From: Christoph Hellwig <hch@lst.de>
Date: Thu, 11 Jun 2020 08:44:48 +0200
Subject: [PATCH] blk-mq: remove the get_cpu/put_cpu pair in
blk_mq_complete_request
References: bsc#1175995,jsc#SLE-15608
Git-commit: 4c8fc19686dc761f600833fc9b8fa390eaf73dd5
Patch-mainline: v5.9-rc1
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>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
block/blk-mq.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3f4f227cf830..95125bfe779b 100644
--- 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);
--
2.16.4