-#ifndef CONFIG_DEBUG_SPINLOCK
-
-typedef unsigned int rwlock_t;
-#define RW_LOCK_UNLOCKED 0
-#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
-#define rwlock_is_locked(x) (*(x) != RW_LOCK_UNLOCKED)
-
-extern void __read_lock(rwlock_t *);
-extern void __read_unlock(rwlock_t *);
-extern void __write_lock(rwlock_t *);
-extern void __write_unlock(rwlock_t *);
-extern int __write_trylock(rwlock_t *);
-
-#define _raw_read_lock(p) __read_lock(p)
-#define _raw_read_unlock(p) __read_unlock(p)
-#define _raw_write_lock(p) __write_lock(p)
-#define _raw_write_unlock(p) __write_unlock(p)
-#define _raw_write_trylock(p) __write_trylock(p)
-
-#else /* !(CONFIG_DEBUG_SPINLOCK) */
-
-typedef struct {
- unsigned long lock;
- unsigned int writer_pc, writer_cpu;
- unsigned int reader_pc[NR_CPUS];
-} rwlock_t;
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0, 0xff, { } }
-#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
-#define rwlock_is_locked(x) ((x)->lock != 0)
-
-extern void _do_read_lock(rwlock_t *rw, char *str);
-extern void _do_read_unlock(rwlock_t *rw, char *str);
-extern void _do_write_lock(rwlock_t *rw, char *str);
-extern void _do_write_unlock(rwlock_t *rw);
-extern int _do_write_trylock(rwlock_t *rw, char *str);
-
-#define _raw_read_lock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_read_lock(lock, "read_lock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_read_unlock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_read_unlock(lock, "read_unlock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_write_lock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_write_lock(lock, "write_lock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_write_unlock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_write_unlock(lock); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_write_trylock(lock) \
-({ unsigned long flags; \
- int val; \
- local_irq_save(flags); \
- val = _do_write_trylock(lock, "write_trylock"); \
- local_irq_restore(flags); \
- val; \
-})
-
-#endif /* CONFIG_DEBUG_SPINLOCK */
+static void inline __read_lock(raw_rwlock_t *lock)
+{
+ unsigned long tmp1, tmp2;
+
+ __asm__ __volatile__ (
+"1: ldsw [%2], %0\n"
+" brlz,pn %0, 2f\n"
+"4: add %0, 1, %1\n"
+" cas [%2], %0, %1\n"
+" cmp %0, %1\n"
+" membar #StoreLoad | #StoreStore\n"
+" bne,pn %%icc, 1b\n"
+" nop\n"
+" .subsection 2\n"
+"2: ldsw [%2], %0\n"
+" membar #LoadLoad\n"
+" brlz,pt %0, 2b\n"
+" nop\n"
+" ba,a,pt %%xcc, 4b\n"
+" .previous"
+ : "=&r" (tmp1), "=&r" (tmp2)
+ : "r" (lock)
+ : "memory");
+}
+
+static int inline __read_trylock(raw_rwlock_t *lock)
+{
+ int tmp1, tmp2;
+
+ __asm__ __volatile__ (
+"1: ldsw [%2], %0\n"
+" brlz,a,pn %0, 2f\n"
+" mov 0, %0\n"
+" add %0, 1, %1\n"
+" cas [%2], %0, %1\n"
+" cmp %0, %1\n"
+" membar #StoreLoad | #StoreStore\n"
+" bne,pn %%icc, 1b\n"
+" mov 1, %0\n"
+"2:"
+ : "=&r" (tmp1), "=&r" (tmp2)
+ : "r" (lock)
+ : "memory");
+
+ return tmp1;
+}
+
+static void inline __read_unlock(raw_rwlock_t *lock)
+{
+ unsigned long tmp1, tmp2;
+
+ __asm__ __volatile__(
+" membar #StoreLoad | #LoadLoad\n"
+"1: lduw [%2], %0\n"
+" sub %0, 1, %1\n"
+" cas [%2], %0, %1\n"
+" cmp %0, %1\n"
+" bne,pn %%xcc, 1b\n"
+" nop"
+ : "=&r" (tmp1), "=&r" (tmp2)
+ : "r" (lock)
+ : "memory");
+}
+
+static void inline __write_lock(raw_rwlock_t *lock)
+{
+ unsigned long mask, tmp1, tmp2;
+
+ mask = 0x80000000UL;
+
+ __asm__ __volatile__(
+"1: lduw [%2], %0\n"
+" brnz,pn %0, 2f\n"
+"4: or %0, %3, %1\n"
+" cas [%2], %0, %1\n"
+" cmp %0, %1\n"
+" membar #StoreLoad | #StoreStore\n"
+" bne,pn %%icc, 1b\n"
+" nop\n"
+" .subsection 2\n"
+"2: lduw [%2], %0\n"
+" membar #LoadLoad\n"
+" brnz,pt %0, 2b\n"
+" nop\n"
+" ba,a,pt %%xcc, 4b\n"
+" .previous"
+ : "=&r" (tmp1), "=&r" (tmp2)
+ : "r" (lock), "r" (mask)
+ : "memory");
+}
+
+static void inline __write_unlock(raw_rwlock_t *lock)
+{
+ __asm__ __volatile__(
+" membar #LoadStore | #StoreStore\n"
+" stw %%g0, [%0]"
+ : /* no outputs */
+ : "r" (lock)
+ : "memory");
+}
+
+static int inline __write_trylock(raw_rwlock_t *lock)
+{
+ unsigned long mask, tmp1, tmp2, result;
+
+ mask = 0x80000000UL;
+
+ __asm__ __volatile__(
+" mov 0, %2\n"
+"1: lduw [%3], %0\n"
+" brnz,pn %0, 2f\n"
+" or %0, %4, %1\n"
+" cas [%3], %0, %1\n"
+" cmp %0, %1\n"
+" membar #StoreLoad | #StoreStore\n"
+" bne,pn %%icc, 1b\n"
+" nop\n"
+" mov 1, %2\n"
+"2:"
+ : "=&r" (tmp1), "=&r" (tmp2), "=&r" (result)
+ : "r" (lock), "r" (mask)
+ : "memory");
+
+ return result;
+}
+
+#define __raw_read_lock(p) __read_lock(p)
+#define __raw_read_trylock(p) __read_trylock(p)
+#define __raw_read_unlock(p) __read_unlock(p)
+#define __raw_write_lock(p) __write_lock(p)
+#define __raw_write_unlock(p) __write_unlock(p)
+#define __raw_write_trylock(p) __write_trylock(p)
+
+#define __raw_read_can_lock(rw) (!((rw)->lock & 0x80000000UL))
+#define __raw_write_can_lock(rw) (!(rw)->lock)