic_op_fence(atomic_fetch_or, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_or_relaxed */
+
+/* atomic_fetch_and_relaxed */
+#ifndef atomic_fetch_and_relaxed
+#define atomic_fetch_and_relaxed       atomic_fetch_and
+#define atomic_fetch_and_acquire       atomic_fetch_and
+#define atomic_fetch_and_release       atomic_fetch_and
+
+#else /* atomic_fetch_and_relaxed */
+
+#ifndef atomic_fetch_and_acquire
+#define atomic_fetch_and_acquire(...)                                  \
+       __atomic_op_acquire(atomic_fetch_and, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_and_release
+#define atomic_fetch_and_release(...)                                  \
+       __atomic_op_release(atomic_fetch_and, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_and
+#define atomic_fetch_and(...)                                          \
+       __atomic_op_fence(atomic_fetch_and, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_and_relaxed */
+
+#ifdef atomic_andnot
+/* atomic_fetch_andnot_relaxed */
+#ifndef atomic_fetch_andnot_relaxed
+#define atomic_fetch_andnot_relaxed    atomic_fetch_andnot
+#define atomic_fetch_andnot_acquire    atomic_fetch_andnot
+#define atomic_fetch_andnot_release    atomic_fetch_andnot
+
+#else /* atomic_fetch_andnot_relaxed */
+
+#ifndef atomic_fetch_andnot_acquire
+#define atomic_fetch_andnot_acquire(...)                                       \
+       __atomic_op_acquire(atomic_fetch_andnot, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_andnot_release
+#define atomic_fetch_andnot_release(...)                                       \
+       __atomic_op_release(atomic_fetch_andnot, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_andnot
+#define atomic_fetch_andnot(...)                                               \
+       __atomic_op_fence(atomic_fetch_andnot, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_andnot_relaxed */
+#endif /* atomic_andnot */
+
+/* atomic_fetch_xor_relaxed */
+#ifndef atomic_fetch_xor_relaxed
+#define atomic_fetch_xor_relaxed       atomic_fetch_xor
+#define atomic_fetch_xor_acquire       atomic_fetch_xor
+#define atomic_fetch_xor_release       atomic_fetch_xor
+
+#else /* atomic_fetch_xor_relaxed */
+
+#ifndef atomic_fetch_xor_acquire
+#define atomic_fetch_xor_acquire(...)                                  \
+       __atomic_op_acquire(atomic_fetch_xor, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_xor_release
+#define atomic_fetch_xor_release(...)                                  \
+       __atomic_op_release(atomic_fetch_xor, __VA_ARGS__)
+#endif
+
+#ifndef atomic_fetch_xor
+#define atomic_fetch_xor(...)                                          \
+       __atomic_op_fence(atomic_fetch_xor, __VA_ARGS__)
+#endif
+#endif /* atomic_fetch_xor_relaxed */
+
+
 /* atomic_xchg_relaxed */
 #ifndef atomic_xchg_relaxed
 #define  atomic_xchg_relaxed           atomic_xchg
@@ -310,6 +458,26 @@ static inline void atomic_andnot(int i, atomic_t *v)
 {
        atomic_and(~i, v);
 }
+
+static inline int atomic_fetch_andnot(int i, atomic_t *v)
+{
+       return atomic_fetch_and(~i, v);
+}
+
+static inline int atomic_fetch_andnot_relaxed(int i, atomic_t *v)
+{
+       return atomic_fetch_and_relaxed(~i, v);
+}
+
+static inline int atomic_fetch_andnot_acquire(int i, atomic_t *v)
+{
+       return atomic_fetch_and_acquire(~i, v);
+}
+
+static inline int atomic_fetch_andnot_release(int i, atomic_t *v)
+{
+       return atomic_fetch_and_release(~i, v);
+}
 #endif
 
 static inline __deprecated void atomic_clear_mask(unsigned int mask, atomic_t *v)
@@ -535,6 +703,154 @@ static inline int atomic_fetch_or(int mask, atomic_t *p)
 #endif
 #endif /* atomic64_dec_return_relaxed */
 
