[PATCH] i386: Remove lock section support in semaphore.h

Lock sections don't work the new dwarf2 unwinder
This generates slightly smaller code. It adds one more taken
jump to the fast path.

Cc: jbeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/include/asm-i386/semaphore.h b/include/asm-i386/semaphore.h
index d51e800..e63b6a6 100644 (file)
--- a/include/asm-i386/semaphore.h
+++ b/include/asm-i386/semaphore.h
@@ -100,13 +100,10 @@ static inline void down(struct semaphore * sem)
        __asm__ __volatile__(
                "# atomic down operation\n\t"
                LOCK_PREFIX "decl %0\n\t"     /* --sem->count */
-               "js 2f\n"
-               "1:\n"
-               LOCK_SECTION_START("")
-               "2:\tlea %0,%%eax\n\t"
-               "call __down_failed\n\t"
-               "jmp 1b\n"
-               LOCK_SECTION_END
+               "jns 2f\n"
+               "\tlea %0,%%eax\n\t"
+               "call __down_failed\n"
+               "2:"
                :"+m" (sem->count)
                :
                :"memory","ax");
@@ -123,15 +120,12 @@ static inline int down_interruptible(struct semaphore * sem)
        might_sleep();
        __asm__ __volatile__(
                "# atomic interruptible down operation\n\t"
+               "xorl %0,%0\n\t"
                LOCK_PREFIX "decl %1\n\t"     /* --sem->count */
-               "js 2f\n\t"
-               "xorl %0,%0\n"
-               "1:\n"
-               LOCK_SECTION_START("")
-               "2:\tlea %1,%%eax\n\t"
-               "call __down_failed_interruptible\n\t"
-               "jmp 1b\n"
-               LOCK_SECTION_END
+               "jns 2f\n\t"
+               "lea %1,%%eax\n\t"
+               "call __down_failed_interruptible\n"
+               "2:"
                :"=a" (result), "+m" (sem->count)
                :
                :"memory");
@@ -148,15 +142,12 @@ static inline int down_trylock(struct semaphore * sem)
 
        __asm__ __volatile__(
                "# atomic interruptible down operation\n\t"
+               "xorl %0,%0\n\t"
                LOCK_PREFIX "decl %1\n\t"     /* --sem->count */
-               "js 2f\n\t"
-               "xorl %0,%0\n"
-               "1:\n"
-               LOCK_SECTION_START("")
-               "2:\tlea %1,%%eax\n\t"
+               "jns 2f\n\t"
+               "lea %1,%%eax\n\t"
                "call __down_failed_trylock\n\t"
-               "jmp 1b\n"
-               LOCK_SECTION_END
+               "2:\n"
                :"=a" (result), "+m" (sem->count)
                :
                :"memory");
@@ -166,22 +157,16 @@ static inline int down_trylock(struct semaphore * sem)
 /*
  * Note! This is subtle. We jump to wake people up only if
  * the semaphore was negative (== somebody was waiting on it).
- * The default case (no contention) will result in NO
- * jumps for both down() and up().
  */
 static inline void up(struct semaphore * sem)
 {
        __asm__ __volatile__(
                "# atomic up operation\n\t"
                LOCK_PREFIX "incl %0\n\t"     /* ++sem->count */
-               "jle 2f\n"
-               "1:\n"
-               LOCK_SECTION_START("")
-               "2:\tlea %0,%%eax\n\t"
-               "call __up_wakeup\n\t"
-               "jmp 1b\n"
-               LOCK_SECTION_END
-               ".subsection 0\n"
+               "jg 1f\n\t"
+               "lea %0,%%eax\n\t"
+               "call __up_wakeup\n"
+               "1:"
                :"+m" (sem->count)
                :
                :"memory","ax");