Generic semaphore implementation

Semaphores are no longer performance-critical, so a generic C
implementation is better for maintainability, debuggability and
extensibility.  Thanks to Peter Zijlstra for fixing the lockdep
warning.  Thanks to Harvey Harrison for pointing out that the
unlikely() was unnecessary.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 85 deletions

diff --git a/include/asm-h8300/semaphore-helper.h b/include/asm-h8300/semaphore-helper.h
deleted file mode 100644
index 4fea36be5fd8..000000000000
--- a/include/asm-h8300/semaphore-helper.h
+++ /dev/null
@@ -1,85 +0,0 @@
-#ifndef _H8300_SEMAPHORE_HELPER_H
-#define _H8300_SEMAPHORE_HELPER_H
-
-/*
- * SMP- and interrupt-safe semaphores helper functions.
- *
- * (C) Copyright 1996 Linus Torvalds
- *
- * based on
- * m68k version by Andreas Schwab
- */
-
-#include <linux/errno.h>
-
-/*
- * These two _must_ execute atomically wrt each other.
- */
-static inline void wake_one_more(struct semaphore * sem)
-{
-        atomic_inc((atomic_t *)&sem->sleepers);
-}
-
-static inline int waking_non_zero(struct semaphore *sem)
-{
-        int ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&semaphore_wake_lock, flags);
-        ret = 0;
-        if (sem->sleepers > 0) {
-                sem->sleepers--;
-                ret = 1;
-        }
-        spin_unlock_irqrestore(&semaphore_wake_lock, flags);
-        return ret;
-}
-
-/*
- * waking_non_zero_interruptible:
- *      1       got the lock
- *      0       go to sleep
- *      -EINTR  interrupted
- */
-static inline int waking_non_zero_interruptible(struct semaphore *sem,
-                                                struct task_struct *tsk)
-{
-        int ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&semaphore_wake_lock, flags);
-        ret = 0;
-        if (sem->sleepers > 0) {
-                sem->sleepers--;
-                ret = 1;
-        } else if (signal_pending(tsk)) {
-                atomic_inc(&sem->count);
-                ret = -EINTR;
-        }
-        spin_unlock_irqrestore(&semaphore_wake_lock, flags);
-        return ret;
-}
-
-/*
- * waking_non_zero_trylock:
- *      1       failed to lock
- *      0       got the lock
- */
-static inline int waking_non_zero_trylock(struct semaphore *sem)
-{
-        int ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&semaphore_wake_lock, flags);
-        ret = 1;
-        if (sem->sleepers <= 0)
-                atomic_inc(&sem->count);
-        else {
-                sem->sleepers--;
-                ret = 0;
-        }
-        spin_unlock_irqrestore(&semaphore_wake_lock, flags);
-        return ret;
-}
-
-#endif