linux-kernel - Re: [PATCH v3 2/3] hwmon: da9063: HWMON driver

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Date:   Sun, 11 Jul 2021 04:44:19 +0000
From:   Vincent Pelletier <plr.vincent@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jean Delvare <jdelvare@...e.com>, Jonathan Corbet <corbet@....net>,
        Support Opensource <support.opensource@...semi.com>,
        Lee Jones <lee.jones@...aro.org>, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
Subject: Re: [PATCH v3 2/3] hwmon: da9063: HWMON driver

On Sun, 11 Jul 2021 02:55:02 +0000, Vincent Pelletier <plr.vincent@...il.com> wrote:
> On Sat, 10 Jul 2021 09:08:13 -0700, Guenter Roeck <linux@...ck-us.net> wrote:
> > Unnecessary include.  
> [...]
> > I don't immediately see where this include is needed. Is this a
> > leftover ?  
> [...]
> > Same here.  
> 
> Are there ways to systematically tell which includes are useless
> besides commenting them out all and uncommenting until it compiles ?
> (if that is even a good idea)

I tried this, just to get a baseline: the module compiles with just
  linux/hwmon.h
  linux/mfd/da9063/core.h
  linux/module.h
  linux/platform_device.h
  linux/regmap.h

Beyond what you suggested this also gets rid of:
- seems reasonable:
  - linux/delay.h
  - linux/init.h
  - linux/slab.h
- looks suspicious to me:
  - linux/err.h, which means the error constants are indirectly
    imported. Removing it feels brittle.
  - linux/kernel.h, although to my surprise a lot of c files do not
    include it.

By default I'll drop the former and keep the latter in the
next version, please let me know if another combination is preferred.
-- 
Vincent Pelletier
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