linux-kernel - Re: [PATCH v5 0/4] arch/x86: Remove unnecessary dependencies on bootparam.h

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Date: Mon, 15 Jan 2024 08:58:45 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: nathan@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 bhelgaas@...gle.com, arnd@...db.de, zohar@...ux.ibm.com,
 dmitry.kasatkin@...il.com, paul@...l-moore.com, jmorris@...ei.org,
 serge@...lyn.com, javierm@...hat.com, linux-arch@...r.kernel.org,
 linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org, linux-integrity@...r.kernel.org,
 linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 0/4] arch/x86: Remove unnecessary dependencies on
 bootparam.h

Hi

Am 12.01.24 um 18:28 schrieb Ard Biesheuvel:
> On Fri, 12 Jan 2024 at 10:50, Thomas Zimmermann <tzimmermann@...e.de> wrote:
>>
>> Reduce build time in some cases by removing unnecessary include statements
>> for <asm/bootparam.h>. Reorganize some header files accordingly.
>>
>> While working on the kernel's boot-up graphics, I noticed that touching
>> include/linux/screen_info.h triggers a complete rebuild of the kernel
>> on x86. It turns out that the architecture's PCI and EFI headers include
>> <asm/bootparam.h>, which depends on <linux/screen_info.h>. But none of
>> the drivers have any business with boot parameters or the screen_info
>> state.
>>
>> The patchset moves code from bootparam.h and efi.h into separate header
>> files and removes obsolete include statements on x86. I did
>>
>>    make allmodconfig
>>    make -j28
>>    touch include/linux/screen_info.h
>>    time make -j28
>>
>> to measure the time it takes to rebuild. Results without the patchset
>> are around 20 minutes.
>>
>>    real    20m46,705s
>>    user    354m29,166s
>>    sys     28m27,359s
>>
>> And with the patchset applied it goes down to less than one minute.
>>
>>    real    0m56,643s
>>    user    4m0,661s
>>    sys     0m32,956s
>>
>> The test system is an Intel i5-13500.
>>
>> v5:
>>          * silence clang warnings for real-mode code (Nathan)
>>          * revert boot/compressed/misc.h (kernel test robot)
>> v4:
>>          * fix fwd declaration in compressed/misc.h (Ard)
>> v3:
>>          * keep setup_header in bootparam.h (Ard)
>>          * implement arch_ima_efi_boot_mode() in source file (Ard)
>> v2:
>>          * only keep struct boot_params in bootparam.h (Ard)
>>          * simplify arch_ima_efi_boot_mode define (Ard)
>>          * updated cover letter
>>
>> Thomas Zimmermann (4):
>>    arch/x86: Move UAPI setup structures into setup_data.h
>>    arch/x86: Move internal setup_data structures into setup_data.h
>>    arch/x86: Implement arch_ima_efi_boot_mode() in source file
>>    arch/x86: Do not include <asm/bootparam.h> in several files
>>
> 
> This looks ok to me, thanks for sticking with it.
> 
> For the series,
> 
> Reviewed-by: Ard Biesheuvel <ardb@...nel.org>

Thank you so much. Can this series go through the x86 tree?

Best regards
Thomas

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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