1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ARCH_POWERPC_LOCAL_H
3 #define _ARCH_POWERPC_LOCAL_H
5 #ifdef CONFIG_PPC_BOOK3S_64
7 #include <linux/percpu.h>
8 #include <linux/atomic.h>
9 #include <linux/irqflags.h>
11 #include <asm/hw_irq.h>
18 #define LOCAL_INIT(i) { (i) }
20 static __inline__ long local_read(const local_t *l)
22 return READ_ONCE(l->v);
25 static __inline__ void local_set(local_t *l, long i)
30 #define LOCAL_OP(op, c_op) \
31 static __inline__ void local_##op(long i, local_t *l) \
33 unsigned long flags; \
35 powerpc_local_irq_pmu_save(flags); \
37 powerpc_local_irq_pmu_restore(flags); \
40 #define LOCAL_OP_RETURN(op, c_op) \
41 static __inline__ long local_##op##_return(long a, local_t *l) \
44 unsigned long flags; \
46 powerpc_local_irq_pmu_save(flags); \
48 powerpc_local_irq_pmu_restore(flags); \
53 #define LOCAL_OPS(op, c_op) \
55 LOCAL_OP_RETURN(op, c_op)
60 #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
61 #define local_inc_return(l) local_add_return(1LL, l)
62 #define local_inc(l) local_inc_return(l)
65 * local_inc_and_test - increment and test
66 * @l: pointer of type local_t
68 * Atomically increments @l by 1
69 * and returns true if the result is zero, or false for all
72 #define local_inc_and_test(l) (local_inc_return(l) == 0)
74 #define local_dec_return(l) local_sub_return(1LL, l)
75 #define local_dec(l) local_dec_return(l)
76 #define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
77 #define local_dec_and_test(l) (local_dec_return((l)) == 0)
79 static __inline__ long local_cmpxchg(local_t *l, long o, long n)
84 powerpc_local_irq_pmu_save(flags);
88 powerpc_local_irq_pmu_restore(flags);
93 static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n)
97 r = local_cmpxchg(l, o, n);
101 return likely(r == o);
104 static __inline__ long local_xchg(local_t *l, long n)
109 powerpc_local_irq_pmu_save(flags);
112 powerpc_local_irq_pmu_restore(flags);
118 * local_add_unless - add unless the number is already a given value
119 * @l: pointer of type local_t
120 * @a: the amount to add to v...
121 * @u: ...unless v is equal to u.
123 * Atomically adds @a to @l, if @v was not already @u.
124 * Returns true if the addition was done.
126 static __inline__ bool local_add_unless(local_t *l, long a, long u)
131 powerpc_local_irq_pmu_save(flags);
136 powerpc_local_irq_pmu_restore(flags);
141 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
143 /* Use these for per-cpu local_t variables: on some archs they are
144 * much more efficient than these naive implementations. Note they take
145 * a variable, not an address.
148 #define __local_inc(l) ((l)->v++)
149 #define __local_dec(l) ((l)->v++)
150 #define __local_add(i,l) ((l)->v+=(i))
151 #define __local_sub(i,l) ((l)->v-=(i))
153 #else /* CONFIG_PPC64 */
155 #include <asm-generic/local.h>
157 #endif /* CONFIG_PPC64 */
159 #endif /* _ARCH_POWERPC_LOCAL_H */