X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-sparc%2Fspinlock.h;h=1c75474ba1df706b1abb5e9c96b50f8fc18dfc5b;hb=20f99dcf417a28089ef6c877ae97f5dec2eab435;hp=111727a2bb4e4f173b89434ddba3f4f00f191c91;hpb=5d54e69c68c05b162a56f9914cae72afd7e6f40a;p=linux-2.6

diff --git a/include/asm-sparc/spinlock.h b/include/asm-sparc/spinlock.h
index 111727a2bb..1c75474ba1 100644
--- a/include/asm-sparc/spinlock.h
+++ b/include/asm-sparc/spinlock.h
@@ -17,7 +17,7 @@
 #define __raw_spin_unlock_wait(lock) \
 	do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
 
-extern __inline__ void __raw_spin_lock(raw_spinlock_t *lock)
+static inline void __raw_spin_lock(raw_spinlock_t *lock)
 {
 	__asm__ __volatile__(
 	"\n1:\n\t"
@@ -37,7 +37,7 @@ extern __inline__ void __raw_spin_lock(raw_spinlock_t *lock)
 	: "g2", "memory", "cc");
 }
 
-extern __inline__ int __raw_spin_trylock(raw_spinlock_t *lock)
+static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 {
 	unsigned int result;
 	__asm__ __volatile__("ldstub [%1], %0"
@@ -47,7 +47,7 @@ extern __inline__ int __raw_spin_trylock(raw_spinlock_t *lock)
 	return (result == 0);
 }
 
-extern __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
+static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 {
 	__asm__ __volatile__("stb %%g0, [%0]" : : "r" (lock) : "memory");
 }
@@ -78,7 +78,7 @@ extern __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
  *
  * Unfortunately this scheme limits us to ~16,000,000 cpus.
  */
-extern __inline__ void __read_lock(raw_rwlock_t *rw)
+static inline void __read_lock(raw_rwlock_t *rw)
 {
 	register raw_rwlock_t *lp asm("g1");
 	lp = rw;
@@ -94,11 +94,11 @@ extern __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)
 
-extern __inline__ void __read_unlock(raw_rwlock_t *rw)
+static inline void __read_unlock(raw_rwlock_t *rw)
 {
 	register raw_rwlock_t *lp asm("g1");
 	lp = rw;
@@ -114,11 +114,11 @@ extern __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 +131,31 @@ 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)
+
+#define __raw_read_can_lock(rw) (!((rw)->lock & 0xff))
+#define __raw_write_can_lock(rw) (!(rw)->lock)
 
 #endif /* !(__ASSEMBLY__) */