[PATCH v3 6/6] Documentation/kernel-parameters: add/update printk_delay/boot_delay

[Steven Rostedt]

On Sun, 12 Jul 2026 11:20:37 +0100
Andrew Murray <amurray at thegoodpenguin.co.uk> wrote:

> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 2884103b93bca7b76cd3a93946276074cf62d0a1..1118feda87b1b04543b1da0bd52c090b1fddaeac 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -650,11 +650,19 @@ Kernel parameters
>  			See Documentation/block/cmdline-partition.rst
>  
>  	boot_delay=	[KNL,EARLY]
> -			Milliseconds to delay each printk during boot.
> -			Only works if GENERIC_CALIBRATE_DELAY is enabled,
> -			and you may also have to specify "lpj=".  Boot_delay
> -			values larger than 10 seconds (10000) are assumed
> -			erroneous and ignored.
> +			Milliseconds to delay each printk during and post boot.
> +			Boot time delays only work if GENERIC_CALIBRATE_DELAY
> +			is enabled.
> +
> +			Once booted the delay can be removed or adjusted via
> +			the printk_delay sysctl.
> +
> +			Please note that you may also have to specify "lpj=".
> +			Boot_delay values larger than 10 seconds (10000) are
> +			assumed erroneous and ignored.
> +
> +			This will soon be deprecated, please use printk_delay
> +			instead.
>  			Format: integer
>  
>  	bootconfig	[KNL,EARLY]
> @@ -5468,6 +5476,19 @@ Kernel parameters
>  	printk.time=	Show timing data prefixed to each printk message line
>  			Format: <bool>  (1/Y/y=enable, 0/N/n=disable)
>  
> +	printk_delay=	[KNL,EARLY]
> +			Milliseconds to delay each printk during and post boot.
> +			Boot time delays only work if GENERIC_CALIBRATE_DELAY
> +			is enabled.
> +
> +			Once booted the delay can be removed or adjusted via
> +			the printk_delay sysctl.
> +
> +			Please note that you may also have to specify "lpj=".
> +			printk_delay values larger than 10 seconds (10000) are
> +			assumed erroneous and ignored.
> +			Format: integer
> +

The two parameters descriptions are identical. They should show something
different. Is it just that the "boot_delay" name is getting deprecated?

-- Steve