diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-28 08:33:25 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-28 08:33:25 -0700 |
commit | c32f1a34ff1097110469a240ea4539dc9c101e96 (patch) | |
tree | eda863205e83afe54cbedcf15cdac416cdec2cf5 /arch/sparc/include/asm/atomic_64.h | |
parent | 4f31f3080943c7e3541f07df326f06d598a067d0 (diff) | |
parent | 04d91cb8163f7f946e348b2362a6e5dfa5f06b13 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sparc: Set CONFIG_HAVE_ARCH_TRACEHOOK
sparc: Add task_pt_regs().
sparc: Add call to tracehook_signal_handler().
sparc: Create and use TIF_NOTIFY_RESUME.
sparc: Use tracehook routines in syscall_trace().
sparc64: tracehook: CONFIG_HAVE_ARCH_TRACEHOOK
sparc: Add user_stack_pointer().
sparc64: tracehook_signal_handler
sparc64: tracehook: TIF_NOTIFY_RESUME
sparc: Add asm/syscall.h
sparc64: tracehook syscall
sparc: enable headers_export again
sparc, sparc64: use arch/sparc/include
Diffstat (limited to 'arch/sparc/include/asm/atomic_64.h')
-rw-r--r-- | arch/sparc/include/asm/atomic_64.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h new file mode 100644 index 00000000000..2c71ec4a3b1 --- /dev/null +++ b/arch/sparc/include/asm/atomic_64.h @@ -0,0 +1,128 @@ +/* atomic.h: Thankfully the V9 is at least reasonable for this + * stuff. + * + * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) + */ + +#ifndef __ARCH_SPARC64_ATOMIC__ +#define __ARCH_SPARC64_ATOMIC__ + +#include <linux/types.h> +#include <asm/system.h> + +typedef struct { volatile int counter; } atomic_t; +typedef struct { volatile __s64 counter; } atomic64_t; + +#define ATOMIC_INIT(i) { (i) } +#define ATOMIC64_INIT(i) { (i) } + +#define atomic_read(v) ((v)->counter) +#define atomic64_read(v) ((v)->counter) + +#define atomic_set(v, i) (((v)->counter) = i) +#define atomic64_set(v, i) (((v)->counter) = i) + +extern void atomic_add(int, atomic_t *); +extern void atomic64_add(int, atomic64_t *); +extern void atomic_sub(int, atomic_t *); +extern void atomic64_sub(int, atomic64_t *); + +extern int atomic_add_ret(int, atomic_t *); +extern int atomic64_add_ret(int, atomic64_t *); +extern int atomic_sub_ret(int, atomic_t *); +extern int atomic64_sub_ret(int, atomic64_t *); + +#define atomic_dec_return(v) atomic_sub_ret(1, v) +#define atomic64_dec_return(v) atomic64_sub_ret(1, v) + +#define atomic_inc_return(v) atomic_add_ret(1, v) +#define atomic64_inc_return(v) atomic64_add_ret(1, v) + +#define atomic_sub_return(i, v) atomic_sub_ret(i, v) +#define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) + +#define atomic_add_return(i, v) atomic_add_ret(i, v) +#define atomic64_add_return(i, v) atomic64_add_ret(i, v) + +/* + * 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) +#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) + +#define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) +#define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) + +#define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) +#define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) + +#define atomic_inc(v) atomic_add(1, v) +#define atomic64_inc(v) atomic64_add(1, v) + +#define atomic_dec(v) atomic_sub(1, v) +#define atomic64_dec(v) atomic64_sub(1, v) + +#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) +#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) + +#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) +#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline int atomic_add_unless(atomic_t *v, int a, int u) +{ + int c, old; + c = atomic_read(v); + for (;;) { + if (unlikely(c == (u))) + break; + old = atomic_cmpxchg((v), c, c + (a)); + if (likely(old == c)) + break; + c = old; + } + return c != (u); +} + +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + +#define atomic64_cmpxchg(v, o, n) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline int atomic64_add_unless(atomic64_t *v, long a, long u) +{ + long c, old; + c = atomic64_read(v); + for (;;) { + if (unlikely(c == (u))) + break; + old = atomic64_cmpxchg((v), c, c + (a)); + if (likely(old == c)) + break; + c = old; + } + return c != (u); +} + +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) + +/* Atomic operations are already serializing */ +#ifdef CONFIG_SMP +#define smp_mb__before_atomic_dec() membar_storeload_loadload(); +#define smp_mb__after_atomic_dec() membar_storeload_storestore(); +#define smp_mb__before_atomic_inc() membar_storeload_loadload(); +#define smp_mb__after_atomic_inc() membar_storeload_storestore(); +#else +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() +#endif + +#include <asm-generic/atomic.h> +#endif /* !(__ARCH_SPARC64_ATOMIC__) */ |