From: Andrew Morton <akpm@osdl.org>
Date: Wed, 22 Mar 2006 07:08:01 +0000 (+0100)
Subject: [PATCH] blk_execute_rq_nowait-speedup
X-Git-Tag: firefly_0821_release~36699^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4c5d0bbde9669cfb7f7fd4670dc9a117aea90384;p=firefly-linux-kernel-4.4.55.git

[PATCH] blk_execute_rq_nowait-speedup

Both elv_add_request() and generic_unplug_device() grab the queue lock
and disable interrupts, do that locally and use the __ variants.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jens Axboe <axboe@suse.de>
---

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index b836b43113da..7fc903b5f3cd 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -2477,10 +2477,12 @@ void blk_execute_rq_nowait(request_queue_t *q, struct gendisk *bd_disk,
 	rq->rq_disk = bd_disk;
 	rq->flags |= REQ_NOMERGE;
 	rq->end_io = done;
-	elv_add_request(q, rq, where, 1);
-	generic_unplug_device(q);
+	WARN_ON(irqs_disabled());
+	spin_lock_irq(q->queue_lock);
+	__elv_add_request(q, rq, where, 1);
+	__generic_unplug_device(q);
+	spin_unlock_irq(q->queue_lock);
 }
-
 EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
 
 /**