| /* |
| * Atomic operations that C can't guarantee us. Useful for |
| * resource counting etc.. |
| * |
| * But use these as seldom as possible since they are much more slower |
| * than regular operations. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1996, 97, 99, 2000, 03, 04, 06 by Ralf Baechle |
| */ |
| #ifndef _ASM_ATOMIC_H |
| #define _ASM_ATOMIC_H |
| |
| #include <linux/irqflags.h> |
| #include <asm/barrier.h> |
| #include <asm/cpu-features.h> |
| #include <asm/war.h> |
| |
| typedef struct { volatile int counter; } atomic_t; |
| |
| #define ATOMIC_INIT(i) { (i) } |
| |
| /* |
| * atomic_read - read atomic variable |
| * @v: pointer of type atomic_t |
| * |
| * Atomically reads the value of @v. |
| */ |
| #define atomic_read(v) ((v)->counter) |
| |
| /* |
| * atomic_set - set atomic variable |
| * @v: pointer of type atomic_t |
| * @i: required value |
| * |
| * Atomically sets the value of @v to @i. |
| */ |
| #define atomic_set(v,i) ((v)->counter = (i)) |
| |
| /* |
| * atomic_add - add integer to atomic variable |
| * @i: integer value to add |
| * @v: pointer of type atomic_t |
| * |
| * Atomically adds @i to @v. |
| */ |
| static __inline__ void atomic_add(int i, atomic_t * v) |
| { |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %0, %1 # atomic_add \n" |
| " addu %0, %2 \n" |
| " sc %0, %1 \n" |
| " beqzl %0, 1b \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %0, %1 # atomic_add \n" |
| " addu %0, %2 \n" |
| " sc %0, %1 \n" |
| " beqz %0, 2f \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| v->counter += i; |
| raw_local_irq_restore(flags); |
| } |
| } |
| |
| /* |
| * atomic_sub - subtract the atomic variable |
| * @i: integer value to subtract |
| * @v: pointer of type atomic_t |
| * |
| * Atomically subtracts @i from @v. |
| */ |
| static __inline__ void atomic_sub(int i, atomic_t * v) |
| { |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %0, %1 # atomic_sub \n" |
| " subu %0, %2 \n" |
| " sc %0, %1 \n" |
| " beqzl %0, 1b \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %0, %1 # atomic_sub \n" |
| " subu %0, %2 \n" |
| " sc %0, %1 \n" |
| " beqz %0, 2f \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| v->counter -= i; |
| raw_local_irq_restore(flags); |
| } |
| } |
| |
| /* |
| * Same as above, but return the result value |
| */ |
| static __inline__ int atomic_add_return(int i, atomic_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_add_return \n" |
| " addu %0, %1, %3 \n" |
| " sc %0, %2 \n" |
| " beqzl %0, 1b \n" |
| " addu %0, %1, %3 \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_add_return \n" |
| " addu %0, %1, %3 \n" |
| " sc %0, %2 \n" |
| " beqz %0, 2f \n" |
| " addu %0, %1, %3 \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result += i; |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| static __inline__ int atomic_sub_return(int i, atomic_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_sub_return \n" |
| " subu %0, %1, %3 \n" |
| " sc %0, %2 \n" |
| " beqzl %0, 1b \n" |
| " subu %0, %1, %3 \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_sub_return \n" |
| " subu %0, %1, %3 \n" |
| " sc %0, %2 \n" |
| " beqz %0, 2f \n" |
| " subu %0, %1, %3 \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result -= i; |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| /* |
| * atomic_sub_if_positive - conditionally subtract integer from atomic variable |
| * @i: integer value to subtract |
| * @v: pointer of type atomic_t |
| * |
| * Atomically test @v and subtract @i if @v is greater or equal than @i. |
| * The function returns the old value of @v minus @i. |
| */ |
| static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_sub_if_positive\n" |
| " subu %0, %1, %3 \n" |
| " bltz %0, 1f \n" |
| " sc %0, %2 \n" |
| " .set noreorder \n" |
| " beqzl %0, 1b \n" |
| " subu %0, %1, %3 \n" |
| " .set reorder \n" |
| "1: \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: ll %1, %2 # atomic_sub_if_positive\n" |
| " subu %0, %1, %3 \n" |
| " bltz %0, 1f \n" |
| " sc %0, %2 \n" |
| " .set noreorder \n" |
| " beqz %0, 2f \n" |
| " subu %0, %1, %3 \n" |
| " .set reorder \n" |
| "1: \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result -= i; |
| if (result >= 0) |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
| #define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) |
| |
| /** |
| * atomic_add_unless - add unless the number is a given value |
| * @v: pointer of type atomic_t |
| * @a: the amount to add to v... |
| * @u: ...unless v is equal to u. |
| * |
| * Atomically adds @a to @v, so long as it was not @u. |
| * Returns non-zero if @v was not @u, and zero otherwise. |
| */ |
| #define atomic_add_unless(v, a, u) \ |
| ({ \ |
| __typeof__((v)->counter) c, old; \ |
| c = atomic_read(v); \ |
| while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ |
