linux-kernel - Re: [PATCH] Input: applespi

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Message-ID: <20190730070117.GB20206@innovation.ch>
Date:   Tue, 30 Jul 2019 00:01:17 -0700
From:   "Life is hard, and then you die" <ronald@...ovation.ch>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     YueHaibing <yuehaibing@...wei.com>, nikolas@....org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH] Input: applespi - Fix build error


On Mon, Jul 29, 2019 at 04:04:38PM +0200, Dmitry Torokhov wrote:
> On Mon, Jul 29, 2019 at 11:14:55AM +0800, YueHaibing wrote:
> > If CONFIG_KEYBOARD_APPLESPI=y but CONFIG_LEDS_CLASS=m
> > building fails:
> > 
> > drivers/input/keyboard/applespi.o: In function `applespi_probe':
> > applespi.c:(.text+0x1fcd): undefined reference to `devm_led_classdev_register_ext'
> > 
> > Wrap it in LEDS_CLASS macro to fix this.
> 
> No, we should add "depends on LEDS_CLASS" to the Konfig instead.

While the loss of keyboard-backlight functionality is certainly not
critical, in practice when building a kernel for desktops/laptops
(i.e. where this module would be used) I see no real reason why you'd
not have/want LEDS_CLASS enabled. So I'd agree with Dmitry that a
Kconfig depends-on is probably the preferred approach.


  Cheers,

  Ronald