linux-kernel - Re: [PATCH 0/8] add generic builtin command line

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Date:   Thu, 27 Sep 2018 19:05:44 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Maksym Kokhan <maksym.kokhan@...ballogic.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Daniel Walker <dwalker@...o99.com>,
        Daniel Walker <danielwa@...co.com>,
        Andrii Bordunov <aborduno@...co.com>,
        Ruslan Bilovol <rbilovol@...co.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-mips <linux-mips@...ux-mips.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 0/8] add generic builtin command line

On 27 September 2018 at 18:55, Maksym Kokhan
<maksym.kokhan@...ballogic.com> wrote:
> There were series of patches [1] for 4.3.0-rc3, that allowed
> architectures to use a generic builtin command line. I have rebased
> these patches on kernel 4.19.0-rc4.
>

Could you please elaborate on the purpose of this series? Is it simply
to align between architectures? Does it solve an actual problem?

> Things, modified in comparison with original patches:
> * There was some bug for mips, in the case when CONFIG_CMDLINE_PREPEND
> and CONFIG_CMDLINE_APPEND are empty and CMDLINE_OVERRIDE is not set,
> command line from bootloader was ignored, so I fixed it, modifying
> patch "add generic builtin command line".
>
> * Implemented new patch to resolve conflict with new kernel, which
> modify EFI stub code. Unfortunately, I don't have capability to test
> this modification on real arm board with EFI.
>
> * Removed new realisation of mips builtin command line, which was
> created after 4.3.0-rc3.
>
> * Kernel 4.3.0-rc3 with original patches could not be compiled for
> powerpc due to prom_init.c checking by prom_init_check.sh. So I added
> strlcat (which is used by cmdline_add_builtin macro) to
> prom_init_check.sh whitelist.
>
> Patches have been tested in QEMU for x86, arm (little-endian), arm64
> (little-endian), mips (little-endian, 32-bit) and powerpc
> (big-endian, 64-bit), everything works perfectly. Also it was tested
> on linux-next (next-20180924 tag) for all listed above architectures.
>
> [1] : https://lore.kernel.org/patchwork/patch/604992/
>
> Daniel Walker (7):
>   add generic builtin command line
>   drivers: of: ifdef out cmdline section
>   x86: convert to generic builtin command line
>   arm: convert to generic builtin command line
>   arm64: convert to generic builtin command line
>   mips: convert to generic builtin command line
>   powerpc: convert to generic builtin command line
>
> Maksym Kokhan (1):
>   efi: modify EFI stub code for arm/arm64
>
>  arch/arm/Kconfig                        | 38 +-----------------
>  arch/arm/kernel/atags_parse.c           | 14 ++-----
>  arch/arm/kernel/devtree.c               |  2 +
>  arch/arm64/Kconfig                      | 17 +-------
>  arch/arm64/kernel/setup.c               |  3 ++
>  arch/mips/Kconfig                       | 24 +----------
>  arch/mips/Kconfig.debug                 | 47 ----------------------
>  arch/mips/kernel/setup.c                | 41 ++-----------------
>  arch/powerpc/Kconfig                    | 23 +----------
>  arch/powerpc/kernel/prom.c              |  4 ++
>  arch/powerpc/kernel/prom_init.c         |  8 ++--
>  arch/powerpc/kernel/prom_init_check.sh  |  2 +-
>  arch/x86/Kconfig                        | 44 +--------------------
>  arch/x86/kernel/setup.c                 | 19 ++-------
>  drivers/firmware/efi/libstub/arm-stub.c | 10 ++---
>  drivers/of/fdt.c                        |  2 +-
>  include/linux/cmdline.h                 | 70 +++++++++++++++++++++++++++++++++
>  init/Kconfig                            | 68 ++++++++++++++++++++++++++++++++
>  18 files changed, 173 insertions(+), 263 deletions(-)
>  create mode 100644 include/linux/cmdline.h
>
> --
> 2.7.4
>