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: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3f4f227cf830c7ba4a2fbb49c2d2ac80a7f5dab5..95125bfe779b0cae976141781e4a1ebd896f3cf8 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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);