linux-kernel - [PATCH] doc: Clarify that nmi_watchdog param is for hardlockups

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Date:	Sat, 10 Oct 2015 15:40:42 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Jonathan Corbet <corbet@....net>,
	linux-doc@...r.kernel.org (open list:DOCUMENTATION),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] doc: Clarify that nmi_watchdog param is for hardlockups

The kernel NMI watchdog acts as both a hardlockup and softlockup detector.
However, the kernel parameter nmi_watchdog can only enable or disable the
hardlockup detector. Clarify that in the documentation.

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 Documentation/kernel-parameters.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6fecc72..5b83279 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2329,11 +2329,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	nmi_watchdog=	[KNL,BUGS=X86] Debugging features for SMP kernels
 			Format: [panic,][nopanic,][num]
 			Valid num: 0 or 1
-			0 - turn nmi_watchdog off
-			1 - turn nmi_watchdog on
+			0 - turn hardlockup detector in nmi_watchdog off
+			1 - turn hardlockup detector in nmi_watchdog on
 			When panic is specified, panic when an NMI watchdog
 			timeout occurs (or 'nopanic' to override the opposite
-			default).
+			default). To disable both hard and soft lockup detectors,
+			please see 'nowatchdog'.
 			This is useful when you use a panic=... timeout and
 			need the box quickly up again.
 
-- 
2.6.0

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