1 #ifndef _ASM_GENERIC_LOCAL_H 2 #define _ASM_GENERIC_LOCAL_H 3 4 #include <linux/config.h> 5 #include <linux/percpu.h> 6 #include <linux/hardirq.h> 7 #include <asm/atomic.h> 8 #include <asm/types.h> 9 10 /* An unsigned long type for operations which are atomic for a single 11 * CPU. Usually used in combination with per-cpu variables. */ 12 13 /* Implement in terms of atomics. */ 14 15 /* Don't use typedef: don't want them to be mixed with atomic_t's. */ 16 typedef struct 17 { 18 atomic_long_t a; 19 } local_t; 20 21 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } 22 23 #define local_read(l) ((unsigned long)atomic_long_read(&(l)->a)) 24 #define local_set(l,i) atomic_long_set((&(l)->a),(i)) 25 #define local_inc(l) atomic_long_inc(&(l)->a) 26 #define local_dec(l) atomic_long_dec(&(l)->a) 27 #define local_add(i,l) atomic_long_add((i),(&(l)->a)) 28 #define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) 29 30 /* Non-atomic variants, ie. preemption disabled and won't be touched 31 * in interrupt, etc. Some archs can optimize this case well. */ 32 #define __local_inc(l) local_set((l), local_read(l) + 1) 33 #define __local_dec(l) local_set((l), local_read(l) - 1) 34 #define __local_add(i,l) local_set((l), local_read(l) + (i)) 35 #define __local_sub(i,l) local_set((l), local_read(l) - (i)) 36 37 /* Use these for per-cpu local_t variables: on some archs they are 38 * much more efficient than these naive implementations. Note they take 39 * a variable (eg. mystruct.foo), not an address. 40 */ 41 #define cpu_local_read(v) local_read(&__get_cpu_var(v)) 42 #define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i)) 43 #define cpu_local_inc(v) local_inc(&__get_cpu_var(v)) 44 #define cpu_local_dec(v) local_dec(&__get_cpu_var(v)) 45 #define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v)) 46 #define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v)) 47 48 /* Non-atomic increments, ie. preemption disabled and won't be touched 49 * in interrupt, etc. Some archs can optimize this case well. 50 */ 51 #define __cpu_local_inc(v) __local_inc(&__get_cpu_var(v)) 52 #define __cpu_local_dec(v) __local_dec(&__get_cpu_var(v)) 53 #define __cpu_local_add(i, v) __local_add((i), &__get_cpu_var(v)) 54 #define __cpu_local_sub(i, v) __local_sub((i), &__get_cpu_var(v)) 55 56 #endif /* _ASM_GENERIC_LOCAL_H */ 57