linux-kernel - Re: [PATCH v2] mtd: cmdlinepart: fix the wrong partitions number when truncating occurs

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Message-ID: <CAMiH66HyfNEzEHGyZUcLJ_01PNVHqA44fjAqXsyM2c-HHms8hQ@mail.gmail.com>
Date:	Sat, 25 Aug 2012 05:26:51 -0400
From:	Huang Shijie <shijie8@...il.com>
To:	Shmulik Ladkani <shmulik.ladkani@...il.com>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, dedekind1@...il.com
Subject: Re: [PATCH v2] mtd: cmdlinepart: fix the wrong partitions number when
 truncating occurs

On Sat, Aug 25, 2012 at 5:02 AM, Shmulik Ladkani
<shmulik.ladkani@...il.com> wrote:
> Hi Huang,
>
> On Sat, 25 Aug 2012 10:26:07 -0400 Huang Shijie <shijie8@...il.com> wrote:
>> diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
>> index 4558e0f..fc960a3 100644
>> --- a/drivers/mtd/cmdlinepart.c
>> +++ b/drivers/mtd/cmdlinepart.c
>> @@ -344,7 +344,8 @@ static int parse_cmdline_partitions(struct mtd_info *master,
>>                                              "%s: partitioning exceeds flash size, truncating\n",
>>                                              part->mtd_id);
>>                                       part->parts[i].size = master->size - offset;
>> -                                     part->num_parts = i;
>> +                                     part->num_parts = i + 1;
>> +                                     break;
>
> Your analysis seems right, but let me offer an alternative approach.
>
> I would simply:
>
> -                                       part->num_parts = i;
your code does not wors in such kernel command line(also with the 1GB
nand chip):
#gpmi-nand:100m(root),100m(kernel),1g(rootfs),1g(user),-(rest)

For you see, we must keep the code robust enough. It should passes all
the possible kernel command lines.




>
> (and not replace it with anything).
>
> The specified cmdline partitions might not be ordered (according to
> start offset), so next partition specified after the truncated one might
> define a partition at the beginning of the device, which is okay
> (regardless the truncation of current partition).
could you please give me an example of this specified cmdline?

I can test it.

Best Regards
Huang Shijie

>
> Your patch skips the definitions of next partitions, which can be legit.
>
> I agree specifying "unsorted" partitions is not commonly used (and it
> might make no sense when using the "remaining" syntax), but it is legit
> to define all partitions _explicitly_ with their size@...set in an
> unordered fashion.
>
> Regards,
> Shmulik
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