[PATCH] arm64: enable kernel command line concatenation

[Will Deacon]

On Thu, Aug 11, 2022 at 07:11:27PM -0400, George G. Davis wrote:
> From: "George G. Davis" <davis.george at siemens.com>
> 
> Enable CONFIG_CMDLINE to extend the boot loader supplied cmdline. This
> can then be used in config fragments to set command line arguments
> specific to testing of different kernel config options.
> 
> Signed-off-by: George G. Davis <davis.george at siemens.com>
> ---
>  arch/arm64/Kconfig | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 571cc234d0b3..cf4a44cde21b 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -2140,6 +2140,12 @@ 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.
> +

Please see cae118b6acc3 ("arm64: Drop support for CMDLINE_EXTEND") and the
Link tags in there for some background as to why we shouldn't just enable
this option.

Thanks,

Will