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274 lines
6.6 KiB
274 lines
6.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_ATOMIC_H |
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#define _ASM_X86_ATOMIC_H |
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#include <linux/compiler.h> |
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#include <linux/types.h> |
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#include <asm/alternative.h> |
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#include <asm/cmpxchg.h> |
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#include <asm/rmwcc.h> |
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#include <asm/barrier.h> |
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/* |
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* Atomic operations that C can't guarantee us. Useful for |
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* resource counting etc.. |
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*/ |
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/** |
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* arch_atomic_read - read atomic variable |
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* @v: pointer of type atomic_t |
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* |
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* Atomically reads the value of @v. |
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*/ |
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static __always_inline int arch_atomic_read(const atomic_t *v) |
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{ |
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/* |
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* Note for KASAN: we deliberately don't use READ_ONCE_NOCHECK() here, |
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* it's non-inlined function that increases binary size and stack usage. |
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*/ |
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return __READ_ONCE((v)->counter); |
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} |
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/** |
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* arch_atomic_set - set atomic variable |
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* @v: pointer of type atomic_t |
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* @i: required value |
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* |
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* Atomically sets the value of @v to @i. |
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*/ |
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static __always_inline void arch_atomic_set(atomic_t *v, int i) |
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{ |
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__WRITE_ONCE(v->counter, i); |
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} |
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/** |
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* arch_atomic_add - add integer to atomic variable |
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* @i: integer value to add |
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* @v: pointer of type atomic_t |
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* |
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* Atomically adds @i to @v. |
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*/ |
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static __always_inline void arch_atomic_add(int i, atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "addl %1,%0" |
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: "+m" (v->counter) |
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: "ir" (i) : "memory"); |
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} |
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/** |
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* arch_atomic_sub - subtract integer from atomic variable |
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* @i: integer value to subtract |
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* @v: pointer of type atomic_t |
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* |
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* Atomically subtracts @i from @v. |
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*/ |
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static __always_inline void arch_atomic_sub(int i, atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "subl %1,%0" |
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: "+m" (v->counter) |
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: "ir" (i) : "memory"); |
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} |
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/** |
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* arch_atomic_sub_and_test - subtract value from variable and test result |
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* @i: integer value to subtract |
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* @v: pointer of type atomic_t |
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* |
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* Atomically subtracts @i from @v and returns |
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* true if the result is zero, or false for all |
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* other cases. |
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*/ |
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static __always_inline bool arch_atomic_sub_and_test(int i, atomic_t *v) |
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{ |
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return GEN_BINARY_RMWcc(LOCK_PREFIX "subl", v->counter, e, "er", i); |
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} |
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#define arch_atomic_sub_and_test arch_atomic_sub_and_test |
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/** |
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* arch_atomic_inc - increment atomic variable |
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* @v: pointer of type atomic_t |
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* |
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* Atomically increments @v by 1. |
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*/ |
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static __always_inline void arch_atomic_inc(atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "incl %0" |
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: "+m" (v->counter) :: "memory"); |
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} |
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#define arch_atomic_inc arch_atomic_inc |
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/** |
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* arch_atomic_dec - decrement atomic variable |
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* @v: pointer of type atomic_t |
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* |
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* Atomically decrements @v by 1. |
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*/ |
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static __always_inline void arch_atomic_dec(atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "decl %0" |
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: "+m" (v->counter) :: "memory"); |
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} |
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#define arch_atomic_dec arch_atomic_dec |
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/** |
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* arch_atomic_dec_and_test - decrement and test |
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* @v: pointer of type atomic_t |
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* |
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* Atomically decrements @v by 1 and |
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* returns true if the result is 0, or false for all other |
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* cases. |
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*/ |
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static __always_inline bool arch_atomic_dec_and_test(atomic_t *v) |
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{ |
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return GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, e); |
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} |
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#define arch_atomic_dec_and_test arch_atomic_dec_and_test |
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/** |
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* arch_atomic_inc_and_test - increment and test |
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* @v: pointer of type atomic_t |
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* |
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* Atomically increments @v by 1 |
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* and returns true if the result is zero, or false for all |
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* other cases. |
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*/ |
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static __always_inline bool arch_atomic_inc_and_test(atomic_t *v) |
