linux-kernel - [PATCH v2 6/8] docs: document panic fully in sysctl/kernel.rst

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Message-Id: <20200218125923.685-7-steve@sk2.org>
Date:   Tue, 18 Feb 2020 13:59:21 +0100
From:   Stephen Kitt <steve@....org>
To:     Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-doc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Stephen Kitt <steve@....org>
Subject: [PATCH v2 6/8] docs: document panic fully in sysctl/kernel.rst

The description of panic doesn’t cover all the supported scenarios;
this patch fixes that, describing the three possibilities (no reboot,
immediate reboot, reboot after a delay).

Based on the implementation in kernel/panic.c.

Signed-off-by: Stephen Kitt <steve@....org>
---
 Documentation/admin-guide/sysctl/kernel.rst | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 795d8e695f50..a67c218c4066 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -558,9 +558,15 @@ The default is 65534.
 panic
 =====
 
-The value in this file represents the number of seconds the kernel
-waits before rebooting on a panic. When you use the software watchdog,
-the recommended setting is 60.
+The value in this file determines the behaviour of the kernel on a
+panic:
+
+* if zero, the kernel will loop forever;
+* if negative, the kernel will reboot immediately;
+* if positive, the kernel will reboot after the corresponding number
+  of seconds.
+
+When you use the software watchdog, the recommended setting is 60.
 
 
 panic_on_io_nmi
-- 
2.20.1