[PATCH] mutex: some cleanups

Turn some macros into inline functions and add proper type checking as
well as being more readable.  Also a minor comment adjustment.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 33 insertions, 30 deletions

diff --git a/include/asm-generic/mutex-dec.h b/include/asm-generic/mutex-dec.h
index 40c6d1f86598..29c6ac34e236 100644
--- a/include/asm-generic/mutex-dec.h
+++ b/include/asm-generic/mutex-dec.h
@@ -17,13 +17,14 @@
  * it wasn't 1 originally. This function MUST leave the value lower than
  * 1 even when the "1" assertion wasn't true.
  */
-#define __mutex_fastpath_lock(count, fail_fn)                           \
-do {                                                                    \
-        if (unlikely(atomic_dec_return(count) < 0))                     \
-                fail_fn(count);                                         \
-        else                                                            \
-                smp_mb();                                               \
-} while (0)
+static inline void
+__mutex_fastpath_lock(atomic_t *count, fastcall void (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_dec_return(count) < 0))
+                fail_fn(count);
+        else
+                smp_mb();
+}
 
 /**
  *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
@@ -36,7 +37,7 @@ do {									\
  * or anything the slow path function returns.
  */
 static inline int
-__mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
+__mutex_fastpath_lock_retval(atomic_t *count, fastcall int (*fail_fn)(atomic_t *))
 {
         if (unlikely(atomic_dec_return(count) < 0))
                 return fail_fn(count);
@@ -59,12 +60,13 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
  * __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
  * to return 0 otherwise.
  */
-#define __mutex_fastpath_unlock(count, fail_fn)                         \
-do {                                                                    \
-        smp_mb();                                                       \
-        if (unlikely(atomic_inc_return(count) <= 0))                    \
-                fail_fn(count);                                         \
-} while (0)
+static inline void
+__mutex_fastpath_unlock(atomic_t *count, fastcall void (*fail_fn)(atomic_t *))
+{
+        smp_mb();
+        if (unlikely(atomic_inc_return(count) <= 0))
+                fail_fn(count);
+}
 
 #define __mutex_slowpath_needs_to_unlock()              1
 
diff --git a/include/asm-generic/mutex-xchg.h b/include/asm-generic/mutex-xchg.h
index 1d24f47e6c48..32a2100c1aeb 100644
--- a/include/asm-generic/mutex-xchg.h
+++ b/include/asm-generic/mutex-xchg.h
@@ -3,7 +3,7 @@
  *
  * Generic implementation of the mutex fastpath, based on xchg().
  *
- * NOTE: An xchg based implementation is less optimal than an atomic
+ * NOTE: An xchg based implementation might be less optimal than an atomic
  *       decrement/increment based implementation. If your architecture
  *       has a reasonable atomic dec/inc then you should probably use
  *       asm-generic/mutex-dec.h instead, or you could open-code an
@@ -22,14 +22,14 @@
  * wasn't 1 originally. This function MUST leave the value lower than 1
  * even when the "1" assertion wasn't true.
  */
-#define __mutex_fastpath_lock(count, fail_fn)                           \
-do {                                                                    \
-        if (unlikely(atomic_xchg(count, 0) != 1))                       \
-                fail_fn(count);                                         \
-        else                                                            \
-                smp_mb();                                               \
-} while (0)
-
+static inline void
+__mutex_fastpath_lock(atomic_t *count, fastcall void (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_xchg(count, 0) != 1))
+                fail_fn(count);
+        else
+                smp_mb();
+}
 
 /**
  *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
@@ -42,7 +42,7 @@ do {									\
  * or anything the slow path function returns
  */
 static inline int
-__mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
+__mutex_fastpath_lock_retval(atomic_t *count, fastcall int (*fail_fn)(atomic_t *))
 {
         if (unlikely(atomic_xchg(count, 0) != 1))
                 return fail_fn(count);
@@ -64,12 +64,13 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
  * __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
  * to return 0 otherwise.
  */
-#define __mutex_fastpath_unlock(count, fail_fn)                         \
-do {                                                                    \
-        smp_mb();                                                       \
-        if (unlikely(atomic_xchg(count, 1) != 0))                       \
-                fail_fn(count);                                         \
-} while (0)
+static inline void
+__mutex_fastpath_unlock(atomic_t *count, fastcall void (*fail_fn)(atomic_t *))
+{
+        smp_mb();
+        if (unlikely(atomic_xchg(count, 1) != 0))
+                fail_fn(count);
+}
 
 #define __mutex_slowpath_needs_to_unlock()              0