The patch titled
fsaio: interfaces to initialize and to test a wait bit key
has been added to the -mm tree. Its filename is
fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fsaio: interfaces to initialize and to test a wait bit key
From: Suparna Bhattacharya <suparna@xxxxxxxxxx>
init_wait_bit_key() initializes the key field in an already allocated wait bit
structure, useful for async wait bit support. Also separate out the wait bit
test to a common routine which can be used by different kinds of wakeup
callbacks.
Signed-off-by: Suparna Bhattacharya <suparna@xxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/wait.h | 26 ++++++++++++++++++++++++++
kernel/wait.c | 11 ++---------
2 files changed, 28 insertions(+), 9 deletions(-)
diff -puN include/linux/wait.h~fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key include/linux/wait.h
--- a/include/linux/wait.h~fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key
+++ a/include/linux/wait.h
@@ -108,6 +108,17 @@ static inline int waitqueue_active(wait_
return !list_empty(&q->task_list);
}
+static inline int test_wait_bit_key(wait_queue_t *wait,
+ struct wait_bit_key *key)
+{
+ struct wait_bit_queue *wait_bit
+ = container_of(wait, struct wait_bit_queue, wait);
+
+ return (wait_bit->key.flags == key->flags &&
+ wait_bit->key.bit_nr == key->bit_nr &&
+ !test_bit(key->bit_nr, key->flags));
+}
+
/*
* Used to distinguish between sync and async io wait context:
* sync i/o typically specifies a NULL wait queue entry or a wait
@@ -416,6 +427,21 @@ int wake_bit_function(wait_queue_t *wait
INIT_LIST_HEAD(&(wait)->task_list); \
} while (0)
+static inline void init_wait_bit_key(struct wait_bit_queue *waitbit,
+ void *word, int bit)
+{
+ waitbit->key.flags = word;
+ waitbit->key.bit_nr = bit;
+}
+
+static inline void init_wait_bit_task(struct wait_bit_queue *waitbit,
+ struct task_struct *tsk)
+{
+ waitbit->wait.private = tsk;
+ waitbit->wait.func = wake_bit_function;
+ INIT_LIST_HEAD(&waitbit->wait.task_list);
+}
+
/**
* wait_on_bit - wait for a bit to be cleared
* @word: the word being waited on, a kernel virtual address
diff -puN kernel/wait.c~fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key kernel/wait.c
--- a/kernel/wait.c~fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key
+++ a/kernel/wait.c
@@ -139,16 +139,9 @@ EXPORT_SYMBOL(autoremove_wake_function);
int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *arg)
{
- struct wait_bit_key *key = arg;
- struct wait_bit_queue *wait_bit
- = container_of(wait, struct wait_bit_queue, wait);
-
- if (wait_bit->key.flags != key->flags ||
- wait_bit->key.bit_nr != key->bit_nr ||
- test_bit(key->bit_nr, key->flags))
+ if (!test_wait_bit_key(wait, arg))
return 0;
- else
- return autoremove_wake_function(wait, mode, sync, key);
+ return autoremove_wake_function(wait, mode, sync, arg);
}
EXPORT_SYMBOL(wake_bit_function);
_
Patches currently in -mm which might be from suparna@xxxxxxxxxx are
aio-fix-buggy-put_ioctx-call-in-aio_complete-v2.patch
fsaio-add-a-wait-queue-arg-to-the-wait_bit-action-routine.patch
fsaio-rename-__lock_page-to-lock_page_blocking.patch
fsaio-interfaces-to-initialize-and-to-test-a-wait-bit-key.patch
fsaio-add-a-default-io-wait-bit-field-in-task-struct.patch
fsaio-enable-wait-bit-based-filtered-wakeups-to-work-for-aio.patch
fsaio-enable-asynchronous-wait-page-and-lock-page.patch
fsaio-filesystem-aio-read.patch
fsaio-aio-o_sync-filesystem-write.patch
aio-is-unlikely.patch
-
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