linux-kernel - Re: [PATCH 1/3] raid: replace list_for_each_continue

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Message-ID: <504DA513.2060004@linux.vnet.ibm.com>
Date:	Mon, 10 Sep 2012 16:30:11 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-raid@...r.kernel.org
CC:	neilb@...e.de,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/3] raid: replace	list_for_each_continue_rcu with new
 interface

On 08/24/2012 08:51 AM, Michael Wang wrote:
> On 08/17/2012 12:33 PM, Michael Wang wrote:
>> From: Michael Wang <wangyun@...ux.vnet.ibm.com>
>>
>> This patch replaces list_for_each_continue_rcu() with
>> list_for_each_entry_continue_rcu() to save a few lines
>> of code and allow removing list_for_each_continue_rcu().
>>
> 
> Hi, Neil
> 
> Could I get some comments on this patch?

Hi, Neil

Could I get some comments?

And please forgive and warn me if this patch has came to the wrong
place...I get the address from get_maintainer.

Regards,
Michael Wang

> 
> Regards,
> Michael Wang
> 
>> Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
>> ---
>>  drivers/md/bitmap.c |    9 +++------
>>  1 files changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
>> index 15dbe03..b160828 100644
>> --- a/drivers/md/bitmap.c
>> +++ b/drivers/md/bitmap.c
>> @@ -163,20 +163,17 @@ static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mdde
>>  	 * As devices are only added or removed when raid_disk is < 0 and
>>  	 * nr_pending is 0 and In_sync is clear, the entries we return will
>>  	 * still be in the same position on the list when we re-enter
>> -	 * list_for_each_continue_rcu.
>> +	 * list_for_each_entry_continue_rcu.
>>  	 */
>> -	struct list_head *pos;
>>  	rcu_read_lock();
>>  	if (rdev == NULL)
>>  		/* start at the beginning */
>> -		pos = &mddev->disks;
>> +		rdev = list_entry_rcu(&mddev->disks, struct md_rdev, same_set);
>>  	else {
>>  		/* release the previous rdev and start from there. */
>>  		rdev_dec_pending(rdev, mddev);
>> -		pos = &rdev->same_set;
>>  	}
>> -	list_for_each_continue_rcu(pos, &mddev->disks) {
>> -		rdev = list_entry(pos, struct md_rdev, same_set);
>> +	list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) {
>>  		if (rdev->raid_disk >= 0 &&
>>  		    !test_bit(Faulty, &rdev->flags)) {
>>  			/* this is a usable devices */
>>
> 

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