X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-alpha%2Fspinlock.h;h=b5f355444fc2466a7ae91adb198b4cacd435f5c6;hb=ec3fc5db881d93617328ebec37f7ac5fa10377e4;hp=1fc53a935e39e1d55f803361431e21658b55794e;hpb=4c4c8ffd303fc76f7b67c85e0aae99bb3995d9cb;p=linux-2.6.git

diff --git a/include/asm-alpha/spinlock.h b/include/asm-alpha/spinlock.h
index 1fc53a935..b5f355444 100644
--- a/include/asm-alpha/spinlock.h
+++ b/include/asm-alpha/spinlock.h
@@ -95,7 +95,7 @@ static inline int _raw_spin_trylock(spinlock_t *lock)
 /***********************************************************/
 
 typedef struct {
-	volatile int write_lock:1, read_counter:31;
+	volatile unsigned int write_lock:1, read_counter:31;
 } /*__attribute__((aligned(32)))*/ rwlock_t;
 
 #define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
@@ -124,7 +124,7 @@ static inline void _raw_write_lock(rwlock_t * lock)
 	"	br	1b\n"
 	".previous"
 	: "=m" (*lock), "=&r" (regx)
-	: "0" (*lock) : "memory");
+	: "m" (*lock) : "memory");
 }
 
 static inline void _raw_read_lock(rwlock_t * lock)
@@ -148,6 +148,29 @@ static inline void _raw_read_lock(rwlock_t * lock)
 }
 #endif /* CONFIG_DEBUG_RWLOCK */
 
+static inline int _raw_write_trylock(rwlock_t * lock)
+{
+	long regx;
+	int success;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%1,%0\n"
+	"	lda	%2,0\n"
+	"	bne	%1,2f\n"
+	"	or	$31,1,%1\n"
+	"	stl_c	%1,%0\n"
+	"	beq	%1,6f\n"
+	"	lda	%2,1\n"
+	"2:	mb\n"
+	".subsection 2\n"
+	"6:	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx), "=&r" (success)
+	: "m" (*lock) : "memory");
+
+	return success;
+}
+
 static inline void _raw_write_unlock(rwlock_t * lock)
 {
 	mb();