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Date: Sun, 23 Aug 2026 18:52:19 +0100
From: Jonathan Cameron <jic23@kernel.org>
To: Joshua Crofts <joshua.crofts1@gmail.com>
Cc: David Lechner <dlechner@baylibre.com>, Nuno =?UTF-8?B?U8Oh?=
 <nuno.sa@analog.com>, Andy Shevchenko <andy@kernel.org>, Crt Mori
 <cmo@melexis.com>, Puranjay Mohan <puranjay@kernel.org>,
 linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 04/14] iio: temperature: ltc2983: make headers conform
 to IWYU
Message-ID: <20260823185219.222c7990@jic23-huawei>
In-Reply-To: <20260822-kernel-header-removal-v1-4-ee31b124be11@gmail.com>
References: <20260822-kernel-header-removal-v1-0-ee31b124be11@gmail.com>
	<20260822-kernel-header-removal-v1-4-ee31b124be11@gmail.com>
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On Sat, 22 Aug 2026 10:02:31 +0200
Joshua Crofts <joshua.crofts1@gmail.com> wrote:

> Remove the catch-all kernel.h header and add the missing headers to
> enforce IWYU.
> 
> Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>
> ---
> Header changes explained:
> Added:
> - <asm/div64.h>: for div64 functions
> - <linux/array_size.h>: for ARRAY_SIZE()
> - <linux/bits.h>: for GENMASK() and BIT() macros
> - <linux/mutex.h>: for struct mutex and mutex_lock/unlock
> - <linux/types.h>: for fixed-width integer types (u8, u16, etc.)
> Removed:
> - <linux/errno.h>: not directly used in this driver
> - <linux/kernel.h>: catch-all header no longer needed
> ---
>  drivers/iio/temperature/ltc2983.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
> index fe9eec3058d4..0b1b442bb133 100644
> --- a/drivers/iio/temperature/ltc2983.c
> +++ b/drivers/iio/temperature/ltc2983.c
> @@ -5,22 +5,26 @@
>   *
>   * Copyright 2019 Analog Devices Inc.
>   */
> +
> +#include <linux/array_size.h>
>  #include <linux/bitfield.h>
> +#include <linux/bits.h>
>  #include <linux/completion.h>
>  #include <linux/device.h>
>  #include <linux/err.h>
> -#include <linux/errno.h>
> -#include <linux/kernel.h>
>  #include <linux/interrupt.h>
>  #include <linux/list.h>
>  #include <linux/module.h>
> +#include <linux/mutex.h>
>  #include <linux/property.h>
>  #include <linux/regmap.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/spi/spi.h>
> +#include <linux/types.h>
>  #include <linux/unaligned.h>
>  
>  #include <asm/byteorder.h>
> +#include <asm/div64.h>

I think we normally use linux/math64.h for that one.


>  
>  #include <linux/iio/iio.h>
>  
>