+
+/* atomic64_fetch_add_relaxed */
+#ifndef atomic64_fetch_add_relaxed
+#define atomic64_fetch_add_relaxed     atomic64_fetch_add
+#define atomic64_fetch_add_acquire     atomic64_fetch_add
+#define atomic64_fetch_add_release     atomic64_fetch_add
+
+#else /* atomic64_fetch_add_relaxed */
+
+#ifndef atomic64_fetch_add_acquire
+#define atomic64_fetch_add_acquire(...)                                        \
+       __atomic_op_acquire(atomic64_fetch_add, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_add_release
+#define atomic64_fetch_add_release(...)                                        \
+       __atomic_op_release(atomic64_fetch_add, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_add
+#define atomic64_fetch_add(...)                                                \
+       __atomic_op_fence(atomic64_fetch_add, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_add_relaxed */
+
+/* atomic64_fetch_sub_relaxed */
+#ifndef atomic64_fetch_sub_relaxed
+#define atomic64_fetch_sub_relaxed     atomic64_fetch_sub
+#define atomic64_fetch_sub_acquire     atomic64_fetch_sub
+#define atomic64_fetch_sub_release     atomic64_fetch_sub
+
+#else /* atomic64_fetch_sub_relaxed */
+
+#ifndef atomic64_fetch_sub_acquire
+#define atomic64_fetch_sub_acquire(...)                                        \
+       __atomic_op_acquire(atomic64_fetch_sub, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_sub_release
+#define atomic64_fetch_sub_release(...)                                        \
+       __atomic_op_release(atomic64_fetch_sub, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_sub
+#define atomic64_fetch_sub(...)                                                \
+       __atomic_op_fence(atomic64_fetch_sub, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_sub_relaxed */
+
+/* atomic64_fetch_or_relaxed */
+#ifndef atomic64_fetch_or_relaxed
+#define atomic64_fetch_or_relaxed      atomic64_fetch_or
+#define atomic64_fetch_or_acquire      atomic64_fetch_or
+#define atomic64_fetch_or_release      atomic64_fetch_or
+
+#else /* atomic64_fetch_or_relaxed */
+
+#ifndef atomic64_fetch_or_acquire
+#define atomic64_fetch_or_acquire(...)                                 \
+       __atomic_op_acquire(atomic64_fetch_or, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_or_release
+#define atomic64_fetch_or_release(...)                                 \
+       __atomic_op_release(atomic64_fetch_or, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_or
+#define atomic64_fetch_or(...)                                         \
+       __atomic_op_fence(atomic64_fetch_or, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_or_relaxed */
+
+/* atomic64_fetch_and_relaxed */
+#ifndef atomic64_fetch_and_relaxed
+#define atomic64_fetch_and_relaxed     atomic64_fetch_and
+#define atomic64_fetch_and_acquire     atomic64_fetch_and
+#define atomic64_fetch_and_release     atomic64_fetch_and
+
+#else /* atomic64_fetch_and_relaxed */
+
+#ifndef atomic64_fetch_and_acquire
+#define atomic64_fetch_and_acquire(...)                                        \
+       __atomic_op_acquire(atomic64_fetch_and, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_and_release
+#define atomic64_fetch_and_release(...)                                        \
+       __atomic_op_release(atomic64_fetch_and, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_and
+#define atomic64_fetch_and(...)                                                \
+       __atomic_op_fence(atomic64_fetch_and, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_and_relaxed */
+
+#ifdef atomic64_andnot
+/* atomic64_fetch_andnot_relaxed */
+#ifndef atomic64_fetch_andnot_relaxed
+#define atomic64_fetch_andnot_relaxed  atomic64_fetch_andnot
+#define atomic64_fetch_andnot_acquire  atomic64_fetch_andnot
+#define atomic64_fetch_andnot_release  atomic64_fetch_andnot
+
+#else /* atomic64_fetch_andnot_relaxed */
+
+#ifndef atomic64_fetch_andnot_acquire
+#define atomic64_fetch_andnot_acquire(...)                                     \
+       __atomic_op_acquire(atomic64_fetch_andnot, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_andnot_release
+#define atomic64_fetch_andnot_release(...)                                     \
+       __atomic_op_release(atomic64_fetch_andnot, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_andnot
+#define atomic64_fetch_andnot(...)                                             \
+       __atomic_op_fence(atomic64_fetch_andnot, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_andnot_relaxed */
+#endif /* atomic64_andnot */
+
+/* atomic64_fetch_xor_relaxed */
+#ifndef atomic64_fetch_xor_relaxed
+#define atomic64_fetch_xor_relaxed     atomic64_fetch_xor
+#define atomic64_fetch_xor_acquire     atomic64_fetch_xor
+#define atomic64_fetch_xor_release     atomic64_fetch_xor
+
+#else /* atomic64_fetch_xor_relaxed */
+
+#ifndef atomic64_fetch_xor_acquire
+#define atomic64_fetch_xor_acquire(...)                                        \
+       __atomic_op_acquire(atomic64_fetch_xor, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_xor_release
+#define atomic64_fetch_xor_release(...)                                        \
+       __atomic_op_release(atomic64_fetch_xor, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_fetch_xor
+#define atomic64_fetch_xor(...)                                                \
+       __atomic_op_fence(atomic64_fetch_xor, __VA_ARGS__)
+#endif
+#endif /* atomic64_fetch_xor_relaxed */
+
+
 /* atomic64_xchg_relaxed */
 #ifndef atomic64_xchg_relaxed
 #define  atomic64_xchg_relaxed         atomic64_xchg
@@ -588,6 +904,26 @@ static inline void atomic64_andnot(long long i, atomic64_t *v)
 {
        atomic64_and(~i, v);
 }
+
+static inline long long atomic64_fetch_andnot(long long i, atomic64_t *v)
+{
+       return atomic64_fetch_and(~i, v);
+}
+
+static inline long long atomic64_fetch_andnot_relaxed(long long i, atomic64_t *v)
+{
+       return atomic64_fetch_and_relaxed(~i, v);
+}
+
+static inline long long atomic64_fetch_andnot_acquire(long long i, atomic64_t *v)
+{
+       return atomic64_fetch_and_acquire(~i, v);
+}
+
+static inline long long atomic64_fetch_andnot_release(long long i, atomic64_t *v)
+{
+       return atomic64_fetch_and_release(~i, v);
+}
 #endif
 
