linux-kernel - Re: [PATCH v3] kbuild: Show marked Kconfig fragments in "help"

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Message-ID: <CAK7LNATENQQy6LrWS10S-EXsyAvTraSj2WA=O7rFsS9Ht6a+3g@mail.gmail.com>
Date:   Fri, 1 Sep 2023 16:58:37 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Nicolas Schier <nicolas@...sle.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3] kbuild: Show marked Kconfig fragments in "help"

On Fri, Sep 1, 2023 at 4:13 AM Kees Cook <keescook@...omium.org> wrote:
>
> Currently the Kconfig fragments in kernel/configs and arch/*/configs
> that aren't used internally aren't discoverable through "make help",
> which consists of hard-coded lists of config fragments. Instead, list
> all the fragment targets that have a "# Help: " comment prefix so the
> targets can be generated dynamically.
>
> Add logic to the Makefile to search for and display the fragment and
> comment. Add comments to fragments that are intended to be direct targets.
>
> Cc: Nicolas Schier <nicolas@...sle.eu>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: x86@...nel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-riscv@...ts.infradead.org
> Cc: linux-s390@...r.kernel.org
> Cc: linux-kbuild@...r.kernel.org
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Co-developed-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> v3:
> - Use Makefile logic from Masahiro Yamada
> - Use "# Help: " prefix, but only on desired fragment targets
> v2: https://lore.kernel.org/all/20230825194329.gonna.911-kees@kernel.org
> v1: https://lore.kernel.org/all/20230824223606.never.762-kees@kernel.org
> ---
>  Makefile                                   |  1 -
>  arch/arm/configs/dram_0x00000000.config    |  1 +
>  arch/arm/configs/dram_0xc0000000.config    |  1 +
>  arch/arm/configs/dram_0xd0000000.config    |  1 +
>  arch/arm/configs/lpae.config               |  1 +
>  arch/arm64/configs/virt.config             |  1 +
>  arch/powerpc/configs/disable-werror.config |  1 +
>  arch/powerpc/configs/security.config       |  4 +++-
>  arch/riscv/configs/32-bit.config           |  1 +
>  arch/riscv/configs/64-bit.config           |  1 +
>  arch/s390/configs/btf.config               |  1 +
>  arch/s390/configs/kasan.config             |  1 +
>  arch/x86/Makefile                          |  4 ----
>  kernel/configs/debug.config                |  2 ++
>  kernel/configs/kvm_guest.config            |  1 +
>  kernel/configs/nopm.config                 |  2 ++
>  kernel/configs/rust.config                 |  1 +
>  kernel/configs/tiny.config                 |  2 ++
>  kernel/configs/x86_debug.config            |  1 +
>  kernel/configs/xen.config                  |  2 ++
>  scripts/kconfig/Makefile                   | 15 ++++++++++++---
>  21 files changed, 36 insertions(+), 9 deletions(-)
>


Just one thing.





> diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config
> index 00009f7d0835..60a4b6d80b36 100644
> --- a/kernel/configs/tiny.config
> +++ b/kernel/configs/tiny.config
> @@ -1,3 +1,5 @@
> +# Help: Size-optimized kernel image


I will drop this.


We already have a hard-coded help message.

  tinyconfig   - Configure the tiniest possible kernel




Then, some lines below, again.

  tiny.config               - Size-optimized kernel image



tiny.config is for internal use for tinyconfig.




-- 
Best Regards
Masahiro Yamada