linux-kernel - Re: [PATCH v3] LoongArch: Make CONFIG_CMDLINE work with CONFIG_CMDLINE_EXTEND and CONFIG_CMDLINE

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Date:   Wed, 12 Jul 2023 09:19:28 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     donmor <donmor3000@...mail.com>
Cc:     "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>,
        "kernel@...0n.name" <kernel@...0n.name>,
        "yangtiezhu@...ngson.cn" <yangtiezhu@...ngson.cn>,
        "zhoubinbin@...ngson.cn" <zhoubinbin@...ngson.cn>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "tangyouling@...ngson.cn" <tangyouling@...ngson.cn>
Subject: Re: [PATCH v3] LoongArch: Make CONFIG_CMDLINE work with
 CONFIG_CMDLINE_EXTEND and CONFIG_CMDLINE_BOOTLOADER

On Tue, Jul 11, 2023 at 11:27 PM ‎ donmor <donmor3000@...mail.com> wrote:
>
> 在 2023-07-11星期二的 22:26 +0800，Huacai Chen写道：
>
> ...
> > +       if (IS_ENABLED(CONFIG_CMDLINE_EXTEND)) {
> > > +               strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> > > +               strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
> > > +               strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
> > You can simply the logic:
> >                strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
> >                strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> > And then modify the comments because you are appending built-in parts
> > to bootloader parts.
> >
> I think the command line retrieved from bootloader should be placed after the
> built-in one so that it can override params in the latter.
config CMDLINE_EXTEND
        bool "Use built-in to extend bootloader kernel arguments"

The fdt version also uses this logic, but you are using bootloader
parts to extend built-in parts.

>
> > >         }
> > > +
> > > +       if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
> > > +               strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> > This should be removed if you want to keep the exact meaning of
> > CONFIG_CMDLINE_BOOTLOADER.
> >
> > Huacai
> >
> Do you mean 'IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && ' is not necessary? And I
> think the rest of this part should be here, because CONFIG_CMDLINE_BOOTLOADER
> won't append anything to boot_command_line unless it is empty, according to its
> description.

OK, you are right here.

Huacai