linux-kernel - [PATCH] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete

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Date:	Thu, 25 Aug 2011 15:09:17 +0800
From:	Tao Ma <tm@....ma>
To:	linux-kernel@...r.kernel.org
Cc:	Jens Axboe <jaxboe@...ionio.com>
Subject: [PATCH] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete_request.

From: Tao Ma <boyu.mt@...bao.com>

In __blk_complete_request, we check both QUEUE_FLAG_SAME_COMP and req->cpu
to decide whether we should use req->cpu. Actually the user can also
select the complete cpu by either setting BIO_CPU_AFFINE or by calling
bio_set_completion_cpu. Current solution makes these 2 ways don't work
any more. So we'd better just check req->cpu.

Cc: Jens Axboe <jaxboe@...ionio.com>
Signed-off-by: Tao Ma <boyu.mt@...bao.com>
---
 block/blk-softirq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block/blk-softirq.c b/block/blk-softirq.c
index 58340d0..1366a89 100644
--- a/block/blk-softirq.c
+++ b/block/blk-softirq.c
@@ -115,7 +115,7 @@ void __blk_complete_request(struct request *req)
 	/*
 	 * Select completion CPU
 	 */
-	if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) && req->cpu != -1) {
+	if (req->cpu != -1) {
 		ccpu = req->cpu;
 		if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags)) {
 			ccpu = blk_cpu_to_group(ccpu);
-- 
1.7.1

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