linux-kernel - Re: [PATCH 2/6 v3] cfq-iosched: Introduce cfq

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Message-ID: <20110118212056.GK27946@redhat.com>
Date:	Tue, 18 Jan 2011 16:20:56 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Chad Talbott <ctalbott@...gle.com>,
	Nauman Rafique <nauman@...gle.com>,
	Divyesh Shah <dpshah@...gle.com>, jmoyer@...hat.com,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH 2/6 v3] cfq-iosched: Introduce cfq_entity for CFQ group

On Mon, Dec 27, 2010 at 04:50:51PM +0800, Gui Jianfeng wrote:

[..]
> -static struct cfq_group *cfq_rb_first_group(struct cfq_rb_root *root)
> +static struct cfq_entity *cfq_rb_first_entity(struct cfq_rb_root *root)
>  {
>  	if (!root->left)
>  		root->left = rb_first(&root->rb);
>  
>  	if (root->left)
> -		return rb_entry_cfqg(root->left);
> +		return rb_entry_entity(root->left);
>  

Why are we defining cfq_rb_first_entity(). Can't we simply use cfq_rb_first()
as introduced in first patch.

Thanks
Vivek
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