linux-kernel - Re: [PATCH] serdev: fix builds with CONFIG_SERIAL_DEV

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Date:   Wed, 18 Dec 2019 10:06:06 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH] serdev: fix builds with CONFIG_SERIAL_DEV_BUS=m

On Wed, Dec 18, 2019 at 09:38:42AM +0100, Uwe Kleine-König wrote:
> Commit 54edb425346a ("serdev: simplify Makefile") broke builds with
> serdev configured as module. I don't understand it completely yet, but
> it seems that
> 
> 	obj-$(CONFIG_SERIAL_DEV_BUS) += serdev/
> 
> in drivers/tty/Makefile with CONFIG_SERIAL_DEV_BUS=m doesn't result in
> code that is added using obj-y in drivers/tty/serdev/Makefile being
> compiled. So instead of dropping $(CONFIG_SERIAL_DEV_BUS) in serdev's
> Makefile, drop it in drivers/tty/Makefile.

Why not simply revert the offending patch? There are some dependencies
here related to how the tty layer is built. If you're still not certain
on why things broke, I suggest just reverting for now.

You can send a follow-up clean up if you think that's warranted instead.

> Fixes: 54edb425346a ("serdev: simplify Makefile")
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
> Hello,
> 
> as Greg already added the offending patch to tty-next I assume it is
> frozen and cannot be dropped any more, so here is an incremental fix.

Johan