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Pull lameter-spinlock-optimization into release branch

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This commit is contained in:
Tony Luck 2005-08-29 11:38:01 -07:00
commit dcf8296216
1 changed files with 24 additions and 9 deletions
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33
include/asm-ia64/spinlock.h
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@ -93,7 +93,15 @@ _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags)
# endif /* CONFIG_MCKINLEY */
#endif
}
#define _raw_spin_lock(lock) _raw_spin_lock_flags(lock, 0)
/* Unlock by doing an ordered store and releasing the cacheline with nta */
static inline void _raw_spin_unlock(spinlock_t *x) {
barrier();
asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(x));
}
#else /* !ASM_SUPPORTED */
#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
# define _raw_spin_lock(x) \
@ -109,16 +117,16 @@ do { \
} while (ia64_spinlock_val); \
} \
} while (0)
#define _raw_spin_unlock(x) do { barrier(); ((spinlock_t *) x)->lock = 0; } while (0)
#endif /* !ASM_SUPPORTED */
#define spin_is_locked(x) ((x)->lock != 0)
#define _raw_spin_unlock(x) do { barrier(); ((spinlock_t *) x)->lock = 0; } while (0)
#define _raw_spin_trylock(x) (cmpxchg_acq(&(x)->lock, 0, 1) == 0)
#define spin_unlock_wait(x) do { barrier(); } while ((x)->lock)
typedef struct {
volatile unsigned int read_counter : 31;
volatile unsigned int write_lock : 1;
volatile unsigned int read_counter : 24;
volatile unsigned int write_lock : 8;
#ifdef CONFIG_PREEMPT
unsigned int break_lock;
#endif
@ -174,6 +182,13 @@ do { \
(result == 0); \
})
static inline void _raw_write_unlock(rwlock_t *x)
{
u8 *y = (u8 *)x;
barrier();
asm volatile ("st1.rel.nta [%0] = r0\n\t" :: "r"(y+3) : "memory" );
}
#else /* !ASM_SUPPORTED */
#define _raw_write_lock(l) \
@ -195,14 +210,14 @@ do { \
(ia64_val == 0); \
})
static inline void _raw_write_unlock(rwlock_t *x)
{
barrier();
x->write_lock = 0;
}
#endif /* !ASM_SUPPORTED */
#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
#define _raw_write_unlock(x) \
({ \
smp_mb__before_clear_bit(); /* need barrier before releasing lock... */ \
clear_bit(31, (x)); \
})
#endif /* _ASM_IA64_SPINLOCK_H */