linux-kernel - Re: [PATCH] Documentation: update kernel parameter limit notes

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Message-ID: <670212bf-469c-c25c-7eea-bb14f74e3ac0@infradead.org>
Date:   Tue, 21 Feb 2023 15:05:15 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     James Addison <jay@...hosting.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: update kernel parameter limit notes

Hi,

On 2/21/23 10:34, James Addison wrote:
> There does appear to be a limit on the number of parameters accepted by the
> kernel at boot-time, so this changeset updates the kernel-parameters.rst
> documentation to reflect that.
> 
> Signed-off-by: James Addison <jay@...hosting.net>
> ---
>  Documentation/admin-guide/kernel-parameters.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.rst
> b/Documentation/admin-guide/kernel-parameters.rst
> index 959f73a32..12cbf46b6 100644
> --- a/Documentation/admin-guide/kernel-parameters.rst
> +++ b/Documentation/admin-guide/kernel-parameters.rst
> @@ -204,7 +204,8 @@ be entered as an environment variable, whereas its
> absence indicates that
>  it will appear as a kernel argument readable via /proc/cmdline by programs
>  running once the system is up.
> 
> -The number of kernel parameters is not limited, but the length of the
> +The number of kernel parameters is limited to 32 by default (128 in User Mode
> +Linux), and is defined in ./init/main.c as MAX_INIT_ARGS. The length of the
>  complete command line (parameters including spaces etc.) is limited to
>  a fixed number of characters. This limit depends on the architecture
>  and is between 256 and 4096 characters. It is defined in the file

I agree with your patch, but you will need to Cc: some maintainer on
your (next) email/patch so that they can apply/merge it (if they want to).

Thanks.
-- 
~Randy