From: Israel Rukshin <israelr@mellanox.com>
Date: Sun, 13 Oct 2019 16:57:33 +0000 (+0300)
Subject: nvmet: add unlikely check at nvmet_req_alloc_sgl
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e522f446027845e3c8b563d021f37e8f3d30c9d9;p=linux.git

nvmet: add unlikely check at nvmet_req_alloc_sgl

The call to sgl_alloc shouldn't fail so add this simple optimization to
the fast path.

Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 3a67e244e5685..6b39cfc6ade19 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -966,7 +966,7 @@ int nvmet_req_alloc_sgl(struct nvmet_req *req)
 	}
 
 	req->sg = sgl_alloc(req->transfer_len, GFP_KERNEL, &req->sg_cnt);
-	if (!req->sg)
+	if (unlikely(!req->sg))
 		return -ENOMEM;
 
 	return 0;