linux-kernel - Re: [PATCH] block/blk-merge.c: inverted likeliness in ll_back_merge

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Message-ID: <47D64041.7050903@tiscali.nl>
Date:	Tue, 11 Mar 2008 09:18:09 +0100
From:	Roel Kluin <12o3l@...cali.nl>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block/blk-merge.c: inverted likeliness in ll_back_merge_fn()

Jens Axboe wrote:
> On Tue, Mar 11 2008, Roel Kluin wrote:
>> In my likely profile it appears this one is inverted.
> 
> Depends entirely on the workload, it should be removed rather than
> inverted.
> 
---
Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 0f58616..7651c3b 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -305,7 +305,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
 	}
 	if (unlikely(!bio_flagged(req->biotail, BIO_SEG_VALID)))
 		blk_recount_segments(q, req->biotail);
-	if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
+	if (!bio_flagged(bio, BIO_SEG_VALID))
 		blk_recount_segments(q, bio);
 	len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
 	if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))

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