linux-kernel - Re: [PATCH] usb: hide usb_of_get_companion_dev for CONFIG

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Date:   Tue, 14 Aug 2018 16:26:30 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     gregkh <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        yoshihiro.shimoda.uh@...esas.com, Johan Hovold <johan@...nel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: hide usb_of_get_companion_dev for CONFIG_USB=n

On Tue, Aug 14, 2018 at 3:58 PM Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 13 Aug 2018, Arnd Bergmann wrote:
> > diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
> > index 0a16cbd4e528..663a8bd67a7b 100644
> > --- a/drivers/usb/gadget/udc/Kconfig
> > +++ b/drivers/usb/gadget/udc/Kconfig
> > @@ -193,6 +193,7 @@ config USB_RENESAS_USB3
> >       tristate 'Renesas USB3.0 Peripheral controller'
> >       depends on ARCH_RENESAS || COMPILE_TEST
> >       depends on EXTCON
> > +     depends on USB || !USB
>
> Is this some weird standard idiom?  It looks really strange.

Yes, and yes.

A less common way to write it is

        depends on (USB != m) || m

which some people prefer, but I find even weirder.

       Arnd