 #include <asm-generic/atomic-long.h>

diff --git a/lib/atomic64.c b/lib/atomic64.c
index 2886ebac656772c8f77fe26f01d95175e0c18142..53c2d5edc826d4dd322e1623c3aa04297b762a2b 100644 (file)
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -96,17 +96,41 @@ long long atomic64_##op##_return(long long a, atomic64_t *v)                \
 }                                                                      \
 EXPORT_SYMBOL(atomic64_##op##_return);
 
+#define ATOMIC64_FETCH_OP(op, c_op)                                    \
+long long atomic64_fetch_##op(long long a, atomic64_t *v)              \
+{                                                                      \
+       unsigned long flags;                                            \
+       raw_spinlock_t *lock = lock_addr(v);                            \
+       long long val;                                                  \
+                                                                       \
+       raw_spin_lock_irqsave(lock, flags);                             \
+       val = v->counter;                                               \
+       v->counter c_op a;                                              \
+       raw_spin_unlock_irqrestore(lock, flags);                        \
+       return val;                                                     \
+}                                                                      \
+EXPORT_SYMBOL(atomic64_fetch_##op);
+
 #define ATOMIC64_OPS(op, c_op)                                         \
        ATOMIC64_OP(op, c_op)                                           \
-       ATOMIC64_OP_RETURN(op, c_op)
+       ATOMIC64_OP_RETURN(op, c_op)                                    \
+       ATOMIC64_FETCH_OP(op, c_op)
 
