linux-kernel - Re: [PATCH] zram: Allow backing device to be assigned after init

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Message-Id: <20211001162204.f8d20e62e8b528f5e2e5fa3e@linux-foundation.org>
Date:   Fri, 1 Oct 2021 16:22:04 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Brian Geffon <bgeffon@...gle.com>
Cc:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-block@...r.kernel.org,
        Suleiman Souhlal <suleiman@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>
Subject: Re: [PATCH] zram: Allow backing device to be assigned after init

On Fri,  1 Oct 2021 11:16:27 -0700 Brian Geffon <bgeffon@...gle.com> wrote:

> There does not appear to be a technical reason to not
> allow the zram backing device to be assigned after the
> zram device is initialized.
> 
> This change will allow for the backing device to be assigned
> as long as no backing device is already assigned. In that
> event backing_dev would return -EEXIST.

Why is this useful?