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{ |
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return GEN_UNARY_RMWcc(LOCK_PREFIX "incl", v->counter, e); |
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} |
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#define arch_atomic_inc_and_test arch_atomic_inc_and_test |
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/** |
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* arch_atomic_add_negative - add and test if negative |
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* @i: integer value to add |
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* @v: pointer of type atomic_t |
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* |
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* Atomically adds @i to @v and returns true |
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* if the result is negative, or false when |
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* result is greater than or equal to zero. |
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*/ |
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static __always_inline bool arch_atomic_add_negative(int i, atomic_t *v) |
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{ |
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return GEN_BINARY_RMWcc(LOCK_PREFIX "addl", v->counter, s, "er", i); |
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} |
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#define arch_atomic_add_negative arch_atomic_add_negative |
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/** |
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* arch_atomic_add_return - add integer and return |
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* @i: integer value to add |
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* @v: pointer of type atomic_t |
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* |
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* Atomically adds @i to @v and returns @i + @v |
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*/ |
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static __always_inline int arch_atomic_add_return(int i, atomic_t *v) |
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{ |
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return i + xadd(&v->counter, i); |
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} |
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#define arch_atomic_add_return arch_atomic_add_return |
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/** |
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* arch_atomic_sub_return - subtract integer and return |
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* @v: pointer of type atomic_t |
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* @i: integer value to subtract |
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* |
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* Atomically subtracts @i from @v and returns @v - @i |
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*/ |
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static __always_inline int arch_atomic_sub_return(int i, atomic_t *v) |
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{ |
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return arch_atomic_add_return(-i, v); |
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} |
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#define arch_atomic_sub_return arch_atomic_sub_return |
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static __always_inline int arch_atomic_fetch_add(int i, atomic_t *v) |
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{ |
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return xadd(&v->counter, i); |
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} |
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#define arch_atomic_fetch_add arch_atomic_fetch_add |
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static __always_inline int arch_atomic_fetch_sub(int i, atomic_t *v) |
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{ |
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return xadd(&v->counter, -i); |
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} |
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#define arch_atomic_fetch_sub arch_atomic_fetch_sub |
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static __always_inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new) |
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{ |
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return arch_cmpxchg(&v->counter, old, new); |
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} |
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#define arch_atomic_cmpxchg arch_atomic_cmpxchg |
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static __always_inline bool arch_atomic_try_cmpxchg(atomic_t *v, int *old, int new) |
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{ |
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return arch_try_cmpxchg(&v->counter, old, new); |
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} |
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#define arch_atomic_try_cmpxchg arch_atomic_try_cmpxchg |
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static __always_inline int arch_atomic_xchg(atomic_t *v, int new) |
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{ |
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return arch_xchg(&v->counter, new); |
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} |
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#define arch_atomic_xchg arch_atomic_xchg |
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static __always_inline void arch_atomic_and(int i, atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "andl %1,%0" |
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: "+m" (v->counter) |
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: "ir" (i) |
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: "memory"); |
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} |
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static __always_inline int arch_atomic_fetch_and(int i, atomic_t *v) |
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{ |
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int val = arch_atomic_read(v); |
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do { } while (!arch_atomic_try_cmpxchg(v, &val, val & i)); |
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return val; |
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} |
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#define arch_atomic_fetch_and arch_atomic_fetch_and |
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static __always_inline void arch_atomic_or(int i, atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "orl %1,%0" |
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: "+m" (v->counter) |
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: "ir" (i) |
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: "memory"); |
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} |
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static __always_inline int arch_atomic_fetch_or(int i, atomic_t *v) |
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{ |
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int val = arch_atomic_read(v); |
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do { } while (!arch_atomic_try_cmpxchg(v, &val, val | i)); |
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return val; |
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} |
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#define arch_atomic_fetch_or arch_atomic_fetch_or |
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static __always_inline void arch_atomic_xor(int i, atomic_t *v) |
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{ |
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asm volatile(LOCK_PREFIX "xorl %1,%0" |
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: "+m" (v->counter) |
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: "ir" (i) |
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: "memory"); |
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} |
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static __always_inline int arch_atomic_fetch_xor(int i, atomic_t *v) |
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{ |
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int val = arch_atomic_read(v); |
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do { } while (!arch_atomic_try_cmpxchg(v, &val, val ^ i)); |
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return val; |
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} |
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#define arch_atomic_fetch_xor arch_atomic_fetch_xor |
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#ifdef CONFIG_X86_32 |
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# include <asm/atomic64_32.h> |
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#else |
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# include <asm/atomic64_64.h> |
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#endif |
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#define ARCH_ATOMIC |
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#endif /* _ASM_X86_ATOMIC_H */
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