linux-kernel - [PATCH] docs: Document possible

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Message-ID: <20240203152208.1461293-1-gpiccoli@igalia.com>
Date: Sat,  3 Feb 2024 12:21:13 -0300
From: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To: linux-doc@...r.kernel.org,
	corbet@....net
Cc: linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org,
	rdunlap@...radead.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,
	"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH] docs: Document possible_cpus parameter

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>
---
 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
-- 
2.43.0