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 24 typedef 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. */ 62 typedef 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 */ 98