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Message-ID: <f4bce256-d3c4-4d67-b4fb-69619fdbd2fe@infradead.org>
Date: Sat, 3 Feb 2024 09:19:01 -0800
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Subject: Re: [PATCH] docs: Document possible_cpus parameter
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To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>, linux-doc@vger.kernel.org,
 corbet@lwn.net
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
 tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
 dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
 hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com,
 borntraeger@linux.ibm.com, svens@linux.ibm.com, kernel@gpiccoli.net,
 kernel-dev@igalia.com, Changwoo Min <changwoo@igalia.com>
References: <20240203152208.1461293-1-gpiccoli@igalia.com>
From: Randy Dunlap <rdunlap@infradead.org>
In-Reply-To: <20240203152208.1461293-1-gpiccoli@igalia.com>
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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@igalia.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

Reviewed-by: Randy Dunlap <rdunlap@infradead.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