linux-kernel - Re: [PATCH v4 01/11] mtd: core: always create master device

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Message-ID: <87sepwp6d9.fsf@bootlin.com>
Date: Mon, 06 Jan 2025 11:46:26 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Alexander Usyskin <alexander.usyskin@...el.com>
Cc: Richard Weinberger <richard@....at>,  Vignesh Raghavendra
 <vigneshr@...com>,  Lucas De Marchi <lucas.demarchi@...el.com>,  Thomas
 Hellström <thomas.hellstrom@...ux.intel.com>,  Rodrigo
 Vivi
 <rodrigo.vivi@...el.com>,  Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>,  Maxime Ripard <mripard@...nel.org>,
  Thomas Zimmermann <tzimmermann@...e.de>,  David Airlie
 <airlied@...il.com>,  Simona Vetter <simona@...ll.ch>,  Jani Nikula
 <jani.nikula@...ux.intel.com>,  Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>,  Tvrtko Ursulin <tursulin@...ulin.net>,
  Karthik Poosa <karthik.poosa@...el.com>,  Reuven Abliyev
 <reuven.abliyev@...el.com>,  Oren Weil <oren.jer.weil@...el.com>,
  linux-mtd@...ts.infradead.org,  dri-devel@...ts.freedesktop.org,
  intel-gfx@...ts.freedesktop.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/11] mtd: core: always create master device

Hi Alexander,

On 01/01/2025 at 17:39:15 +02, Alexander Usyskin <alexander.usyskin@...el.com> wrote:

> Create master device without partition when
> CONFIG_MTD_PARTITIONED_MASTER flag is unset.

I don't think you took into consideration my remarks regarding the fact
that you would break userspace. If you enable the master, you no longer
have the same device numbering in userspace. I know people should not
care about these numbers, but in practice they do.

If I'm wrong, please be a little more verbose about why :)

Thanks,
Miquèl