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block: remove 'magic' from struct blk_plug

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I don't think we've ever caught any bugs with this, and there's the
list poisoning for the plug lists to catch uninitialized cases.
So remove the magic member and save 8 bytes in the struct.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-05-29 08:09:00 -06:00
commit 4d92a9beb3
2 changed files with 0 additions and 6 deletions
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include/linux/blkdev.h
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@ -1060,7 +1060,6 @@ static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
* schedule() where blk_schedule_flush_plug() is called.
*/
struct blk_plug {
unsigned long magic; /* detect uninitialized use-cases */
struct list_head list; /* requests */
struct list_head mq_list; /* blk-mq requests */
struct list_head cb_list; /* md requires an unplug callback */