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

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Date:   Sun, 9 Jul 2023 23:30:56 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Dong Zhihong <donmor3000@...mail.com>
Cc:     kernel@...0n.name, ardb@...nel.org, tangyouling@...ngson.cn,
        zhoubinbin@...ngson.cn, yangtiezhu@...ngson.cn, tglx@...utronix.de,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] loongarch: Make CONFIG_CMDLINE work with
 CONFIG_CMDLINE_EXTEND and CONFIG_CMDLINE_BOOTLOADER

On Sun, Jul 9, 2023 at 9:33 PM Dong Zhihong <donmor3000@...mail.com> wrote:
>
> This patch tends to fix broken CONFIG_CMDLINE, which is not working with
> CONFIG_CMDLINE_EXTEND or CONFIG_CMDLINE_BOOTLOADER. Some code is absent in
> arch/loongarch/kernel/setup.c, which should handle built-in command lines
> in CONFIG_CMDLINE. The absence of such code causes CONFIG_CMDLINE not
> working if CONFIG_CMDLINE_EXTEND or CONFIG_CMDLINE_BOOTLOADER is set to Y.
> CONFIG_CMDLINE_FORCE is not affected.
How to reproduce? If you use UEFI firmware, this is handled in
drivers/firmware/efi/libstub/efi-stub.c; if you use non-UEFI firmware,
this is handled in drivers/of/fdt.c.

Huacai
>
> Signed-off-by: Dong Zhihong <donmor3000@...mail.com>
> ---
>  arch/loongarch/kernel/setup.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
> index 78a00359bde3..504218b94879 100644
> --- a/arch/loongarch/kernel/setup.c
> +++ b/arch/loongarch/kernel/setup.c
> @@ -335,6 +335,22 @@ static void __init bootcmdline_init(char **cmdline_p)
>         }
>  #endif
>
> +#ifdef CONFIG_CMDLINE
> +       /*
> +        * If CONFIG_CMDLINE_BOOTLOADER is enabled then we use thei built-in
> +        * command line if no command line given, or we append given command
> +        * line to the built-in one if CONFIG_CMDLINE_EXTEND is enabled.
> +        */
> +       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);
> +       }
> +
> +       if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
> +               strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> +#endif
> +
>  out:
>         *cmdline_p = boot_command_line;
>  }
> --
> 2.25.1
>
>