From: Harvey Harrison Date: Wed, 30 Jan 2008 12:31:26 +0000 (+0100) Subject: x86: unify local_{32|64}.h X-Git-Tag: v2.6.25-rc1~1143^2~553 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5638f99394d478bcba6384ac7c51e763d1a3a448;p=linux-2.6 x86: unify local_{32|64}.h Signed-off-by: Harvey Harrison Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/include/asm-x86/local.h b/include/asm-x86/local.h index c7a1b1c66c..f5677e2086 100644 --- a/include/asm-x86/local.h +++ b/include/asm-x86/local.h @@ -1,5 +1,241 @@ -#ifdef CONFIG_X86_32 -# include "local_32.h" -#else -# include "local_64.h" +#ifndef _ARCH_LOCAL_H +#define _ARCH_LOCAL_H + +#include + +#include +#include +#include + +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 */ diff --git a/include/asm-x86/local_32.h b/include/asm-x86/local_32.h deleted file mode 100644 index c219fe56b3..0000000000 --- a/include/asm-x86/local_32.h +++ /dev/null @@ -1,219 +0,0 @@ -#ifndef _ARCH_I386_LOCAL_H -#define _ARCH_I386_LOCAL_H - -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 of 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 of 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 of 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 - * @l: pointer of type local_t - * @i: integer value to add - * - * 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 - * @l: pointer of type local_t - * @i: integer value to add - * - * 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, these are no better than the atomic variants. */ -#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. - */ - -/* 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_I386_LOCAL_H */ diff --git a/include/asm-x86/local_64.h b/include/asm-x86/local_64.h deleted file mode 100644 index d685cd7e01..0000000000 --- a/include/asm-x86/local_64.h +++ /dev/null @@ -1,207 +0,0 @@ -#ifndef _ARCH_X8664_LOCAL_H -#define _ARCH_X8664_LOCAL_H - -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 = i; - __asm__ __volatile__( - _ASM_XADD "%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) -#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. - * - * 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_X8664_LOCAL_H */