local64.h (3887B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_GENERIC_LOCAL64_H 3#define _ASM_GENERIC_LOCAL64_H 4 5#include <linux/percpu.h> 6#include <asm/types.h> 7 8/* 9 * A signed long type for operations which are atomic for a single CPU. 10 * Usually used in combination with per-cpu variables. 11 * 12 * This is the default implementation, which uses atomic64_t. Which is 13 * rather pointless. The whole point behind local64_t is that some processors 14 * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs 15 * running on this CPU. local64_t allows exploitation of such capabilities. 16 */ 17 18/* Implement in terms of atomics. */ 19 20#if BITS_PER_LONG == 64 21 22#include <asm/local.h> 23 24typedef struct { 25 local_t a; 26} local64_t; 27 28#define LOCAL64_INIT(i) { LOCAL_INIT(i) } 29 30#define local64_read(l) local_read(&(l)->a) 31#define local64_set(l,i) local_set((&(l)->a),(i)) 32#define local64_inc(l) local_inc(&(l)->a) 33#define local64_dec(l) local_dec(&(l)->a) 34#define local64_add(i,l) local_add((i),(&(l)->a)) 35#define local64_sub(i,l) local_sub((i),(&(l)->a)) 36 37#define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) 38#define local64_dec_and_test(l) local_dec_and_test(&(l)->a) 39#define local64_inc_and_test(l) local_inc_and_test(&(l)->a) 40#define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) 41#define local64_add_return(i, l) local_add_return((i), (&(l)->a)) 42#define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) 43#define local64_inc_return(l) local_inc_return(&(l)->a) 44 45#define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) 46#define local64_xchg(l, n) local_xchg((&(l)->a), (n)) 47#define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) 48#define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) 49 50/* Non-atomic variants, ie. preemption disabled and won't be touched 51 * in interrupt, etc. Some archs can optimize this case well. */ 52#define __local64_inc(l) local64_set((l), local64_read(l) + 1) 53#define __local64_dec(l) local64_set((l), local64_read(l) - 1) 54#define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) 55#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) 56 57#else /* BITS_PER_LONG != 64 */ 58 59#include <linux/atomic.h> 60 61/* Don't use typedef: don't want them to be mixed with atomic_t's. */ 62typedef struct { 63 atomic64_t a; 64} local64_t; 65 66#define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } 67 68#define local64_read(l) atomic64_read(&(l)->a) 69#define local64_set(l,i) atomic64_set((&(l)->a),(i)) 70#define local64_inc(l) atomic64_inc(&(l)->a) 71#define local64_dec(l) atomic64_dec(&(l)->a) 72#define local64_add(i,l) atomic64_add((i),(&(l)->a)) 73#define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) 74 75#define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) 76#define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) 77#define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) 78#define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) 79#define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) 80#define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) 81#define local64_inc_return(l) atomic64_inc_return(&(l)->a) 82 83#define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) 84#define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) 85#define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) 86#define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) 87 88/* Non-atomic variants, ie. preemption disabled and won't be touched 89 * in interrupt, etc. Some archs can optimize this case well. */ 90#define __local64_inc(l) local64_set((l), local64_read(l) + 1) 91#define __local64_dec(l) local64_set((l), local64_read(l) - 1) 92#define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) 93#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) 94 95#endif /* BITS_PER_LONG != 64 */ 96 97#endif /* _ASM_GENERIC_LOCAL64_H */