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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758/* 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_try_cmpxchg(l, po, n) atomic_long_try_cmpxchg((&(l)->a), (po), (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 */