[PATCH] remove wq_lock_t cruft

This patch removes the whole wq_lock_t abstraction, forcing the behavior
to be that of a standard spinlock and changes all the wq_lock code in
the tree appropriately.

Removes lots of code - always a Good Thing to me.  New behavior is same
as previous behavior (USE_RW_WAIT_QUEUE_SPINLOCK unset).

1 files changed, 3 insertions, 37 deletions

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 186f03f015f7..cc32e6b1c4f7 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -27,42 +27,8 @@ struct __wait_queue {
 };
 typedef struct __wait_queue wait_queue_t;
 
-/*
- * 'dual' spinlock architecture. Can be switched between spinlock_t and
- * rwlock_t locks via changing this define. Since waitqueues are quite
- * decoupled in the new architecture, lightweight 'simple' spinlocks give
- * us slightly better latencies and smaller waitqueue structure size.
- */
-#define USE_RW_WAIT_QUEUE_SPINLOCK 0
-
-#if USE_RW_WAIT_QUEUE_SPINLOCK
-# define wq_lock_t rwlock_t
-# define WAITQUEUE_RW_LOCK_UNLOCKED RW_LOCK_UNLOCKED
-
-# define wq_read_lock read_lock
-# define wq_read_lock_irqsave read_lock_irqsave
-# define wq_read_unlock_irqrestore read_unlock_irqrestore
-# define wq_read_unlock read_unlock
-# define wq_write_lock_irq write_lock_irq
-# define wq_write_lock_irqsave write_lock_irqsave
-# define wq_write_unlock_irqrestore write_unlock_irqrestore
-# define wq_write_unlock write_unlock
-#else
-# define wq_lock_t spinlock_t
-# define WAITQUEUE_RW_LOCK_UNLOCKED SPIN_LOCK_UNLOCKED
-
-# define wq_read_lock spin_lock
-# define wq_read_lock_irqsave spin_lock_irqsave
-# define wq_read_unlock spin_unlock
-# define wq_read_unlock_irqrestore spin_unlock_irqrestore
-# define wq_write_lock_irq spin_lock_irq
-# define wq_write_lock_irqsave spin_lock_irqsave
-# define wq_write_unlock_irqrestore spin_unlock_irqrestore
-# define wq_write_unlock spin_unlock
-#endif
-
 struct __wait_queue_head {
-	wq_lock_t lock;
+	spinlock_t lock;
 	struct list_head task_list;
 };
 typedef struct __wait_queue_head wait_queue_head_t;
@@ -80,7 +46,7 @@ typedef struct __wait_queue_head wait_queue_head_t;
 	wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)
 
 #define __WAIT_QUEUE_HEAD_INITIALIZER(name) {				\
-	lock:		WAITQUEUE_RW_LOCK_UNLOCKED,			\
+	lock:		SPIN_LOCK_UNLOCKED,			\
 	task_list:	{ &(name).task_list, &(name).task_list } }
 
 #define DECLARE_WAIT_QUEUE_HEAD(name) \
@@ -88,7 +54,7 @@ typedef struct __wait_queue_head wait_queue_head_t;
 
 static inline void init_waitqueue_head(wait_queue_head_t *q)
 {
-	q->lock = WAITQUEUE_RW_LOCK_UNLOCKED;
+	q->lock = SPIN_LOCK_UNLOCKED;
 	INIT_LIST_HEAD(&q->task_list);
 }