linux-kernel - Re: [PATCH v2 3/6] pwm: lpss: Include headers we are direct user of

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Date:   Thu, 10 Nov 2022 08:21:44 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-pwm@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v2 3/6] pwm: lpss: Include headers we are direct user of

Hello,

On Tue, Nov 08, 2022 at 04:22:23PM +0200, Andy Shevchenko wrote:
> For the sake of integrity, include headers we are direct user of.
> 
> While at it, move the struct pwm_lpss_chip to be after
> the struct pwm_lpss_boardinfo as the former uses pointer
> to the latter.

That part is fine.

> Replace device.h with a forward declaration in order to improve
> the compilation time due to reducing overhead of device.h parsing
> with entire train of dependencies.

Together with "For the sake of integrity, include headers we are direct
user of." this makes an a bit schizophrenic impression on me. You add
<linux/types.h> because the file is a direct user of it, but you drop
<linux/device.h> despite being a direct user.

If you adapt the reasoning to something like:

Replace the inclusion of <linux/device.h> by a forward declaration of
struct device plus a (cheaper) #include of <linux/types.h> as
<linux/device.h> is an expensive include (measured in compiler effort).

I could better live with it. I would even split this into two patches
then. (i.e. move struct pwm_lpss_chip vs the include and forward change)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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