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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 10 Oct 2017 04:02:42 -0700
From:   tip-bot for Dou Liyang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     efault@....de, pasha.tatashin@...cle.com, peterz@...radead.org,
        torvalds@...ux-foundation.org, tglx@...utronix.de, corbet@....net,
        linux-kernel@...r.kernel.org, hpa@...or.com,
        douly.fnst@...fujitsu.com, mingo@...nel.org
Subject: [tip:sched/core] x86/tsc: Append the 'tsc=' description for the
 'tsc=unstable' boot parameter

Commit-ID:  6be53520ad8f87dc748f381e4e8e6a846a4b466b
Gitweb:     https://git.kernel.org/tip/6be53520ad8f87dc748f381e4e8e6a846a4b466b
Author:     Dou Liyang <douly.fnst@...fujitsu.com>
AuthorDate: Mon, 9 Oct 2017 17:03:33 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
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@...fujitsu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: <corbet@....net>
Cc: <pasha.tatashin@...cle.com>
Cc: <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1507539813-11420-1-git-send-email-douly.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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.
 
 	turbografx.map[2|3]=	[HW,JOY]
 			TurboGraFX parallel port interface