linux-kernel - Re: [PATCH 2/6] UBI: Fastmap: Don't allocate new ubi_wl

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Date:	Mon, 08 Dec 2014 11:37:25 +0200
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	Richard Weinberger <richard@....at>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] UBI: Fastmap: Don't allocate new ubi_wl_entry objects

On 12/8/2014 11:14 AM, Richard Weinberger wrote:
> Am 08.12.2014 um 09:36 schrieb Tanya Brokhman:
>> On 11/30/2014 1:35 PM, Richard Weinberger wrote:
>>> There is no need to allocate new ones every time, we can reuse
>>> the existing ones.
>>> This makes the code cleaner and more easy to follow.
>>>
>>> Signed-off-by: Richard Weinberger <richard@....at>
>>> ---
>>>    drivers/mtd/ubi/fastmap.c | 31 +++++--------------------------
>>>    drivers/mtd/ubi/wl.c      | 11 +++++++----
>>>    2 files changed, 12 insertions(+), 30 deletions(-)
>>>
>>> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
>>> index db3defd..9507702 100644
>>> --- a/drivers/mtd/ubi/fastmap.c
>>> +++ b/drivers/mtd/ubi/fastmap.c
>>> @@ -1446,19 +1446,6 @@ int ubi_update_fastmap(struct ubi_device *ubi)
>>>        }
>>>
>>>        new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
>>
>> Not related to this patch, but looking at this function it got me thinking: why do we need to re-calculate new_fm->used_blocks (and check calculated value) each time? fm_size
>> doesn't changed at runtime. leb_size sure does not, so fm->used_blocks can be ubi device parameter and calculated & tested only once, and not each time we write fastmap. Correct?
>
> If you dig deeper into the patch set you'll notice that the fastmap size can change. :-)
>

oh, ok. sorry, still in the middle of the review.

> Thanks,
> //richard
>


Thanks,
Tanya Brokhman
-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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