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

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Date:   Wed, 28 Sep 2022 08:48:08 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        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 Tue, Sep 27, 2022 at 10:19 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Tue, Sep 27, 2022, at 3:31 PM, Geert Uytterhoeven wrote:
> > On Thu, Aug 18, 2022 at 4:56 PM Arnd Bergmann <arnd@...nel.org> wrote:
> >> --- 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?
>
> That would also be possible, but I prefer to keep limiting only
> the DEBUG_UNCOMPRESS. The idea of DEBUG_LL is that while it's
> hardwired to a particular hardware address, it does not actually
> access this address unless you specify the 'earlyprintk'
> argument on the command line.

... or unless something goes really wrong, and the kernel tries to
inform the user using early_print()?

Note that the I/O region for the debug serial port is mapped regardless.
Any chance this can cause conflicts?

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