| c = old; \ |
| c != (u); \ |
| }) |
| #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| |
| #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| #define atomic_inc_return(v) atomic_add_return(1,(v)) |
| |
| /* |
| * atomic_sub_and_test - subtract value from variable and test result |
| * @i: integer value to subtract |
| * @v: pointer of type atomic_t |
| * |
| * Atomically subtracts @i from @v and returns |
| * true if the result is zero, or false for all |
| * other cases. |
| */ |
| #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| |
| /* |
| * atomic_inc_and_test - increment and test |
| * @v: pointer of type atomic_t |
| * |
| * Atomically increments @v by 1 |
| * and returns true if the result is zero, or false for all |
| * other cases. |
| */ |
| #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| |
| /* |
| * atomic_dec_and_test - decrement by 1 and test |
| * @v: pointer of type atomic_t |
| * |
| * Atomically decrements @v by 1 and |
| * returns true if the result is 0, or false for all other |
| * cases. |
| */ |
| #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
| |
| /* |
| * atomic_dec_if_positive - decrement by 1 if old value positive |
| * @v: pointer of type atomic_t |
| */ |
| #define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v) |
| |
| /* |
| * atomic_inc - increment atomic variable |
| * @v: pointer of type atomic_t |
| * |
| * Atomically increments @v by 1. |
| */ |
| #define atomic_inc(v) atomic_add(1,(v)) |
| |
| /* |
| * atomic_dec - decrement and test |
| * @v: pointer of type atomic_t |
| * |
| * Atomically decrements @v by 1. |
| */ |
| #define atomic_dec(v) atomic_sub(1,(v)) |
| |
| /* |
| * atomic_add_negative - add and test if negative |
| * @v: pointer of type atomic_t |
| * @i: integer value to add |
| * |
| * Atomically adds @i to @v and returns true |
| * if the result is negative, or false when |
| * result is greater than or equal to zero. |
| */ |
| #define atomic_add_negative(i,v) (atomic_add_return(i, (v)) < 0) |
| |
| #ifdef CONFIG_64BIT |
| |
| typedef struct { volatile long counter; } atomic64_t; |
| |
| #define ATOMIC64_INIT(i) { (i) } |
| |
| /* |
| * atomic64_read - read atomic variable |
| * @v: pointer of type atomic64_t |
| * |
| */ |
| #define atomic64_read(v) ((v)->counter) |
| |
| /* |
| * atomic64_set - set atomic variable |
| * @v: pointer of type atomic64_t |
| * @i: required value |
| */ |
| #define atomic64_set(v,i) ((v)->counter = (i)) |
| |
| /* |
| * atomic64_add - add integer to atomic variable |
| * @i: integer value to add |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically adds @i to @v. |
| */ |
| static __inline__ void atomic64_add(long i, atomic64_t * v) |
| { |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %0, %1 # atomic64_add \n" |
| " addu %0, %2 \n" |
| " scd %0, %1 \n" |
| " beqzl %0, 1b \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %0, %1 # atomic64_add \n" |
| " addu %0, %2 \n" |
| " scd %0, %1 \n" |
| " beqz %0, 2f \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| v->counter += i; |
| raw_local_irq_restore(flags); |
| } |
| } |
| |
| /* |
| * atomic64_sub - subtract the atomic variable |
| * @i: integer value to subtract |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically subtracts @i from @v. |
| */ |
| static __inline__ void atomic64_sub(long i, atomic64_t * v) |
| { |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %0, %1 # atomic64_sub \n" |
| " subu %0, %2 \n" |
| " scd %0, %1 \n" |
| " beqzl %0, 1b \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %0, %1 # atomic64_sub \n" |
| " subu %0, %2 \n" |
| " scd %0, %1 \n" |
| " beqz %0, 2f \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter)); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| v->counter -= i; |
| raw_local_irq_restore(flags); |
| } |
| } |
| |
| /* |
| * Same as above, but return the result value |
| */ |
| static __inline__ long atomic64_add_return(long i, atomic64_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_add_return \n" |
| " addu %0, %1, %3 \n" |
| " scd %0, %2 \n" |
| " beqzl %0, 1b \n" |
| " addu %0, %1, %3 \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_add_return \n" |
| " addu %0, %1, %3 \n" |
| " scd %0, %2 \n" |
| " beqz %0, 2f \n" |
| " addu %0, %1, %3 \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result += i; |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| static __inline__ long atomic64_sub_return(long i, atomic64_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_sub_return \n" |
| " subu %0, %1, %3 \n" |
| " scd %0, %2 \n" |
| " beqzl %0, 1b \n" |
| " subu %0, %1, %3 \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_sub_return \n" |
| " subu %0, %1, %3 \n" |
| " scd %0, %2 \n" |
| " beqz %0, 2f \n" |
| " subu %0, %1, %3 \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result -= i; |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| /* |
| * atomic64_sub_if_positive - conditionally subtract integer from atomic variable |
| * @i: integer value to subtract |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically test @v and subtract @i if @v is greater or equal than @i. |
| * The function returns the old value of @v minus @i. |
| */ |
| static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v) |
| { |
| unsigned long result; |
| |
| smp_mb(); |
| |
| if (cpu_has_llsc && R10000_LLSC_WAR) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_sub_if_positive\n" |
| " dsubu %0, %1, %3 \n" |
| " bltz %0, 1f \n" |
| " scd %0, %2 \n" |
| " .set noreorder \n" |
| " beqzl %0, 1b \n" |
| " dsubu %0, %1, %3 \n" |
| " .set reorder \n" |
| "1: \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else if (cpu_has_llsc) { |
| unsigned long temp; |
| |
| __asm__ __volatile__( |
| " .set mips3 \n" |
| "1: lld %1, %2 # atomic64_sub_if_positive\n" |
| " dsubu %0, %1, %3 \n" |
| " bltz %0, 1f \n" |
| " scd %0, %2 \n" |
| " .set noreorder \n" |
| " beqz %0, 2f \n" |
| " dsubu %0, %1, %3 \n" |
| " .set reorder \n" |
| "1: \n" |
| " .subsection 2 \n" |
| "2: b 1b \n" |
| " .previous \n" |
| " .set mips0 \n" |
| : "=&r" (result), "=&r" (temp), "=m" (v->counter) |
| : "Ir" (i), "m" (v->counter) |
| : "memory"); |
| } else { |
| unsigned long flags; |
| |
| raw_local_irq_save(flags); |
| result = v->counter; |
| result -= i; |
| if (result >= 0) |
| v->counter = result; |
| raw_local_irq_restore(flags); |
| } |
| |
| smp_mb(); |
| |
| return result; |
| } |
| |
| #define atomic64_cmpxchg(v, o, n) \ |
| (((__typeof__((v)->counter)))cmpxchg(&((v)->counter), (o), (n))) |
| #define atomic64_xchg(v, new) (xchg(&((v)->counter), (new))) |
| |
| /** |
| * atomic64_add_unless - add unless the number is a given value |
| * @v: pointer of type atomic64_t |
| * @a: the amount to add to v... |
| * @u: ...unless v is equal to u. |
| * |
| * Atomically adds @a to @v, so long as it was not @u. |
| * Returns non-zero if @v was not @u, and zero otherwise. |
| */ |
| #define atomic64_add_unless(v, a, u) \ |
| ({ \ |
| __typeof__((v)->counter) c, old; \ |
| c = atomic_read(v); \ |
| while (c != (u) && (old = atomic64_cmpxchg((v), c, c + (a))) != c) \ |
| c = old; \ |
| c != (u); \ |
| }) |
| #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
| |
| #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) |
| #define atomic64_inc_return(v) atomic64_add_return(1,(v)) |
| |
| /* |
| * atomic64_sub_and_test - subtract value from variable and test result |
| * @i: integer value to subtract |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically subtracts @i from @v and returns |
| * true if the result is zero, or false for all |
| * other cases. |
| */ |
| #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) |
| |
| /* |
| * atomic64_inc_and_test - increment and test |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically increments @v by 1 |
| * and returns true if the result is zero, or false for all |
| * other cases. |
| */ |
| #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| |
| /* |
| * atomic64_dec_and_test - decrement by 1 and test |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically decrements @v by 1 and |
| * returns true if the result is 0, or false for all other |
| * cases. |
| */ |
| #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) |
| |
| /* |
| * atomic64_dec_if_positive - decrement by 1 if old value positive |
| * @v: pointer of type atomic64_t |
| */ |
| #define atomic64_dec_if_positive(v) atomic64_sub_if_positive(1, v) |
| |
| /* |
| * atomic64_inc - increment atomic variable |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically increments @v by 1. |
| */ |
| #define atomic64_inc(v) atomic64_add(1,(v)) |
| |
| /* |
| * atomic64_dec - decrement and test |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically decrements @v by 1. |
| */ |
| #define atomic64_dec(v) atomic64_sub(1,(v)) |
| |
| /* |
| * atomic64_add_negative - add and test if negative |
| * @v: pointer of type atomic64_t |
| * @i: integer value to add |
| * |
| * Atomically adds @i to @v and returns true |
| * if the result is negative, or false when |
| * result is greater than or equal to zero. |
| */ |
| #define atomic64_add_negative(i,v) (atomic64_add_return(i, (v)) < 0) |
| |
| #endif /* CONFIG_64BIT */ |
| |
| /* |
| * atomic*_return operations are serializing but not the non-*_return |
| * versions. |
| */ |
| #define smp_mb__before_atomic_dec() smp_mb() |
| #define smp_mb__after_atomic_dec() smp_mb() |
| #define smp_mb__before_atomic_inc() smp_mb() |
| #define smp_mb__after_atomic_inc() smp_mb() |
| |
| #include <asm-generic/atomic.h> |
| #endif /* _ASM_ATOMIC_H */ |