Commit 4c8fc196 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: remove the get_cpu/put_cpu pair in blk_mq_complete_request 



We don't really care if we get migrated during the I/O completion.
In the worth case we either perform an IPI that wasn't required, or
complete the request on a CPU which we just migrated off.

Reviewed-by: default avatarDaniel Wagner <dwagner@suse.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 15f73f5b

block/blk-mq.c

+1 −2
Original line number Diff line number Diff line
@@ -685,7 +685,7 @@ void blk_mq_complete_request(struct request *rq) 
		return;

	}



	cpu = get_cpu();

	cpu = raw_smp_processor_id();

	if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags))

		shared = cpus_share_cache(cpu, ctx->cpu);
@@ -697,7 +697,6 @@ void blk_mq_complete_request(struct request *rq) 
	} else {

		__blk_mq_complete_request(rq);

	}

	put_cpu();

}

EXPORT_SYMBOL(blk_mq_complete_request);