1 files changed, 31 insertions, 17 deletions

diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h
index 11efa474865b..d1f91a4f24ae 100644
--- a/include/asm-sparc64/spinlock.h
+++ b/include/asm-sparc64/spinlock.h
@@ -31,15 +31,20 @@
 
 #ifndef CONFIG_DEBUG_SPINLOCK
 
-typedef unsigned char spinlock_t;
-#define SPIN_LOCK_UNLOCKED      0
+typedef struct {
+        volatile unsigned char lock;
+#ifdef CONFIG_PREEMPT
+        unsigned int break_lock;
+#endif
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED      (spinlock_t) {0,}
 
-#define spin_lock_init(lock)    (*((unsigned char *)(lock)) = 0)
-#define spin_is_locked(lock)    (*((volatile unsigned char *)(lock)) != 0)
+#define spin_lock_init(lp)      do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0)
+#define spin_is_locked(lp)  ((lp)->lock != 0)
 
-#define spin_unlock_wait(lock)  \
+#define spin_unlock_wait(lp)    \
 do {    membar("#LoadLoad");    \
-} while(*((volatile unsigned char *)lock))
+} while(lp->lock)
 
 static inline void _raw_spin_lock(spinlock_t *lock)
 {
@@ -109,20 +114,19 @@ static inline void _raw_spin_lock_flags(spinlock_t *lock, unsigned long flags)
 #else /* !(CONFIG_DEBUG_SPINLOCK) */
 
 typedef struct {
-        unsigned char lock;
+        volatile unsigned char lock;
         unsigned int owner_pc, owner_cpu;
+#ifdef CONFIG_PREEMPT
+        unsigned int break_lock;
+#endif
 } spinlock_t;
 #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, 0xff }
-#define spin_lock_init(__lock)  \
-do {    (__lock)->lock = 0; \
-        (__lock)->owner_pc = 0; \
-        (__lock)->owner_cpu = 0xff; \
-} while(0)
-#define spin_is_locked(__lock)  (*((volatile unsigned char *)(&((__lock)->lock))) != 0)
+#define spin_lock_init(lp)      do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0)
+#define spin_is_locked(__lock)  ((__lock)->lock != 0)
 #define spin_unlock_wait(__lock)        \
 do { \
         membar("#LoadLoad"); \
-} while(*((volatile unsigned char *)(&((__lock)->lock))))
+} while((__lock)->lock)
 
 extern void _do_spin_lock (spinlock_t *lock, char *str);
 extern void _do_spin_unlock (spinlock_t *lock);
@@ -139,8 +143,13 @@ extern int _do_spin_trylock (spinlock_t *lock);
 
 #ifndef CONFIG_DEBUG_SPINLOCK
 
-typedef unsigned int rwlock_t;
-#define RW_LOCK_UNLOCKED        0
+typedef struct {
+        volatile unsigned int lock;
+#ifdef CONFIG_PREEMPT
+        unsigned int break_lock;
+#endif
+} rwlock_t;
+#define RW_LOCK_UNLOCKED        {0,}
 #define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
 
 static void inline __read_lock(rwlock_t *lock)
@@ -251,9 +260,12 @@ static int inline __write_trylock(rwlock_t *lock)
 #else /* !(CONFIG_DEBUG_SPINLOCK) */
 
 typedef struct {
-        unsigned long lock;
+        volatile unsigned long lock;
         unsigned int writer_pc, writer_cpu;
         unsigned int reader_pc[NR_CPUS];
+#ifdef CONFIG_PREEMPT
+        unsigned int break_lock;
+#endif
 } rwlock_t;
 #define RW_LOCK_UNLOCKED        (rwlock_t) { 0, 0, 0xff, { } }
 #define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
@@ -304,6 +316,8 @@ do {	unsigned long flags; \
 #endif /* CONFIG_DEBUG_SPINLOCK */
 
 #define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
+#define read_can_lock(rw)       (!((rw)->lock & 0x80000000UL))
+#define write_can_lock(rw)      (!(rw)->lock)
 
 #endif /* !(__ASSEMBLY__) */