1 files changed, 36 insertions, 27 deletions

diff --git a/kernel/arch/arm/include/asm/atomic.h b/kernel/arch/arm/include/asm/atomic.h
index e22c11970..9e10c4567 100644
--- a/kernel/arch/arm/include/asm/atomic.h
+++ b/kernel/arch/arm/include/asm/atomic.h
@@ -27,8 +27,8 @@
  * strex/ldrex monitor on some implementations. The reason we can use it for
  * atomic_set() is the clrex or dummy strex done on every exception return.
  */
-#define atomic_read(v)	ACCESS_ONCE((v)->counter)
-#define atomic_set(v,i)	(((v)->counter) = (i))
+#define atomic_read(v)	READ_ONCE((v)->counter)
+#define atomic_set(v,i)	WRITE_ONCE(((v)->counter), (i))
 
 #if __LINUX_ARM_ARCH__ >= 6
 
@@ -57,12 +57,11 @@ static inline void atomic_##op(int i, atomic_t *v)			\
 }									\
 
 #define ATOMIC_OP_RETURN(op, c_op, asm_op)				\
-static inline int atomic_##op##_return(int i, atomic_t *v)		\
+static inline int atomic_##op##_return_relaxed(int i, atomic_t *v)	\
 {									\
 	unsigned long tmp;						\
 	int result;							\
 									\
-	smp_mb();							\
 	prefetchw(&v->counter);						\
 									\
 	__asm__ __volatile__("@ atomic_" #op "_return\n"		\
@@ -75,17 +74,17 @@ static inline int atomic_##op##_return(int i, atomic_t *v)		\
 	: "r" (&v->counter), "Ir" (i)					\
 	: "cc");							\
 									\
-	smp_mb();							\
-									\
 	return result;							\
 }
 
-static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
+#define atomic_add_return_relaxed	atomic_add_return_relaxed
+#define atomic_sub_return_relaxed	atomic_sub_return_relaxed
+
+static inline int atomic_cmpxchg_relaxed(atomic_t *ptr, int old, int new)
 {
 	int oldval;
 	unsigned long res;
 
-	smp_mb();
 	prefetchw(&ptr->counter);
 
 	do {
@@ -99,10 +98,9 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
 		    : "cc");
 	} while (res);
 
-	smp_mb();
-
 	return oldval;
 }
+#define atomic_cmpxchg_relaxed		atomic_cmpxchg_relaxed
 
 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 {
@@ -194,6 +192,13 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 ATOMIC_OPS(add, +=, add)
 ATOMIC_OPS(sub, -=, sub)
 
+#define atomic_andnot atomic_andnot
+
+ATOMIC_OP(and, &=, and)
+ATOMIC_OP(andnot, &= ~, bic)
+ATOMIC_OP(or,  |=, orr)
+ATOMIC_OP(xor, ^=, eor)
+
 #undef ATOMIC_OPS
 #undef ATOMIC_OP_RETURN
 #undef ATOMIC_OP
@@ -205,8 +210,8 @@ ATOMIC_OPS(sub, -=, sub)
 
 #define atomic_inc_and_test(v)	(atomic_add_return(1, v) == 0)
 #define atomic_dec_and_test(v)	(atomic_sub_return(1, v) == 0)
-#define atomic_inc_return(v)    (atomic_add_return(1, v))
-#define atomic_dec_return(v)    (atomic_sub_return(1, v))
+#define atomic_inc_return_relaxed(v)    (atomic_add_return_relaxed(1, v))
+#define atomic_dec_return_relaxed(v)    (atomic_sub_return_relaxed(1, v))
 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
 
 #define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
@@ -290,12 +295,12 @@ static inline void atomic64_##op(long long i, atomic64_t *v)		\
 }									\
 
 #define ATOMIC64_OP_RETURN(op, op1, op2)				\
-static inline long long atomic64_##op##_return(long long i, atomic64_t *v) \
+static inline long long							\
+atomic64_##op##_return_relaxed(long long i, atomic64_t *v)		\
 {									\
 	long long result;						\
 	unsigned long tmp;						\
 									\
-	smp_mb();							\
 	prefetchw(&v->counter);						\
 									\
 	__asm__ __volatile__("@ atomic64_" #op "_return\n"		\
@@ -309,8 +314,6 @@ static inline long long atomic64_##op##_return(long long i, atomic64_t *v) \
 	: "r" (&v->counter), "r" (i)					\
 	: "cc");							\
 									\
-	smp_mb();							\
-									\
 	return result;							\
 }
 
@@ -321,17 +324,26 @@ static inline long long atomic64_##op##_return(long long i, atomic64_t *v) \
 ATOMIC64_OPS(add, adds, adc)
 ATOMIC64_OPS(sub, subs, sbc)
 
+#define atomic64_add_return_relaxed	atomic64_add_return_relaxed
+#define atomic64_sub_return_relaxed	atomic64_sub_return_relaxed
+
+#define atomic64_andnot atomic64_andnot
+
+ATOMIC64_OP(and, and, and)
+ATOMIC64_OP(andnot, bic, bic)
+ATOMIC64_OP(or,  orr, orr)
+ATOMIC64_OP(xor, eor, eor)
+
 #undef ATOMIC64_OPS
 #undef ATOMIC64_OP_RETURN
 #undef ATOMIC64_OP
 
-static inline long long atomic64_cmpxchg(atomic64_t *ptr, long long old,
-					long long new)
+static inline long long
+atomic64_cmpxchg_relaxed(atomic64_t *ptr, long long old, long long new)
 {
 	long long oldval;
 	unsigned long res;
 
-	smp_mb();
 	prefetchw(&ptr->counter);
 
 	do {
@@ -346,17 +358,15 @@ static inline long long atomic64_cmpxchg(atomic64_t *ptr, long long old,
 		: "cc");
 	} while (res);
 
-	smp_mb();
-
 	return oldval;
 }
+#define atomic64_cmpxchg_relaxed	atomic64_cmpxchg_relaxed
 
-static inline long long atomic64_xchg(atomic64_t *ptr, long long new)
+static inline long long atomic64_xchg_relaxed(atomic64_t *ptr, long long new)
 {
 	long long result;
 	unsigned long tmp;
 
-	smp_mb();
 	prefetchw(&ptr->counter);
 
 	__asm__ __volatile__("@ atomic64_xchg\n"
@@ -368,10 +378,9 @@ static inline long long atomic64_xchg(atomic64_t *ptr, long long new)
 	: "r" (&ptr->counter), "r" (new)
 	: "cc");
 
-	smp_mb();
-
 	return result;
 }
+#define atomic64_xchg_relaxed		atomic64_xchg_relaxed
 
 static inline long long atomic64_dec_if_positive(atomic64_t *v)
 {
@@ -433,11 +442,11 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
 
 #define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)
 #define atomic64_inc(v)			atomic64_add(1LL, (v))
-#define atomic64_inc_return(v)		atomic64_add_return(1LL, (v))
+#define atomic64_inc_return_relaxed(v)	atomic64_add_return_relaxed(1LL, (v))
 #define atomic64_inc_and_test(v)	(atomic64_inc_return(v) == 0)
 #define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)
 #define atomic64_dec(v)			atomic64_sub(1LL, (v))
-#define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))
+#define atomic64_dec_return_relaxed(v)	atomic64_sub_return_relaxed(1LL, (v))
 #define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)
 #define atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1LL, 0LL)