linux-kernel - Re: [PATCH v2 2/6] mfd: cs42l43: Tidy up header includes

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Date: Wed, 24 Jan 2024 22:57:49 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc: lee@...nel.org, broonie@...nel.org, alsa-devel@...a-project.org, 
	patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org, 
	linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 2/6] mfd: cs42l43: Tidy up header includes

On Wed, Jan 24, 2024 at 5:30 PM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:
>
> Use more forward declarations, move header guards to cover other
> includes, and rely less on including headers through other headers.

Thanks for doing this!
My comments below.

..

> +++ b/drivers/mfd/cs42l43.h

> -#include <linux/pm.h>
> -#include <linux/regmap.h>

> +struct dev_pm_ops;
> +struct reg_default;
> +
>  extern const struct dev_pm_ops cs42l43_pm_ops;
>  extern const struct reg_default cs42l43_reg_default[CS42L43_N_DEFAULTS];

As far as I understand C, these two changes are incorrect as the
header _is_ the user of them, i.e. it needs to know the definitions of
the used data types because they are not POD (plain old data) types.
But I will learn something new if I'm mistaken.

--
With Best Regards,
Andy Shevchenko