[PATCH] aio: make wait_queue ->task ->private

In the upcoming aio_down patch, it is useful to store a private data
pointer in the kiocb's wait_queue.  Since we provide our own wake up
function and do not require the task_struct pointer, it makes sense to
convert the task pointer into a generic private pointer.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/wait.h b/include/linux/wait.h
index c9486c3..d38c9fe 100644 (file)
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -33,7 +33,7 @@ int default_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key
 struct __wait_queue {
        unsigned int flags;
 #define WQ_FLAG_EXCLUSIVE      0x01
-       struct task_struct * task;
+       void *private;
        wait_queue_func_t func;
        struct list_head task_list;
 };
@@ -60,7 +60,7 @@ typedef struct __wait_queue_head wait_queue_head_t;
  */
 
 #define __WAITQUEUE_INITIALIZER(name, tsk) {                           \
-       .task           = tsk,                                          \
+       .private        = tsk,                                          \
        .func           = default_wake_function,                        \
        .task_list      = { NULL, NULL } }
 
@@ -86,7 +86,7 @@ static inline void init_waitqueue_head(wait_queue_head_t *q)
 static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
 {
        q->flags = 0;
-       q->task = p;
+       q->private = p;
        q->func = default_wake_function;
 }
 
@@ -94,7 +94,7 @@ static inline void init_waitqueue_func_entry(wait_queue_t *q,
                                        wait_queue_func_t func)
 {
        q->flags = 0;
-       q->task = NULL;
+       q->private = NULL;
        q->func = func;
 }
 
@@ -110,7 +110,7 @@ static inline int waitqueue_active(wait_queue_head_t *q)
  * aio specifies a wait queue entry with an async notification
  * callback routine, not associated with any task.
  */
-#define is_sync_wait(wait)     (!(wait) || ((wait)->task))
+#define is_sync_wait(wait)     (!(wait) || ((wait)->private))
 
 extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
@@ -384,7 +384,7 @@ int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
 
 #define DEFINE_WAIT(name)                                              \
        wait_queue_t name = {                                           \
-               .task           = current,                              \
+               .private        = current,                              \
                .func           = autoremove_wake_function,             \
                .task_list      = LIST_HEAD_INIT((name).task_list),     \
        }
@@ -393,7 +393,7 @@ int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
        struct wait_bit_queue name = {                                  \
                .key = __WAIT_BIT_KEY_INITIALIZER(word, bit),           \
                .wait   = {                                             \
-                       .task           = current,                      \
+                       .private        = current,                      \
                        .func           = wake_bit_function,            \
                        .task_list      =                               \
                                LIST_HEAD_INIT((name).wait.task_list),  \
@@ -402,7 +402,7 @@ int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
 
 #define init_wait(wait)                                                        \
        do {                                                            \
-               (wait)->task = current;                                 \
+               (wait)->private = current;                              \
                (wait)->func = autoremove_wake_function;                \
                INIT_LIST_HEAD(&(wait)->task_list);                     \
        } while (0)

diff --git a/kernel/sched.c b/kernel/sched.c
index 6ee4515..76080d1 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2869,7 +2869,7 @@ need_resched:
 
 int default_wake_function(wait_queue_t *curr, unsigned mode, int sync, void *key)
 {
-       task_t *p = curr->task;
+       task_t *p = curr->private;
        return try_to_wake_up(p, mode, sync);
 }