linux-kernel - Re: [PATCH] docs: Document possible

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Date: Sat, 3 Feb 2024 09:19:01 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: "Guilherme G. Piccoli" <gpiccoli@...lia.com>, linux-doc@...r.kernel.org,
 corbet@....net
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
 borntraeger@...ux.ibm.com, svens@...ux.ibm.com, kernel@...ccoli.net,
 kernel-dev@...lia.com, Changwoo Min <changwoo@...lia.com>
Subject: Re: [PATCH] docs: Document possible_cpus parameter



On 2/3/24 07:21, Guilherme G. Piccoli wrote:
> The number of possible CPUs is set be kernel in early boot time through
> some discovery mechanisms, like ACPI in x86. We have a parameter both
> in x86 and S390 to override that - there are some cases of BIOSes exposing
> more possible CPUs than the available ones, so this parameter is a good
> testing mechanism, but for some reason wasn't mentioned so far in the
> kernel parameters guide - let's fix that.
> 
> Cc: Changwoo Min <changwoo@...lia.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>

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

Thanks.

> ---
>  Documentation/admin-guide/kernel-parameters.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 31b3a25680d0..e553740190ea 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4644,6 +4644,11 @@
>  			may be specified.
>  			Format: <port>,<port>....
>  
> +	possible_cpus=  [SMP,S390,X86]
> +			Format: <unsigned int>
> +			Set the number of possible CPUs, overriding the
> +			regular discovery mechanisms (such as ACPI/FW, etc).
> +
>  	powersave=off	[PPC] This option disables power saving features.
>  			It specifically disables cpuidle and sets the
>  			platform machine description specific power_save

-- 
#Randy