linux-kernel - Re: [PATCH v3 11/17] riscv: Convert to GENERIC

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Date:   Tue, 30 Mar 2021 03:52:17 +0300
From:   Nick Kossifidis <mick@....forth.gr>
To:     Rob Herring <robh@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Andreas Schwab <schwab@...ux-m68k.org>,
        Will Deacon <will@...nel.org>,
        Daniel Walker <danielwa@...co.com>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>, devicetree@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-kernel@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        microblaze <monstr@...str.eu>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        nios2 <ley.foon.tan@...el.com>,
        Openrisc <openrisc@...ts.librecores.org>,
        linux-hexagon@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        X86 ML <x86@...nel.org>, linux-xtensa@...ux-xtensa.org,
        SH-Linux <linux-sh@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>, paul.walmsley@...ive.com
Subject: Re: [PATCH v3 11/17] riscv: Convert to GENERIC_CMDLINE

Στις 2021-03-26 17:26, Rob Herring έγραψε:
> On Fri, Mar 26, 2021 at 8:20 AM Christophe Leroy
> <christophe.leroy@...roup.eu> wrote:
>> 
>> 
>> 
>> Le 26/03/2021 à 15:08, Andreas Schwab a écrit :
>> > On Mär 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
> 

cced Paul who introduced this:
https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/arch/riscv/kernel/setup.c?id=8fd6e05c7463b635e51ec7df0a1858c1b5a6e350