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authorMatthew Wilcox <matthew@wil.cx>2008-03-07 21:55:58 -0500
committerMatthew Wilcox <willy@linux.intel.com>2008-04-17 10:42:34 -0400
commit64ac24e738823161693bf791f87adc802cf529ff (patch)
tree19c0b0cf314d4394ca580c05b86cdf874ce0a167 /include/asm-cris
parente48b3deee475134585eed03e7afebe4bf9e0dba9 (diff)
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>
Diffstat (limited to 'include/asm-cris')
-rw-r--r--include/asm-cris/semaphore-helper.h78
-rw-r--r--include/asm-cris/semaphore.h134
2 files changed, 1 insertions, 211 deletions
diff --git a/include/asm-cris/semaphore-helper.h b/include/asm-cris/semaphore-helper.h
deleted file mode 100644
index 27bfeca1b981..000000000000
--- a/include/asm-cris/semaphore-helper.h
+++ /dev/null
@@ -1,78 +0,0 @@
-/* $Id: semaphore-helper.h,v 1.3 2001/03/26 15:00:33 orjanf Exp $
- *
- * SMP- and interrupt-safe semaphores helper functions. Generic versions, no
- * optimizations whatsoever...
- *
- */
-
-#ifndef _ASM_SEMAPHORE_HELPER_H
-#define _ASM_SEMAPHORE_HELPER_H
-
-#include <asm/atomic.h>
-#include <linux/errno.h>
-
-#define read(a) ((a)->counter)
-#define inc(a) (((a)->counter)++)
-#define dec(a) (((a)->counter)--)
-
-#define count_inc(a) ((*(a))++)
-
-/*
- * These two _must_ execute atomically wrt each other.
- */
-static inline void wake_one_more(struct semaphore * sem)
-{
- atomic_inc(&sem->waking);
-}
-
-static inline int waking_non_zero(struct semaphore *sem)
-{
- unsigned long flags;
- int ret = 0;
-
- local_irq_save(flags);
- if (read(&sem->waking) > 0) {
- dec(&sem->waking);
- ret = 1;
- }
- local_irq_restore(flags);
- return ret;
-}
-
-static inline int waking_non_zero_interruptible(struct semaphore *sem,
- struct task_struct *tsk)
-{
- int ret = 0;
- unsigned long flags;
-
- local_irq_save(flags);
- if (read(&sem->waking) > 0) {
- dec(&sem->waking);
- ret = 1;
- } else if (signal_pending(tsk)) {
- inc(&sem->count);
- ret = -EINTR;
- }
- local_irq_restore(flags);
- return ret;
-}
-
-static inline int waking_non_zero_trylock(struct semaphore *sem)
-{
- int ret = 1;
- unsigned long flags;
-
- local_irq_save(flags);
- if (read(&sem->waking) <= 0)
- inc(&sem->count);
- else {
- dec(&sem->waking);
- ret = 0;
- }
- local_irq_restore(flags);
- return ret;
-}
-
-#endif /* _ASM_SEMAPHORE_HELPER_H */
-
-
diff --git a/include/asm-cris/semaphore.h b/include/asm-cris/semaphore.h
index 31a4ac448195..d9b2034ed1d2 100644
--- a/include/asm-cris/semaphore.h
+++ b/include/asm-cris/semaphore.h
@@ -1,133 +1 @@
-/* $Id: semaphore.h,v 1.3 2001/05/08 13:54:09 bjornw Exp $ */
-
-/* On the i386 these are coded in asm, perhaps we should as well. Later.. */
-
-#ifndef _CRIS_SEMAPHORE_H
-#define _CRIS_SEMAPHORE_H
-
-#define RW_LOCK_BIAS 0x01000000
-
-#include <linux/wait.h>
-#include <linux/spinlock.h>
-#include <linux/rwsem.h>
-
-#include <asm/system.h>
-#include <asm/atomic.h>
-
-/*
- * CRIS semaphores, implemented in C-only so far.
- */
-
-struct semaphore {
- atomic_t count;
- atomic_t waking;
- wait_queue_head_t wait;
-};
-
-#define __SEMAPHORE_INITIALIZER(name, n) \
-{ \
- .count = ATOMIC_INIT(n), \
- .waking = ATOMIC_INIT(0), \
- .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
-}
-
-#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
- struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
-
-#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
-
-static inline void sema_init(struct semaphore *sem, int val)
-{
- *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
-}
-
-static inline void init_MUTEX (struct semaphore *sem)
-{
- sema_init(sem, 1);
-}
-
-static inline void init_MUTEX_LOCKED (struct semaphore *sem)
-{
- sema_init(sem, 0);
-}
-
-extern void __down(struct semaphore * sem);
-extern int __down_interruptible(struct semaphore * sem);
-extern int __down_trylock(struct semaphore * sem);
-extern void __up(struct semaphore * sem);
-
-/* notice - we probably can do cli/sti here instead of saving */
-
-static inline void down(struct semaphore * sem)
-{
- unsigned long flags;
- int failed;
-
- might_sleep();
-
- /* atomically decrement the semaphores count, and if its negative, we wait */
- cris_atomic_save(sem, flags);
- failed = --(sem->count.counter) < 0;
- cris_atomic_restore(sem, flags);
- if(failed) {
- __down(sem);
- }
-}
-
-/*
- * This version waits in interruptible state so that the waiting
- * process can be killed. The down_interruptible routine
- * returns negative for signalled and zero for semaphore acquired.
- */
-
-static inline int down_interruptible(struct semaphore * sem)
-{
- unsigned long flags;
- int failed;
-
- might_sleep();
-
- /* atomically decrement the semaphores count, and if its negative, we wait */
- cris_atomic_save(sem, flags);
- failed = --(sem->count.counter) < 0;
- cris_atomic_restore(sem, flags);
- if(failed)
- failed = __down_interruptible(sem);
- return(failed);
-}
-
-static inline int down_trylock(struct semaphore * sem)
-{
- unsigned long flags;
- int failed;
-
- cris_atomic_save(sem, flags);
- failed = --(sem->count.counter) < 0;
- cris_atomic_restore(sem, flags);
- if(failed)
- failed = __down_trylock(sem);
- return(failed);
-
-}
-
-/*
- * 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)
-{
- unsigned long flags;
- int wakeup;
-
- /* atomically increment the semaphores count, and if it was negative, we wake people */
- cris_atomic_save(sem, flags);
- wakeup = ++(sem->count.counter) <= 0;
- cris_atomic_restore(sem, flags);
- if(wakeup) {
- __up(sem);
- }
-}
-
-#endif
+#include <linux/semaphore.h>