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Diffstat (limited to 'include/asm-sparc/spinlock.h')
-rw-r--r--include/asm-sparc/spinlock.h25
1 files changed, 22 insertions, 3 deletions
diff --git a/include/asm-sparc/spinlock.h b/include/asm-sparc/spinlock.h
index e344c98a6f5..3350c90c786 100644
--- a/include/asm-sparc/spinlock.h
+++ b/include/asm-sparc/spinlock.h
@@ -94,7 +94,7 @@ static inline void __read_lock(raw_rwlock_t *rw)
#define __raw_read_lock(lock) \
do { unsigned long flags; \
local_irq_save(flags); \
- __raw_read_lock(lock); \
+ __read_lock(lock); \
local_irq_restore(flags); \
} while(0)
@@ -114,11 +114,11 @@ static inline void __read_unlock(raw_rwlock_t *rw)
#define __raw_read_unlock(lock) \
do { unsigned long flags; \
local_irq_save(flags); \
- __raw_read_unlock(lock); \
+ __read_unlock(lock); \
local_irq_restore(flags); \
} while(0)
-extern __inline__ void __raw_write_lock(raw_rwlock_t *rw)
+static inline void __raw_write_lock(raw_rwlock_t *rw)
{
register raw_rwlock_t *lp asm("g1");
lp = rw;
@@ -131,9 +131,28 @@ extern __inline__ void __raw_write_lock(raw_rwlock_t *rw)
: "g2", "g4", "memory", "cc");
}
+static inline int __raw_write_trylock(raw_rwlock_t *rw)
+{
+ unsigned int val;
+
+ __asm__ __volatile__("ldstub [%1 + 3], %0"
+ : "=r" (val)
+ : "r" (&rw->lock)
+ : "memory");
+
+ if (val == 0) {
+ val = rw->lock & ~0xff;
+ if (val)
+ ((volatile u8*)&rw->lock)[3] = 0;
+ }
+
+ return (val == 0);
+}
+
#define __raw_write_unlock(rw) do { (rw)->lock = 0; } while(0)
#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
#endif /* !(__ASSEMBLY__) */