linux-kernel - Re: [PATCH] mtd: mtdswap: use MTDSWAP_ECNT

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Date:   Sun, 25 Dec 2016 14:49:12 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Geliang Tang <geliangtang@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: mtdswap: use MTDSWAP_ECNT_MIN/MAX

On 12/24/2016 04:18 PM, Geliang Tang wrote:
> On Fri, Dec 23, 2016 at 07:51:56PM +0100, Marek Vasut wrote:
>> On 12/20/2016 02:54 PM, Geliang Tang wrote:
>>> Since macros MTDSWAP_ECNT_MIN() and MTDSWAP_ECNT_MAX() have been
>>> defined in mtdswap.c, use them instead of open-coding.
>>>
>>> Signed-off-by: Geliang Tang <geliangtang@...il.com>
>>
>> Sorry for getting to this so late. The patch is fine, but if you grep
>> for 'rb_first' in the mtdswap driver , you'll see you can also use the
>> MTDSWAP_ECNT_MIN macro in mtdswap_map_free_block() and in
>> mtdswap_pick_gc_blk() . Can you fix those too ?
> 
> Hi Marek,
> 
> Thanks for your review. I double checked the code and found out that we can't
> use MTDSWAP_ECNT_MIN macro in mtdswap_map_free_block() and mtdswap_pick_gc_eblk().
> Since the MTDSWAP_ECNT_MIN macro points to erase_count field of swap_eb, and
> erase_count field are not used in these two functions. Isn't it?

Ah, true, I missed that. In that case, just this patch is fine, thanks !

> -Geliang
> 
>>
>> Otherwise:
>> Acked-by: Marek Vasut <marek.vasut@...il.com>
>>
>>> ---
>>>  drivers/mtd/mtdswap.c | 6 ++----
>>>  1 file changed, 2 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
>>> index c40e2c9..f12879a 100644
>>> --- a/drivers/mtd/mtdswap.c
>>> +++ b/drivers/mtd/mtdswap.c
>>> @@ -1235,10 +1235,8 @@ static int mtdswap_show(struct seq_file *s, void *data)
>>>  
>>>  		if (root->rb_node) {
>>>  			count[i] = d->trees[i].count;
>>> -			min[i] = rb_entry(rb_first(root), struct swap_eb,
>>> -					rb)->erase_count;
>>> -			max[i] = rb_entry(rb_last(root), struct swap_eb,
>>> -					rb)->erase_count;
>>> +			min[i] = MTDSWAP_ECNT_MIN(root);
>>> +			max[i] = MTDSWAP_ECNT_MAX(root);
>>>  		} else
>>>  			count[i] = 0;
>>>  	}
>>>
>>
>>
>> -- 
>> Best regards,
>> Marek Vasut


-- 
Best regards,
Marek Vasut