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block: Introduce blk_queue_flag_{set,clear,test_and_{set,clear}}()

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Introduce functions that modify the queue flags and that protect
these modifications with the request queue lock. Except for moving
one wake_up_all() call from inside to outside a critical section,
this patch does not change any functionality.

Cc: Christoph Hellwig <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Ming Lei <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2018-03-07 17:10:04 -08:00 • committed by Jens Axboe
commit 8814ce8a0f
6 changed files with 93 additions and 49 deletions
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6
block/blk-settings.c
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@ -859,12 +859,10 @@ EXPORT_SYMBOL(blk_queue_update_dma_alignment);
void blk_queue_flush_queueable(struct request_queue *q, bool queueable)
{
spin_lock_irq(q->queue_lock);
if (queueable)
queue_flag_clear(QUEUE_FLAG_FLUSH_NQ, q);
blk_queue_flag_clear(QUEUE_FLAG_FLUSH_NQ, q);
else
queue_flag_set(QUEUE_FLAG_FLUSH_NQ, q);
spin_unlock_irq(q->queue_lock);
blk_queue_flag_set(QUEUE_FLAG_FLUSH_NQ, q);
}
EXPORT_SYMBOL_GPL(blk_queue_flush_queueable);