Re: [PATCH] iio: chemical: scd30: remove kernel.h header

["Maxwell Doose" <m32285159@gmail.com>]

On Sun Jul 12, 2026 at 11:52 AM CDT
Joshua Crofts <joshua.crofts1@gmail.com> wrote:

> On Sun, 12 Jul 2026 11:42:25 -0500
> Maxwell Doose <m32285159@gmail.com> wrote:
>
>> kernel.h is no longer recommended for usage because it can cause longer
>> build times and pull in transient dependencies. In addition, it's not
>> being used by the SCD30 driver. Remove it.
>> 
>> Signed-off-by: Maxwell Doose <m32285159@gmail.com>
>> ---
>>  drivers/iio/chemical/scd30_core.c | 1 -
>>  1 file changed, 1 deletion(-)
>> 
>> diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c
>> index f85cdd8bd84f..40bbf26a667b 100644
>> --- a/drivers/iio/chemical/scd30_core.c
>> +++ b/drivers/iio/chemical/scd30_core.c
>> @@ -23,7 +23,6 @@
>>  #include <linux/interrupt.h>
>>  #include <linux/irqreturn.h>
>>  #include <linux/jiffies.h>
>> -#include <linux/kernel.h>
>>  #include <linux/module.h>
>>  #include <linux/mutex.h>
>>  #include <linux/regulator/consumer.h>
>
> Since you're doing IWYU stuff, you should also remove errno.h and
> add err.h instead, as the code uses IS_ERR() etc. and err.h includes
> errno.h
>

I tried to set up iwyu-tool to no avail, but I can send a v2 with that.

> Also consider grouping the iio headers and asm headers separately.
> (separate patch though). The include list looks overwhelming!

Indeed it is but we try our best. Good thing is the more we remove
unneeded headers the better it gets.

-- 
best regards,
max