 ATOMIC64_OPS(add, +=)
 ATOMIC64_OPS(sub, -=)
-ATOMIC64_OP(and, &=)
-ATOMIC64_OP(or, |=)
-ATOMIC64_OP(xor, ^=)
 
 #undef ATOMIC64_OPS
+#define ATOMIC64_OPS(op, c_op)                                         \
+       ATOMIC64_OP(op, c_op)                                           \
+       ATOMIC64_OP_RETURN(op, c_op)                                    \
+       ATOMIC64_FETCH_OP(op, c_op)
+
+ATOMIC64_OPS(and, &=)
+ATOMIC64_OPS(or, |=)
+ATOMIC64_OPS(xor, ^=)
+
+#undef ATOMIC64_OPS
+#undef ATOMIC64_FETCH_OP
 #undef ATOMIC64_OP_RETURN
 #undef ATOMIC64_OP
 

diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 1234818143204a754ec6df5ae8073107c5171dc5..dbb369145dda4665773f7f964b95a021b6d9a06d 100644 (file)
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -53,11 +53,25 @@ do {                                                                \
        BUG_ON(atomic##bit##_read(&v) != r);                    \
 } while (0)
 
+#define TEST_FETCH(bit, op, c_op, val)                         \
+do {                                                           \
+       atomic##bit##_set(&v, v0);                              \
+       r = v0;                                                 \
+       r c_op val;                                             \
+       BUG_ON(atomic##bit##_##op(val, &v) != v0);              \
+       BUG_ON(atomic##bit##_read(&v) != r);                    \
+} while (0)
+
 #define RETURN_FAMILY_TEST(bit, op, c_op, val)                 \
 do {                                                           \
        FAMILY_TEST(TEST_RETURN, bit, op, c_op, val);           \
 } while (0)
 
+#define FETCH_FAMILY_TEST(bit, op, c_op, val)                  \
+do {                                                           \
+       FAMILY_TEST(TEST_FETCH, bit, op, c_op, val);            \
+} while (0)
+
 #define TEST_ARGS(bit, op, init, ret, expect, args...)         \
 do {                                                           \
        atomic##bit##_set(&v, init);                            \
@@ -114,6 +128,16 @@ static __init void test_atomic(void)
        RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
        RETURN_FAMILY_TEST(, sub_return, -=, -one);
 
+       FETCH_FAMILY_TEST(, fetch_add, +=, onestwos);
+       FETCH_FAMILY_TEST(, fetch_add, +=, -one);
+       FETCH_FAMILY_TEST(, fetch_sub, -=, onestwos);
+       FETCH_FAMILY_TEST(, fetch_sub, -=, -one);
+
+       FETCH_FAMILY_TEST(, fetch_or,  |=, v1);
+       FETCH_FAMILY_TEST(, fetch_and, &=, v1);
+       FETCH_FAMILY_TEST(, fetch_andnot, &= ~, v1);
+       FETCH_FAMILY_TEST(, fetch_xor, ^=, v1);
+
        INC_RETURN_FAMILY_TEST(, v0);
        DEC_RETURN_FAMILY_TEST(, v0);
 
@@ -154,6 +178,16 @@ static __init void test_atomic64(void)
        RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
        RETURN_FAMILY_TEST(64, sub_return, -=, -one);
 
+       FETCH_FAMILY_TEST(64, fetch_add, +=, onestwos);
+       FETCH_FAMILY_TEST(64, fetch_add, +=, -one);
+       FETCH_FAMILY_TEST(64, fetch_sub, -=, onestwos);
+       FETCH_FAMILY_TEST(64, fetch_sub, -=, -one);
+
+       FETCH_FAMILY_TEST(64, fetch_or,  |=, v1);
+       FETCH_FAMILY_TEST(64, fetch_and, &=, v1);
+       FETCH_FAMILY_TEST(64, fetch_andnot, &= ~, v1);
+       FETCH_FAMILY_TEST(64, fetch_xor, ^=, v1);
+
        INIT(v0);
        atomic64_inc(&v);
        r += one;