[PATCH] Clean up spin/rwlocks

- Inline spinlock strings into their inline functions
- Convert macros to typesafe inlines
- Replace some leftover __asm__ __volatile__s with asm volatile

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 40 insertions, 31 deletions

diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h
index 1d0733b38a4b..be7a9e629fb2 100644
--- a/include/asm-x86_64/spinlock.h
+++ b/include/asm-x86_64/spinlock.h
@@ -16,30 +16,23 @@
  * (the type definitions are in asm/spinlock_types.h)
  */
 
-#define __raw_spin_is_locked(x) \
-                (*(volatile signed int *)(&(x)->slock) <= 0)
-
-#define __raw_spin_lock_string \
-        "\n1:\t" \
-        LOCK_PREFIX " ; decl %0\n\t" \
-        "jns 2f\n" \
-        "3:\n" \
-        "rep;nop\n\t" \
-        "cmpl $0,%0\n\t" \
-        "jle 3b\n\t" \
-        "jmp 1b\n" \
-        "2:\t" \
-
-#define __raw_spin_lock_string_up \
-        "\n\tdecl %0"
-
-#define __raw_spin_unlock_string \
-        "movl $1,%0" \
-                :"=m" (lock->slock) : : "memory"
+static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
+{
+        return *(volatile signed int *)(&(lock)->slock) <= 0;
+}
 
 static inline void __raw_spin_lock(raw_spinlock_t *lock)
 {
-        asm volatile(__raw_spin_lock_string : "=m" (lock->slock) : : "memory");
+        asm volatile(
+                "\n1:\t"
+                LOCK_PREFIX " ; decl %0\n\t"
+                "jns 2f\n"
+                "3:\n"
+                "rep;nop\n\t"
+                "cmpl $0,%0\n\t"
+                "jle 3b\n\t"
+                "jmp 1b\n"
+                "2:\t" : "=m" (lock->slock) : : "memory");
 }
 
 #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
@@ -48,7 +41,7 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 {
         int oldval;
 
-        __asm__ __volatile__(
+        asm volatile(
                 "xchgl %0,%1"
                 :"=q" (oldval), "=m" (lock->slock)
                 :"0" (0) : "memory");
@@ -58,13 +51,14 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 
 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 {
-        __asm__ __volatile__(
-                __raw_spin_unlock_string
-        );
+        asm volatile("movl $1,%0" :"=m" (lock->slock) :: "memory");
 }
 
-#define __raw_spin_unlock_wait(lock) \
-        do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
+static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
+{
+        while (__raw_spin_is_locked(lock))
+                cpu_relax();
+}
 
 /*
  * Read-write spinlocks, allowing multiple readers
@@ -80,17 +74,32 @@ static inline void __raw_spin_unlock(raw_spinlock_t *lock)
  * with the high bit (sign) being the "contended" bit.
  */
 
-#define __raw_read_can_lock(x)          ((int)(x)->lock > 0)
-#define __raw_write_can_lock(x)         ((x)->lock == RW_LOCK_BIAS)
+static inline int __raw_read_can_lock(raw_rwlock_t *lock)
+{
+        return (int)(lock)->lock > 0;
+}
+
+static inline int __raw_write_can_lock(raw_rwlock_t *lock)
+{
+        return (lock)->lock == RW_LOCK_BIAS;
+}
 
 static inline void __raw_read_lock(raw_rwlock_t *rw)
 {
-        __build_read_lock(rw);
+        asm volatile(LOCK_PREFIX "subl $1,(%0)\n\t"
+                     "jns 1f\n"
+                     "call __read_lock_failed\n"
+                     "1:\n"
+                     ::"D" (rw), "i" (RW_LOCK_BIAS) : "memory");
 }
 
 static inline void __raw_write_lock(raw_rwlock_t *rw)
 {
-        __build_write_lock(rw);
+        asm volatile(LOCK_PREFIX "subl %1,(%0)\n\t"
+                     "jz 1f\n"
+                     "\tcall __write_lock_failed\n\t"
+                     "1:\n"
+                     ::"D" (rw), "i" (RW_LOCK_BIAS) : "memory");
 }
 
 static inline int __raw_read_trylock(raw_rwlock_t *lock)