linux-kernel - Re: [PATCH] usb: get rid of 'choice' for legacy gadget drivers

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Date:   Mon, 16 Mar 2020 08:19:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Johan Hovold <johan@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: [PATCH] usb: get rid of 'choice' for legacy gadget drivers

On Mon, Mar 16, 2020 at 09:05:12AM +0200, Felipe Balbi wrote:
> 
> Hi,
> 
> Masahiro Yamada <masahiroy@...nel.org> writes:
> > drivers/usb/gadget/legacy/Kconfig creates a 'choice' inside another
> > 'choice'.
> >
> > The outer choice: line 17 "USB Gadget precomposed configurations"
> > The inner choice: line 484 "EHCI Debug Device mode"
> >
> > I wondered why the whole legacy gadget drivers reside in such a big
> > choice block.
> >
> > This dates back to 2003, "[PATCH] USB: fix for multiple definition of
> > `usb_gadget_get_string'". [1]
> >
> > At that time, the global function, usb_gadget_get_string(), was linked
> > into multiple drivers. That was why only one driver was able to become
> > built-in at the same time.
> >
> > Later, commit a84d9e5361bc ("usb: gadget: start with libcomposite")
> > moved usb_gadget_get_string() to a separate module, libcomposite.ko
> > instead of including usbstring.c from multiple modules.
> >
> > More and more refactoring was done, and after commit 1bcce939478f
> > ("usb: gadget: multi: convert to new interface of f_mass_storage"),
> > you can link multiple gadget drivers into vmlinux without causing
> > multiple definition error.
> >
> > This is the only user of the nested choice structure ever. Removing
> > this mess will make some Kconfig cleanups possible.
> >
> > [1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=fee4cf49a81381e072c063571d1aadbb29207408
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> 
> Greg, if you want to pick this for v5.7, please go ahead:
> 
> Acked-by: Felipe Balbi <balbi@...nel.org>

Thanks, will take it later today.

greg k-h