linux-kernel - Re: [PATCH 1/9] mips: drop selecting the non-existing config SYS_HAS_EARLY_PRINTK

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Message-ID: <CAKXUXMxQ_rCt0CQxKm7ym44vuMTT1cgnzSCdZZQN--DPwayG6Q@mail.gmail.com>
Date:   Tue, 14 Dec 2021 13:25:26 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Sander Vanheule <sander@...nheule.net>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        Bert Vermeulen <bert@...t.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Daniel Silsby <dansilsby@...il.com>,
        Paul Cercueil <paul@...pouillou.net>
Subject: Re: [PATCH 1/9] mips: drop selecting the non-existing config SYS_HAS_EARLY_PRINTK_8250

On Mon, Dec 13, 2021 at 7:52 PM Sander Vanheule <sander@...nheule.net> wrote:
>
> Hi Lukas,
>
> Thanks for the patch!
>
> On Mon, 2021-12-13 at 12:16 +0100, Lukas Bulwahn wrote:
> > Commit 4042147a0cc6 ("MIPS: Add Realtek RTL838x/RTL839x support as generic
> > MIPS system") introduces config MACH_REALTEK_RTL, which selects the
> > non-existing config SYS_HAS_EARLY_PRINTK_8250.
> >
> > As the MACH_REALTEK_RTL config also selects SYS_HAS_EARLY_PRINTK and
> > USE_GENERIC_EARLY_PRINTK_8250, an early printk with 8250 should be covered.
> > Probably SYS_HAS_EARLY_PRINTK_8250 is just some left-over from an early
> > draft version of this commit.
> >
> > Drop selecting the non-existing config SYS_HAS_EARLY_PRINTK_8250.
> >
> > Fixes: 4042147a0cc6 ("MIPS: Add Realtek RTL838x/RTL839x support as generic MIPS system")
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> > ---
> >  arch/mips/Kconfig | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> > index 00951bfdbab0..c89ce68d9580 100644
> > --- a/arch/mips/Kconfig
> > +++ b/arch/mips/Kconfig
> > @@ -640,7 +640,6 @@ config MACH_REALTEK_RTL
> >         select SYS_SUPPORTS_MULTITHREADING
> >         select SYS_SUPPORTS_VPE_LOADER
> >         select SYS_HAS_EARLY_PRINTK
> > -       select SYS_HAS_EARLY_PRINTK_8250
> >         select USE_GENERIC_EARLY_PRINTK_8250
> >         select BOOT_RAW
> >         select PINCTRL
>
> MACH_REALTEK_RTL doesn't actually call setup_8250_early_printk_port(). That means
> USE_GENERIC_EARLY_PRINTK_8250 is also not needed. Being MIPS_GENERIC, that additionaly
> means SYS_HAS_EARLY_PRINTK doesn't need to be selected.
>
> I only recently found the MIPS_GENERIC "early" console therefore doesn't actually work,
> but we use the "ns16550a" earlycon console instead. So feel free to also drop the other
> two other EARLY_PRINTK symbols, if you think this is in-scope for this patch. Otherwise I
> can submit a separate patch later.
>
> In any case:
> Acked-by: Sander Vanheule <sander@...nheule.net>
>

I am fine either way. Thomas, also feel free to just drop this patch
in the series and take the full clean-up patch from Sander.

Lukas