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Date: Fri, 15 Dec 2023 18:08:23 +0200
From: Andy Shevchenko <>
Cc: Kees Cook <>,,, Nick DeSaulniers <>,
	Andrew Morton <>,
Subject: Re: [PATCH v2 2/2] lib/string: shrink lib/string.i via IWYU

On Thu, Dec 14, 2023 at 09:06:13PM +0000, wrote:
> This diff uses an open source tool include-what-you-use (IWYU) to modify
> the include list changing indirect includes to direct includes.
> IWYU is implemented using the IWYUScripts github repository which is a tool that is
> currently undergoing development. These changes seek to improve build times.
> This change to lib/string.c resulted in a preprocessed size of
> lib/string.i from 26371 lines to 5259 lines (-80%) for the x86
> defconfig.

> Link:
> Signed-off-by: Tanzir Hasan <>

Tag block should not have blank line(s).

>  #include <linux/types.h>
> -#include <linux/string.h>
> -#include <linux/ctype.h>
> -#include <linux/kernel.h>
> -#include <linux/export.h>
> +#include <linux/bits.h>
>  #include <linux/bug.h>
>  #include <linux/errno.h>
> -#include <linux/slab.h>
> -
> +#include <asm/rwonce.h>
> +#include <linux/linkage.h>
> +#include <linux/stddef.h>
> +#include <vdso/limits.h>
> +#include <linux/string.h>
> +#include <linux/ctype.h>
>  #include <asm/unaligned.h>
> -#include <asm/byteorder.h>
>  #include <asm/word-at-a-time.h>
>  #include <asm/page.h>

My gosh, this becomes unreadable!

Please make sure you go with groups of headers from more generic to more
particular, i.e.




BUT, why the heck vdso? It should be rather uapi/ or regular linux/.

With Best Regards,
Andy Shevchenko

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