linux-kernel - Re: [PATCH] [RFC] UBI: Kill data type hint

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Message-ID: <4FAFD326.4020406@nod.at>
Date:	Sun, 13 May 2012 17:28:38 +0200
From:	Richard Weinberger <richard@....at>
To:	Artem Bityutskiy <dedekind1@...il.com>
CC:	linux-mtd@...ts.infradead.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] UBI: Kill data type hint

Am 13.05.2012 16:41, schrieb Artem Bityutskiy:
> Hi Richard,
>
> On Fri, 2012-05-11 at 14:14 +0200, Richard Weinberger wrote:
>>   struct ubi_map_req {
>>          __s32 lnum;
>> -       __s8  dtype;
>> -       __s8  padding[3];
>> +       __s8  padding[4];
>>   } __packed;
>
>
> The "dtype" field is part of ABI, and merging it with padding is bad
> because padding holds "free" fields, which can be used in future. But
> "dtype" is not really free. I think it should stay here. You should put
> a comment explaining that it was used in the past for this and that, but
> now unused and ignored by UBI. Probably a date when we stopped using it
> would also be good.

Oh, it's ABI. Then I'll keep it and mark it as obsolete.

> May be it even deserves to be in a separate patches for this one and
> ubi_leb_change_req ?

Indeed.

Thanks,
//richard
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