linux-kernel - Re: [PATCH v2] printk: Document that CONFIG_BOOT_PRINTK_DELAY required for boot

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Message-ID: <641836b3-2378-c728-696a-03a42ab11bc8@infradead.org>
Date:   Thu, 26 Jan 2023 17:12:10 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Jonathan Corbet <corbet@....net>
Cc:     Matthew Wilcox <willy@...radead.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2] printk: Document that CONFIG_BOOT_PRINTK_DELAY
 required for boot_delay=



On 1/26/23 14:54, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> Document the fact that CONFIG_BOOT_PRINTK_DELAY must be enabled for the
> "boot_delay" kernel parameter to work.  Also mention that "lpj=" may be
> necessary.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Reviewed-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
> Changes from v1 (https://lore.kernel.org/all/20230123180440.901793-1-helgaas@kernel.org/):
> - Clarify use of "lpj=".  Reword consequences of delay larger than 10000.
> 
>  Documentation/admin-guide/kernel-parameters.txt | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 6cfa6e3996cf..814e58487239 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -480,8 +480,10 @@
>  			See Documentation/block/cmdline-partition.rst
>  
>  	boot_delay=	Milliseconds to delay each printk during boot.
> -			Values larger than 10 seconds (10000) are changed to
> -			no delay (0).
> +			Only works if CONFIG_BOOT_PRINTK_DELAY is enabled,
> +			and you may also have to specify "lpj=".  Boot_delay
> +			values larger than 10 seconds (10000) are assumed
> +			erroneous and ignored.
>  			Format: integer
>  
>  	bootconfig	[KNL]

-- 
~Randy