linux-kernel - Re: [PATCH v2] x86/vdso: shrink vdso/vdso32-setup.i via IWYU

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Date: Mon, 8 Jan 2024 23:58:52 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Tanzir Hasan <tanzhasanwork@...il.com>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Nick Desaulniers <nnn@...gle.com>,
	linux-kernel@...r.kernel.org,
	Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2] x86/vdso: shrink vdso/vdso32-setup.i via IWYU

Hi,

On Thu, Jan 04, 2024 at 08:46:25PM +0000, Tanzir Hasan 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 vdso/vdso32-setup.c resulted in a preprocessed size of
> vdso/vdso32-setup.i from 44009 lines to 18572 lines (-58%) for the x86
> defconfig.
>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Tanzir Hasan <tanzirh@...gle.com>
> ---
> Changes in v2:
> - Fixed messed up signed-off-by tag
> - Link to v1: https://lore.kernel.org/r/20240104-vdso32setup-v1-1-1737147bc6ed@google.com
> ---

I built 10 x86_64 randconfigs with KCONFIG_SEEDs:
1: 0xF411D996
2: 0x47DADF74
3: 0x431DBDD9
4: 0xC411E812
5: 0x308B62A0
6: 0xD91AA814
7: 0x11DF23E8
8: 0x629EBA88
9: 0x4B88CEC8
10: 0xED145212

They all built just fine.

Tested-by: Justin Stitt <justinstitt@...gle.com>

As for the semantics of this patch, dropping a giant header like
kernel.h seems great and the rest of the includes are reasonable. For
that,

Reviewed-by: Justin Stitt <justinstitt@...gle.com>

>  arch/x86/entry/vdso/vdso32-setup.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/entry/vdso/vdso32-setup.c b/arch/x86/entry/vdso/vdso32-setup.c
> index 76e4e74f35b5..8dbe022589a6 100644
> --- a/arch/x86/entry/vdso/vdso32-setup.c
> +++ b/arch/x86/entry/vdso/vdso32-setup.c
> @@ -8,13 +8,11 @@
>   */
>
>  #include <linux/init.h>
> -#include <linux/smp.h>
> -#include <linux/kernel.h>
> -#include <linux/mm_types.h>
> -#include <linux/elf.h>
> +#include <linux/kstrtox.h>
> +#include <linux/printk.h>
> +#include <linux/stddef.h>
>
> -#include <asm/processor.h>
> -#include <asm/vdso.h>
> +#include <asm/cache.h>
>
>  #ifdef CONFIG_COMPAT_VDSO
>  #define VDSO_DEFAULT	0
>
> ---
> base-commit: f5837722ffecbbedf1b1dbab072a063565f0dad1
> change-id: 20231228-vdso32setup-8e336d60ac3e
>
> Best regards,
> --
> Tanzir Hasan <tanzirh@...gle.com>
>
Thanks
Justin