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From:   Rob Herring <robh@kernel.org>
Date:   Fri, 26 Mar 2021 09:26:47 -0600
Message-ID: <CAL_JsqK2TT=j1QjiRgTYQvwHqivE-3HgYo2JzxTJSWO2wvK69Q@mail.gmail.com>
Subject: Re: [PATCH v3 11/17] riscv: Convert to GENERIC_CMDLINE
To:     Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     Andreas Schwab <schwab@linux-m68k.org>,
        Will Deacon <will@kernel.org>,
        Daniel Walker <danielwa@cisco.com>,
        Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
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On Fri, Mar 26, 2021 at 8:20 AM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
>
>
>
> Le 26/03/2021 =C3=A0 15:08, Andreas Schwab a =C3=A9crit :
> > On M=C3=A4r 26 2021, Christophe Leroy wrote:
> >
> >> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> >> index f8f15332caa2..e7c91ee478d1 100644
> >> --- a/arch/riscv/kernel/setup.c
> >> +++ b/arch/riscv/kernel/setup.c
> >> @@ -20,6 +20,7 @@
> >>   #include <linux/swiotlb.h>
> >>   #include <linux/smp.h>
> >>   #include <linux/efi.h>
> >> +#include <linux/cmdline.h>
> >>
> >>   #include <asm/cpu_ops.h>
> >>   #include <asm/early_ioremap.h>
> >> @@ -228,10 +229,8 @@ static void __init parse_dtb(void)
> >>      }
> >>
> >>      pr_err("No DTB passed to the kernel\n");
> >> -#ifdef CONFIG_CMDLINE_FORCE
> >> -    strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> >> +    cmdline_build(boot_command_line, NULL, COMMAND_LINE_SIZE);
> >>      pr_info("Forcing kernel command line to: %s\n", boot_command_line=
);
> >
> > Shouldn't that message become conditional in some way?
> >
>
> You are right, I did something similar on ARM but looks like I missed it =
on RISCV.

How is this hunk even useful? Under what conditions can you boot
without a DTB? Even with a built-in DTB, the DT cmdline handling would
be called.

Rob