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    Subject[PATCH 03/14] FS-Cache: Provide an add_wait_queue_tail() function [try #2]
    Date
    Provide an add_wait_queue_tail() function to add a waiter to the back of a
    wait queue instead of the front.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    include/linux/wait.h | 1 +
    kernel/wait.c | 18 ++++++++++++++++++
    2 files changed, 19 insertions(+), 0 deletions(-)

    diff --git a/include/linux/wait.h b/include/linux/wait.h
    index 0e68628..4cae7db 100644
    --- a/include/linux/wait.h
    +++ b/include/linux/wait.h
    @@ -118,6 +118,7 @@ static inline int waitqueue_active(wait_queue_head_t *q)
    #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_tail(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));
    extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));

    diff --git a/kernel/wait.c b/kernel/wait.c
    index 444ddbf..7acc9cc 100644
    --- a/kernel/wait.c
    +++ b/kernel/wait.c
    @@ -29,6 +29,24 @@ void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait)
    }
    EXPORT_SYMBOL(add_wait_queue);

    +/**
    + * add_wait_queue_tail - Add a waiter to the back of a waitqueue
    + * @q: the wait queue to append the waiter to
    + * @wait: the waiter to be queued
    + *
    + * Add a waiter to the back of a waitqueue so that it gets woken up last.
    + */
    +void fastcall add_wait_queue_tail(wait_queue_head_t *q, wait_queue_t *wait)
    +{
    + unsigned long flags;
    +
    + wait->flags &= ~WQ_FLAG_EXCLUSIVE;
    + spin_lock_irqsave(&q->lock, flags);
    + __add_wait_queue_tail(q, wait);
    + spin_unlock_irqrestore(&q->lock, flags);
    +}
    +EXPORT_SYMBOL(add_wait_queue_tail);
    +
    void fastcall add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
    {
    unsigned long flags;
    -
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