linux-kernel - [PATCH] x86/tsc: Append description for 'tsc=unstable' boot parameter

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Date:   Mon, 9 Oct 2017 17:03:33 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <corbet@....net>, <tglx@...utronix.de>, <mingo@...nel.org>,
        <peterz@...radead.org>, <pasha.tatashin@...cle.com>,
        <x86@...nel.org>, Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [PATCH] x86/tsc: Append description for 'tsc=unstable' boot parameter

Commit 8309f86cd41e ("x86/tsc: Provide 'tsc=unstable' boot parameter") adds
a new parameter 'tsc=unstable', but doesn't add some description to guide
users.

Append the description of 'tsc=unstable' at the end of 'tsc=' section.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9a84483..33e83b6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4196,6 +4196,9 @@
 			Used to run time disable IRQ_TIME_ACCOUNTING on any
 			platforms where RDTSC is slow and this accounting
 			can add overhead.
+			[x86] unstable: mark tsc clocksource as unstable, this
+			marks the TSC unconditionally unstable at bootup and
+			avoids any further wobbles once the TSC watchdog notices.
 
 	turbografx.map[2|3]=	[HW,JOY]
 			TurboGraFX parallel port interface
-- 
2.5.5