[S390] Inline assembly cleanup.

[pandora-kernel.git] / include / asm-s390 / spinlock.h

diff --git a/include/asm-s390/spinlock.h b/include/asm-s390/spinlock.h
index 321b23b..ce3edf6 100644 (file)
--- a/include/asm-s390/spinlock.h
+++ b/include/asm-s390/spinlock.h
@@ -11,41 +11,54 @@
 #ifndef __ASM_SPINLOCK_H
 #define __ASM_SPINLOCK_H
 
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+
+static inline int
+_raw_compare_and_swap(volatile unsigned int *lock,
+                     unsigned int old, unsigned int new)
+{
+       asm volatile(
+               "       cs      %0,%3,%1"
+               : "=d" (old), "=Q" (*lock)
+               : "0" (old), "d" (new), "Q" (*lock)
+               : "cc", "memory" );
+       return old;
+}
+
+#else /* __GNUC__ */
+
 static inline int
 _raw_compare_and_swap(volatile unsigned int *lock,
                      unsigned int old, unsigned int new)
 {
-       asm volatile ("cs %0,%3,0(%4)"
-                     : "=d" (old), "=m" (*lock)
-                     : "0" (old), "d" (new), "a" (lock), "m" (*lock)
-                     : "cc", "memory" );
+       asm volatile(
+               "       cs      %0,%3,0(%4)"
+               : "=d" (old), "=m" (*lock)
+               : "0" (old), "d" (new), "a" (lock), "m" (*lock)
+               : "cc", "memory" );
        return old;
 }
 
+#endif /* __GNUC__ */
+
 /*
  * Simple spin lock operations.  There are two variants, one clears IRQ's
  * on the local processor, one does not.
  *
  * We make no fairness assumptions. They have a cost.
+ *
+ * (the type definitions are in asm/spinlock_types.h)
  */
 
-typedef struct {
-       volatile unsigned int lock;
-#ifdef CONFIG_PREEMPT
-       unsigned int break_lock;
-#endif
-} __attribute__ ((aligned (4))) spinlock_t;
+#define __raw_spin_is_locked(x) ((x)->lock != 0)
+#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+#define __raw_spin_unlock_wait(lock) \
+       do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
 
-#define SPIN_LOCK_UNLOCKED     (spinlock_t) { 0 }
-#define spin_lock_init(lp)     do { (lp)->lock = 0; } while(0)
-#define spin_unlock_wait(lp)   do { barrier(); } while(((volatile spinlock_t *)(lp))->lock)
-#define spin_is_locked(x)      ((x)->lock != 0)
-#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
+extern void _raw_spin_lock_wait(raw_spinlock_t *lp, unsigned int pc);
+extern int _raw_spin_trylock_retry(raw_spinlock_t *lp, unsigned int pc);
 
-extern void _raw_spin_lock_wait(spinlock_t *lp, unsigned int pc);
-extern int _raw_spin_trylock_retry(spinlock_t *lp, unsigned int pc);
-
-static inline void _raw_spin_lock(spinlock_t *lp)
+static inline void __raw_spin_lock(raw_spinlock_t *lp)
 {
        unsigned long pc = 1 | (unsigned long) __builtin_return_address(0);
 
@@ -53,7 +66,7 @@ static inline void _raw_spin_lock(spinlock_t *lp)
                _raw_spin_lock_wait(lp, pc);
 }
 
-static inline int _raw_spin_trylock(spinlock_t *lp)
+static inline int __raw_spin_trylock(raw_spinlock_t *lp)
 {
        unsigned long pc = 1 | (unsigned long) __builtin_return_address(0);
 
@@ -62,7 +75,7 @@ static inline int _raw_spin_trylock(spinlock_t *lp)
        return _raw_spin_trylock_retry(lp, pc);
 }
 
-static inline void _raw_spin_unlock(spinlock_t *lp)
+static inline void __raw_spin_unlock(raw_spinlock_t *lp)
 {
        _raw_compare_and_swap(&lp->lock, lp->lock, 0);
 }
@@ -77,36 +90,25 @@ static inline void _raw_spin_unlock(spinlock_t *lp)
  * irq-safe write-lock, but readers can get non-irqsafe
  * read-locks.
  */
-typedef struct {
-       volatile unsigned int lock;
-       volatile unsigned long owner_pc;
-#ifdef CONFIG_PREEMPT
-       unsigned int break_lock;
-#endif
-} rwlock_t;
-
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
-
-#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0)
 
 /**
  * read_can_lock - would read_trylock() succeed?
  * @lock: the rwlock in question.
  */
-#define read_can_lock(x) ((int)(x)->lock >= 0)
+#define __raw_read_can_lock(x) ((int)(x)->lock >= 0)
 
 /**
  * write_can_lock - would write_trylock() succeed?
  * @lock: the rwlock in question.
  */
-#define write_can_lock(x) ((x)->lock == 0)
+#define __raw_write_can_lock(x) ((x)->lock == 0)
 
-extern void _raw_read_lock_wait(rwlock_t *lp);
-extern int _raw_read_trylock_retry(rwlock_t *lp);
-extern void _raw_write_lock_wait(rwlock_t *lp);
-extern int _raw_write_trylock_retry(rwlock_t *lp);
+extern void _raw_read_lock_wait(raw_rwlock_t *lp);
+extern int _raw_read_trylock_retry(raw_rwlock_t *lp);
+extern void _raw_write_lock_wait(raw_rwlock_t *lp);
+extern int _raw_write_trylock_retry(raw_rwlock_t *lp);
 
-static inline void _raw_read_lock(rwlock_t *rw)
+static inline void __raw_read_lock(raw_rwlock_t *rw)
 {
        unsigned int old;
        old = rw->lock & 0x7fffffffU;
@@ -114,7 +116,7 @@ static inline void _raw_read_lock(rwlock_t *rw)
                _raw_read_lock_wait(rw);
 }
 
-static inline void _raw_read_unlock(rwlock_t *rw)
+static inline void __raw_read_unlock(raw_rwlock_t *rw)
 {
        unsigned int old, cmp;
 
@@ -125,18 +127,18 @@ static inline void _raw_read_unlock(rwlock_t *rw)
        } while (cmp != old);
 }
 
-static inline void _raw_write_lock(rwlock_t *rw)
+static inline void __raw_write_lock(raw_rwlock_t *rw)
 {
        if (unlikely(_raw_compare_and_swap(&rw->lock, 0, 0x80000000) != 0))
                _raw_write_lock_wait(rw);
 }
 
-static inline void _raw_write_unlock(rwlock_t *rw)
+static inline void __raw_write_unlock(raw_rwlock_t *rw)
 {
        _raw_compare_and_swap(&rw->lock, 0x80000000, 0);
 }
 
-static inline int _raw_read_trylock(rwlock_t *rw)
+static inline int __raw_read_trylock(raw_rwlock_t *rw)
 {
        unsigned int old;
        old = rw->lock & 0x7fffffffU;
@@ -145,7 +147,7 @@ static inline int _raw_read_trylock(rwlock_t *rw)
        return _raw_read_trylock_retry(rw);
 }
 
-static inline int _raw_write_trylock(rwlock_t *rw)
+static inline int __raw_write_trylock(raw_rwlock_t *rw)
 {
        if (likely(_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0))
                return 1;