atomic.h
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/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _ASM_GENERIC_ATOMIC_H
#define _ASM_GENERIC_ATOMIC_H
typedef struct { volatile int counter; } atomic_t;
#if BITS_PER_LONG == 32
typedef struct { volatile long long counter; } atomic64_t;
#else /* BIT_PER_LONG == 32 */
typedef struct { volatile long counter; } atomic64_t;
#endif
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v, i) ((v)->counter = (i))
#define atomic64_read(v) atomic_read(v)
#define atomic64_set(v, i) atomic_set(v, i)
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter += i;
local_irq_restore(flags);
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter -= i;
local_irq_restore(flags);
}
static inline void atomic_inc(atomic_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
++v->counter;
local_irq_restore(flags);
}
static inline void atomic_dec(atomic_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
--v->counter;
local_irq_restore(flags);
}
static inline int atomic_dec_and_test(volatile atomic_t *v)
{
unsigned long flags = 0;
int val;
local_irq_save(flags);
val = v->counter;
v->counter = val -= 1;
local_irq_restore(flags);
return val == 0;
}
static inline int atomic_add_negative(int i, volatile atomic_t *v)
{
unsigned long flags = 0;
int val;
local_irq_save(flags);
val = v->counter;
v->counter = val += i;
local_irq_restore(flags);
return val < 0;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
unsigned long flags = 0;
local_irq_save(flags);
*addr &= ~mask;
local_irq_restore(flags);
}
#if BITS_PER_LONG == 32
static inline void atomic64_add(long long i, volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter += i;
local_irq_restore(flags);
}
static inline void atomic64_sub(long long i, volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter -= i;
local_irq_restore(flags);
}
#else /* BIT_PER_LONG == 32 */
static inline void atomic64_add(long i, volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter += i;
local_irq_restore(flags);
}
static inline void atomic64_sub(long i, volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter -= i;
local_irq_restore(flags);
}
#endif
static inline void atomic64_inc(volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter += 1;
local_irq_restore(flags);
}
static inline void atomic64_dec(volatile atomic64_t *v)
{
unsigned long flags = 0;
local_irq_save(flags);
v->counter -= 1;
local_irq_restore(flags);
}
#endif