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Date: Tue, 5 Dec 2023 13:04:49 -0800
From: Andrew Morton <>
Cc: Kees Cook <>, Andy Shevchenko <>,,, Nick
 DeSaulniers <>,
Subject: Re: [PATCH] lib/string: shrink lib/string.i via IWYU

On Tue, 05 Dec 2023 20:58:53 +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 5232 lines (-80%).
> If there are any problems with the output of the tool please raise an
> issue on the github.
> Link:


> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -16,16 +16,16 @@
>  #define __NO_FORTIFY
>  #include <linux/types.h>
> +#include <asm/bitsperlong.h>

The preferred way to import bit-fiddling stuff is to include
<linux/bits.h>.  Under the hood this may include asm/bitsperlong.h.  Or
it may not, depending on Kconfig settings (particularly architecture).

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