diff options
Diffstat (limited to 'include/asm-x86_64/local.h')
| -rw-r--r-- | include/asm-x86_64/local.h | 196 |
1 files changed, 165 insertions, 31 deletions
diff --git a/include/asm-x86_64/local.h b/include/asm-x86_64/local.h index e769e620022..e87492bb069 100644 --- a/include/asm-x86_64/local.h +++ b/include/asm-x86_64/local.h @@ -2,49 +2,183 @@ #define _ARCH_X8664_LOCAL_H #include <linux/percpu.h> +#include <asm/atomic.h> typedef struct { - volatile long counter; + atomic_long_t a; } local_t; -#define LOCAL_INIT(i) { (i) } +#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } -#define local_read(v) ((v)->counter) -#define local_set(v,i) (((v)->counter) = (i)) +#define local_read(l) atomic_long_read(&(l)->a) +#define local_set(l,i) atomic_long_set(&(l)->a, (i)) -static inline void local_inc(local_t *v) +static inline void local_inc(local_t *l) { __asm__ __volatile__( "incq %0" - :"=m" (v->counter) - :"m" (v->counter)); + :"=m" (l->a.counter) + :"m" (l->a.counter)); } -static inline void local_dec(local_t *v) +static inline void local_dec(local_t *l) { __asm__ __volatile__( "decq %0" - :"=m" (v->counter) - :"m" (v->counter)); + :"=m" (l->a.counter) + :"m" (l->a.counter)); } -static inline void local_add(long i, local_t *v) +static inline void local_add(long i, local_t *l) { __asm__ __volatile__( "addq %1,%0" - :"=m" (v->counter) - :"ir" (i), "m" (v->counter)); + :"=m" (l->a.counter) + :"ir" (i), "m" (l->a.counter)); } -static inline void local_sub(long i, local_t *v) +static inline void local_sub(long i, local_t *l) { __asm__ __volatile__( "subq %1,%0" - :"=m" (v->counter) - :"ir" (i), "m" (v->counter)); + :"=m" (l->a.counter) + :"ir" (i), "m" (l->a.counter)); } +/** + * local_sub_and_test - subtract value from variable and test result + * @i: integer value to subtract + * @l: pointer to type local_t + * + * Atomically subtracts @i from @l and returns + * true if the result is zero, or false for all + * other cases. + */ +static __inline__ int local_sub_and_test(long i, local_t *l) +{ + unsigned char c; + + __asm__ __volatile__( + "subq %2,%0; sete %1" + :"=m" (l->a.counter), "=qm" (c) + :"ir" (i), "m" (l->a.counter) : "memory"); + return c; +} + +/** + * local_dec_and_test - decrement and test + * @l: pointer to type local_t + * + * Atomically decrements @l by 1 and + * returns true if the result is 0, or false for all other + * cases. + */ +static __inline__ int local_dec_and_test(local_t *l) +{ + unsigned char c; + + __asm__ __volatile__( + "decq %0; sete %1" + :"=m" (l->a.counter), "=qm" (c) + :"m" (l->a.counter) : "memory"); + return c != 0; +} + +/** + * local_inc_and_test - increment and test + * @l: pointer to type local_t + * + * Atomically increments @l by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +static __inline__ int local_inc_and_test(local_t *l) +{ + unsigned char c; + + __asm__ __volatile__( + "incq %0; sete %1" + :"=m" (l->a.counter), "=qm" (c) + :"m" (l->a.counter) : "memory"); + return c != 0; +} + +/** + * local_add_negative - add and test if negative + * @i: integer value to add + * @l: pointer to type local_t + * + * Atomically adds @i to @l and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. + */ +static __inline__ int local_add_negative(long i, local_t *l) +{ + unsigned char c; + + __asm__ __volatile__( + "addq %2,%0; sets %1" + :"=m" (l->a.counter), "=qm" (c) + :"ir" (i), "m" (l->a.counter) : "memory"); + return c; +} + +/** + * local_add_return - add and return + * @i: integer value to add + * @l: pointer to type local_t + * + * Atomically adds @i to @l and returns @i + @l + */ +static __inline__ long local_add_return(long i, local_t *l) +{ + long __i = i; + __asm__ __volatile__( + "xaddq %0, %1;" + :"+r" (i), "+m" (l->a.counter) + : : "memory"); + return i + __i; +} + +static __inline__ long local_sub_return(long i, local_t *l) +{ + return local_add_return(-i,l); +} + +#define local_inc_return(l) (local_add_return(1,l)) +#define local_dec_return(l) (local_sub_return(1,l)) + +#define local_cmpxchg(l, o, n) \ + (cmpxchg_local(&((l)->a.counter), (o), (n))) +/* Always has a lock prefix */ +#define local_xchg(l, n) (xchg(&((l)->a.counter), (n))) + +/** + * atomic_up_add_unless - add unless the number is a given value + * @l: pointer of type local_t + * @a: the amount to add to l... + * @u: ...unless l is equal to u. + * + * Atomically adds @a to @l, so long as it was not @u. + * Returns non-zero if @l was not @u, and zero otherwise. + */ +#define local_add_unless(l, a, u) \ +({ \ + long c, old; \ + c = local_read(l); \ + for (;;) { \ + if (unlikely(c == (u))) \ + break; \ + old = local_cmpxchg((l), c, c + (a)); \ + if (likely(old == c)) \ + break; \ + c = old; \ + } \ + c != (u); \ +}) +#define local_inc_not_zero(l) local_add_unless((l), 1, 0) + /* On x86-64 these are better than the atomic variants on SMP kernels because they dont use a lock prefix. */ #define __local_inc(l) local_inc(l) @@ -62,27 +196,27 @@ static inline void local_sub(long i, local_t *v) /* Need to disable preemption for the cpu local counters otherwise we could still access a variable of a previous CPU in a non atomic way. */ -#define cpu_local_wrap_v(v) \ +#define cpu_local_wrap_v(l) \ ({ local_t res__; \ preempt_disable(); \ - res__ = (v); \ + res__ = (l); \ preempt_enable(); \ res__; }) -#define cpu_local_wrap(v) \ +#define cpu_local_wrap(l) \ ({ preempt_disable(); \ - v; \ + l; \ preempt_enable(); }) \ -#define cpu_local_read(v) cpu_local_wrap_v(local_read(&__get_cpu_var(v))) -#define cpu_local_set(v, i) cpu_local_wrap(local_set(&__get_cpu_var(v), (i))) -#define cpu_local_inc(v) cpu_local_wrap(local_inc(&__get_cpu_var(v))) -#define cpu_local_dec(v) cpu_local_wrap(local_dec(&__get_cpu_var(v))) -#define cpu_local_add(i, v) cpu_local_wrap(local_add((i), &__get_cpu_var(v))) -#define cpu_local_sub(i, v) cpu_local_wrap(local_sub((i), &__get_cpu_var(v))) +#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l))) +#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i))) +#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l))) +#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l))) +#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l))) +#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l))) -#define __cpu_local_inc(v) cpu_local_inc(v) -#define __cpu_local_dec(v) cpu_local_dec(v) -#define __cpu_local_add(i, v) cpu_local_add((i), (v)) -#define __cpu_local_sub(i, v) cpu_local_sub((i), (v)) +#define __cpu_local_inc(l) cpu_local_inc(l) +#define __cpu_local_dec(l) cpu_local_dec(l) +#define __cpu_local_add(i, l) cpu_local_add((i), (l)) +#define __cpu_local_sub(i, l) cpu_local_sub((i), (l)) -#endif /* _ARCH_I386_LOCAL_H */ +#endif /* _ARCH_X8664_LOCAL_H */ |