[PATCH] arm64: Kconfig: add CONFIG_CMDLINE_EXTEND

[Will Deacon]

On Tue, Nov 03, 2026 at 09:41:40AM +0100, Paul Cercueil wrote:
> Other archs have it, and it is supported in arch-independent code, so I
> see no reason why it is not provided on Aarch64. Add it there.
> 
> Signed-off-by: Paul Cercueil <paul.cercueil at bootlin.com>
> ---
>  arch/arm64/Kconfig | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 1075bc661833..f8542e532b50 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -2551,6 +2551,12 @@ config CMDLINE_FROM_BOOTLOADER
>  	  the boot loader doesn't provide any, the default kernel command
>  	  string provided in CMDLINE will be used.
>  
> +config CMDLINE_EXTEND
> +	bool "Extend bootloader kernel arguments"
> +	help
> +	  The command-line arguments provided by the boot loader will be
> +	  appended to the default kernel command string.

We previously reverted this in cae118b6acc3 ("arm64: Drop support for
CMDLINE_EXTEND") and I think that reasoning still applies. The thing
that _has_ changed since then, is that I think bootconfig now has some
support for early params, so that's really what people should be using
here.

Will