[tip:sched/core] x86/tsc: Append the 'tsc=' description for the 'tsc=unstable' boot parameter

[tip-bot for Dou Liyang]

Commit-ID:  6be53520ad8f87dc748f381e4e8e6a846a4b466b
Gitweb:     https://git.kernel.org/tip/6be53520ad8f87dc748f381e4e8e6a846a4b466b
Author:     Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
AuthorDate: Mon, 9 Oct 2017 17:03:33 +0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 10 Oct 2017 11:45:42 +0200

x86/tsc: Append the 'tsc=' description for the 'tsc=unstable' boot parameter

Commit:

  8309f86cd41e ("x86/tsc: Provide 'tsc=unstable' boot parameter")

added a new 'tsc=unstable' parameter, but didn't document it.

Document it.

Signed-off-by: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: <corbet@xxxxxxx>
Cc: <pasha.tatashin@xxxxxxxxxx>
Cc: <tglx@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1507539813-11420-1-git-send-email-douly.fnst@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 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 0549662..6b99c8b 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4194,6 +4194,9 @@
 			Used to run time disable IRQ_TIME_ACCOUNTING on any
 			platforms where RDTSC is slow and this accounting
 			can add overhead.
+			[x86] unstable: mark the TSC clocksource as unstable, this
+			marks the TSC unconditionally unstable at bootup and
+			avoids any further wobbles once the TSC watchdog notices.
 
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