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Edit File: local.h

/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_GENERIC_LOCAL_H #define _ASM_GENERIC_LOCAL_H #include <linux/percpu.h> #include <linux/atomic.h> #include <asm/types.h> /* * A signed long type for operations which are atomic for a single CPU. * Usually used in combination with per-cpu variables. * * This is the default implementation, which uses atomic_long_t. Which is * rather pointless. The whole point behind local_t is that some processors * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs * running on this CPU. local_t allows exploitation of such capabilities. */ /* Implement in terms of atomics. */ /* Don't use typedef: don't want them to be mixed with atomic_t's. */ typedef struct { atomic_long_t a; } local_t; #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } #define local_read(l) atomic_long_read(&(l)->a) #define local_set(l,i) atomic_long_set((&(l)->a),(i)) #define local_inc(l) atomic_long_inc(&(l)->a) #define local_dec(l) atomic_long_dec(&(l)->a) #define local_add(i,l) atomic_long_add((i),(&(l)->a)) #define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) #define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a)) #define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a) #define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a) #define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a)) #define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a)) #define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a)) #define local_inc_return(l) atomic_long_inc_return(&(l)->a) #define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n)) #define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n)) #define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u)) #define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a) /* Non-atomic variants, ie. preemption disabled and won't be touched * in interrupt, etc. Some archs can optimize this case well. */ #define __local_inc(l) local_set((l), local_read(l) + 1) #define __local_dec(l) local_set((l), local_read(l) - 1) #define __local_add(i,l) local_set((l), local_read(l) + (i)) #define __local_sub(i,l) local_set((l), local_read(l) - (i)) #endif /* _ASM_GENERIC_LOCAL_H */