diff options
Diffstat (limited to 'include/asm-generic/atomic.h')
| -rw-r--r-- | include/asm-generic/atomic.h | 118 |
1 files changed, 29 insertions, 89 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h index 11f96f40f4a7..04b8be9f1a77 100644 --- a/include/asm-generic/atomic.h +++ b/include/asm-generic/atomic.h @@ -1,7 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-or-later */ /* - * Generic C implementation of atomic counter operations. Usable on - * UP systems only. Do not include in machine independent code. + * Generic C implementation of atomic counter operations. Do not include in + * machine independent code. * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) @@ -12,56 +12,39 @@ #include <asm/cmpxchg.h> #include <asm/barrier.h> -/* - * atomic_$op() - $op integer to atomic variable - * @i: integer value to $op - * @v: pointer to the atomic variable - * - * Atomically $ops @i to @v. Does not strictly guarantee a memory-barrier, use - * smp_mb__{before,after}_atomic(). - */ - -/* - * atomic_$op_return() - $op interer to atomic variable and returns the result - * @i: integer value to $op - * @v: pointer to the atomic variable - * - * Atomically $ops @i to @v. Does imply a full memory barrier. - */ - #ifdef CONFIG_SMP /* we can build all atomic primitives from cmpxchg */ #define ATOMIC_OP(op, c_op) \ -static inline void atomic_##op(int i, atomic_t *v) \ +static inline void generic_atomic_##op(int i, atomic_t *v) \ { \ int c, old; \ \ c = v->counter; \ - while ((old = cmpxchg(&v->counter, c, c c_op i)) != c) \ + while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ } #define ATOMIC_OP_RETURN(op, c_op) \ -static inline int atomic_##op##_return(int i, atomic_t *v) \ +static inline int generic_atomic_##op##_return(int i, atomic_t *v) \ { \ int c, old; \ \ c = v->counter; \ - while ((old = cmpxchg(&v->counter, c, c c_op i)) != c) \ + while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ \ return c c_op i; \ } #define ATOMIC_FETCH_OP(op, c_op) \ -static inline int atomic_fetch_##op(int i, atomic_t *v) \ +static inline int generic_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) \ + while ((old = arch_cmpxchg(&v->counter, c, c c_op i)) != c) \ c = old; \ \ return c; \ @@ -72,7 +55,7 @@ static inline int atomic_fetch_##op(int i, atomic_t *v) \ #include <linux/irqflags.h> #define ATOMIC_OP(op, c_op) \ -static inline void atomic_##op(int i, atomic_t *v) \ +static inline void generic_atomic_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ \ @@ -82,7 +65,7 @@ static inline void atomic_##op(int i, atomic_t *v) \ } #define ATOMIC_OP_RETURN(op, c_op) \ -static inline int atomic_##op##_return(int i, atomic_t *v) \ +static inline int generic_atomic_##op##_return(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ @@ -95,7 +78,7 @@ static inline int atomic_##op##_return(int i, atomic_t *v) \ } #define ATOMIC_FETCH_OP(op, c_op) \ -static inline int atomic_fetch_##op(int i, atomic_t *v) \ +static inline int generic_atomic_fetch_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ int ret; \ @@ -110,87 +93,44 @@ static inline int atomic_fetch_##op(int i, atomic_t *v) \ #endif /* CONFIG_SMP */ -#ifndef atomic_add_return ATOMIC_OP_RETURN(add, +) -#endif - -#ifndef atomic_sub_return 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 ATOMIC_FETCH_OP(or, |) -#endif - -#ifndef atomic_fetch_xor ATOMIC_FETCH_OP(xor, ^) -#endif -#ifndef atomic_and +ATOMIC_OP(add, +) +ATOMIC_OP(sub, -) ATOMIC_OP(and, &) -#endif - -#ifndef atomic_or ATOMIC_OP(or, |) -#endif - -#ifndef atomic_xor ATOMIC_OP(xor, ^) -#endif #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP -/* - * Atomic operations that C can't guarantee us. Useful for - * resource counting etc.. - */ - -/** - * atomic_read - read atomic variable - * @v: pointer of type atomic_t - * - * Atomically reads the value of @v. - */ -#ifndef atomic_read -#define atomic_read(v) READ_ONCE((v)->counter) -#endif - -/** - * atomic_set - set atomic variable - * @v: pointer of type atomic_t - * @i: required value - * - * Atomically sets the value of @v to @i. - */ -#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) +#define arch_atomic_add_return generic_atomic_add_return +#define arch_atomic_sub_return generic_atomic_sub_return -#include <linux/irqflags.h> +#define arch_atomic_fetch_add generic_atomic_fetch_add +#define arch_atomic_fetch_sub generic_atomic_fetch_sub +#define arch_atomic_fetch_and generic_atomic_fetch_and +#define arch_atomic_fetch_or generic_atomic_fetch_or +#define arch_atomic_fetch_xor generic_atomic_fetch_xor -static inline void atomic_add(int i, atomic_t *v) -{ - atomic_add_return(i, v); -} +#define arch_atomic_add generic_atomic_add +#define arch_atomic_sub generic_atomic_sub +#define arch_atomic_and generic_atomic_and +#define arch_atomic_or generic_atomic_or +#define arch_atomic_xor generic_atomic_xor -static inline void atomic_sub(int i, atomic_t *v) -{ - atomic_sub_return(i, v); -} +#define arch_atomic_read(v) READ_ONCE((v)->counter) +#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) -#define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) -#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) +#define arch_atomic_xchg(ptr, v) (arch_xchg(&(ptr)->counter, (v))) +#define arch_atomic_cmpxchg(v, old, new) (arch_cmpxchg(&((v)->counter), (old), (new))) #endif /* __ASM_GENERIC_ATOMIC_H */ |