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Commit 4d92a9be authored by Jens Axboe's avatar Jens Axboe
Browse files

block: remove 'magic' from struct blk_plug



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: default avatarJens Axboe <axboe@fb.com>
parent cdef54dd
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+0 −5
Original line number Diff line number Diff line
@@ -2957,8 +2957,6 @@ int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
}
EXPORT_SYMBOL(kblockd_schedule_delayed_work_on);

#define PLUG_MAGIC	0x91827364

/**
 * blk_start_plug - initialize blk_plug and track it inside the task_struct
 * @plug:	The &struct blk_plug that needs to be initialized
@@ -2977,7 +2975,6 @@ void blk_start_plug(struct blk_plug *plug)
{
	struct task_struct *tsk = current;

	plug->magic = PLUG_MAGIC;
	INIT_LIST_HEAD(&plug->list);
	INIT_LIST_HEAD(&plug->mq_list);
	INIT_LIST_HEAD(&plug->cb_list);
@@ -3074,8 +3071,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
	LIST_HEAD(list);
	unsigned int depth;

	BUG_ON(plug->magic != PLUG_MAGIC);

	flush_plug_callbacks(plug, from_schedule);

	if (!list_empty(&plug->mq_list))
+0 −1
Original line number Diff line number Diff line
@@ -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 */