linux-kernel - Re: users of drivers/misc/echo ?

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Message-Id: <07afd3cb-3ab1-4dc9-b0c1-3fef2d52f60b@app.fastmail.com>
Date: Sun, 23 Feb 2025 21:38:12 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: linux <linux@...blig.org>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, david@...etel.com,
 "Harald Welte" <laforge@...monks.org>
Subject: Re: users of drivers/misc/echo ?

On Sun, Feb 23, 2025, at 18:23, Dr. David Alan Gilbert wrote:
> Hi,
>   I can't see anything that uses drivers/misc/echo - should it go or
> is there something out of tree using it?
>
>   I see where Greg moved it from staging into the main kernel
> but am not seeing anything include the headers or call any of the symbols.

Good catch!

I don't see any in-tree users for it either, but I found one
project using the exported symbols, and there is a debian
package for it as well:

https://tracker.debian.org/pkg/osmocom-dahdi-linux
https://gitea.osmocom.org/retronetworking/dahdi-linux/src/branch/master/drivers/dahdi/dahdi_echocan_oslec.c#L34

With our normal rules, we should just remove it as there is no
way to use the code without external modules, but I don't know
how we even got to this state.

Adding Harald to Cc, might know more about it.

       Arnd