#ifndef _ARCH_LOCAL_H #define _ARCH_LOCAL_H #include <linux/percpu.h> #include <asm/system.h> #include <asm/atomic.h> #include <asm/asm.h> 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)) static inline void local_inc(local_t *l) { asm volatile(_ASM_INC "%0" : "+m" (l->a.counter)); } static inline void local_dec(local_t *l) { asm volatile(_ASM_DEC "%0" : "+m" (l->a.counter)); } static inline void local_add(long i, local_t *l) { asm volatile(_ASM_ADD "%1,%0" : "+m" (l->a.counter) : "ir" (i)); } static inline void local_sub(long i, local_t *l) { asm volatile(_ASM_SUB "%1,%0" : "+m" (l->a.counter) : "ir" (i)); } /** * 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(_ASM_SUB "%2,%0; sete %1" : "+m" (l->a.counter), "=qm" (c) : "ir" (i) : "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(_ASM_DEC "%0; sete %1" : "+m" (l->a.counter), "=qm" (c) : : "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(_ASM_INC "%0; sete %1" : "+m" (l->a.counter), "=qm" (c) : : "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(_ASM_ADD "%2,%0; sets %1" : "+m" (l->a.counter), "=qm" (c) : "ir" (i) : "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; #ifdef CONFIG_M386 unsigned long flags; if (unlikely(boot_cpu_data.x86 <= 3)) goto no_xadd; #endif /* Modern 486+ processor */ __i = i; asm volatile(_ASM_XADD "%0, %1;" : "+r" (i), "+m" (l->a.counter) : : "memory"); return i + __i; #ifdef CONFIG_M386 no_xadd: /* Legacy 386 processor */ local_irq_save(flags); __i = local_read(l); local_set(l, i + __i); local_irq_restore(flags); return i + __i; #endif } 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))) /** * local_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_32, these are no better than the atomic variants. * 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) #define __local_dec(l) local_dec(l) #define __local_add(i, l) local_add((i), (l)) #define __local_sub(i, l) local_sub((i), (l)) /* Use these for per-cpu local_t variables: on some archs they are * much more efficient than these naive implementations. Note they take * a variable, not an address. * * X86_64: This could be done better if we moved the per cpu data directly * after GS. */ /* 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(l) \ ({ \ local_t res__; \ preempt_disable(); \ res__ = (l); \ preempt_enable(); \ res__; \ }) #define cpu_local_wrap(l) \ ({ \ preempt_disable(); \ (l); \ preempt_enable(); \ }) \ #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(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_LOCAL_H */