linux-kernel - Re: [PATCH 5/5] ARM: make ARCH

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Date:   Tue, 27 Sep 2022 15:31:24 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>, Sekhar Nori <nsekhar@...com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 5/5] ARM: make ARCH_MULTIPLATFORM user-visible

Hi Arnd,

On Thu, Aug 18, 2022 at 4:56 PM Arnd Bergmann <arnd@...nel.org> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> Some options like CONFIG_DEBUG_UNCOMPRESS and CONFIG_CMDLINE_FORCE are
> fundamentally incompatible with portable kernels but are currently allowed
> in all configurations. Other options like XIP_KERNEL are essentially
> useless after the completion of the multiplatform conversion.
>
> Repurpose the existing CONFIG_ARCH_MULTIPLATFORM option to decide
> whether the resulting kernel image is meant to be portable or not,
> and using this to guard all of the known incompatible options.
>
> This is similar to how the RISC-V kernel handles the CONFIG_NONPORTABLE
> option (with the opposite polarity).
>
> A few references to CONFIG_ARCH_MULTIPLATFORM were left behind by
> earlier clanups and have to be removed now up.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for your patch!

> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -1904,6 +1904,7 @@ config DEBUG_UART_8250_PALMCHIP
>
>  config DEBUG_UNCOMPRESS
>         bool "Enable decompressor debugging via DEBUG_LL output"
> +       depends on !ARCH_MULTIPLATFORM

Shouldn't DEBUG_LL itself depend on !ARCH_MULTIPLATFORM instead?

>         depends on !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
>         depends on DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
>                      (!DEBUG_TEGRA_UART || !ZBOOT_ROM) && \

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds