Messages in this thread Patch in this message | | | Date | Wed, 3 Nov 2004 14:45:49 +0530 | From | Suparna Bhattacharya <> | Subject | Re: [PATCH 3/6] Interfaces to init and to test wait bit key |
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On Wed, Nov 03, 2004 at 02:40:36PM +0530, Suparna Bhattacharya wrote: > > The series of patches that follow integrate AIO with > William Lee Irwin's wait bit changes, to support asynchronous > page waits. > > [1] modify-wait-bit-action-args.patch > Add a wait queue arg to the wait_bit action() routine > > [2] lock_page_slow.patch > Rename __lock_page to lock_page_slow > > [3] init-wait-bit-key.patch > Interfaces to init and to test wait bit key >
-- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Lab, India
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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@in.ibm.com>
diff -puN include/linux/wait.h~init-wait-bit-key include/linux/wait.h
linux-2.6.10-rc1-suparna/include/linux/wait.h | 30 +++++++++++++++++++++++--- linux-2.6.10-rc1-suparna/kernel/wait.c | 11 +-------- 2 files changed, 29 insertions(+), 12 deletions(-)
diff -puN include/linux/wait.h~init-wait-bit-key include/linux/wait.h --- linux-2.6.10-rc1/include/linux/wait.h~init-wait-bit-key 2004-11-03 14:35:07.000000000 +0530 +++ linux-2.6.10-rc1-suparna/include/linux/wait.h 2004-11-03 14:35:07.000000000 +0530 @@ -103,6 +103,17 @@ 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 @@ -348,9 +359,22 @@ int wake_bit_function(wait_queue_t *wait #define init_wait(wait) \ do { \ - wait->task = current; \ - wait->func = autoremove_wake_function; \ - INIT_LIST_HEAD(&wait->task_list); \ + (wait)->task = current; \ + (wait)->func = autoremove_wake_function; \ + INIT_LIST_HEAD(&(wait)->task_list); \ + } while (0) + +#define init_wait_bit_key(waitbit, word, bit) \ + do { \ + (waitbit)->key.flags = word; \ + (waitbit)->key.bit_nr = bit; \ + } while (0) + +#define init_wait_bit_task(waitbit, tsk) \ + do { \ + (waitbit)->wait.task = tsk; \ + (waitbit)->wait.func = wake_bit_function; \ + INIT_LIST_HEAD(&(waitbit)->wait.task_list); \ } while (0) /** diff -puN kernel/wait.c~init-wait-bit-key kernel/wait.c --- linux-2.6.10-rc1/kernel/wait.c~init-wait-bit-key 2004-11-03 14:35:07.000000000 +0530 +++ linux-2.6.10-rc1-suparna/kernel/wait.c 2004-11-03 14:35:07.000000000 +0530 @@ -132,16 +132,9 @@ 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); _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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