linux-kernel - Re: [PATCH] mtd: fix size in mtd_info

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Date:   Fri, 16 Jul 2021 11:48:08 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     <richard@....at>, <vigneshr@...com>, <David.Woodhouse@...el.com>,
        <Artem.Bityutskiy@...ia.com>, <ext-adrian.hunter@...ia.com>,
        <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        <linfeilong@...wei.com>
Subject: Re: [PATCH] mtd: fix size in mtd_info_user to support 64-bit

Hi Miaohe,

Miaohe Lin <linmiaohe@...wei.com> wrote on Fri, 16 Jul 2021 09:42:19
+0800:

> On 2021/7/16 7:02, Miquel Raynal wrote:
> > Hi Miaohe,
> > 
> > Miaohe Lin <linmiaohe@...wei.com> wrote on Thu, 8 Jul 2021 21:13:59
> > +0800:
> >   
> >> From: Feilong Lin <linfeilong@...wei.com>
> >>
> >> The size in struct mtd_info_user is 32-bit, which will cause errors
> >> when obtaining the size of large-capacity MTD devices, such as TLC
> >> NAND FLASH-2048Gb.  
> > 
> > Besides the fact that such devices are far from being supported by the
> > Linux kernel, this change would basically break userspace, it cannot
> > enter as-is...
> >   
> 
> I see. Many thanks for your reply! We're working with these large-capacity
> MTD devices now, any suggestion to work around this?

The only way is to create a second UAPI.

Thanks,
Miquèl