From 9784f29bf59b2fe7a968be9394afb39a25ac0114 Mon Sep 17 00:00:00 2001
From: Daniel Lublin <daniel@lublin.se>
Date: Tue, 9 Jul 2024 15:51:57 +0200
Subject: [PATCH] Documentation: add reference from dynamic debug to loglevel
kernel params
This is useful information for somebody who has managed to dig into
enabling debug output, but is wondering why there is no such output
appearing on the console.
Signed-off-by: Daniel Lublin <daniel@lublin.se>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/4633bdb82c1c7c014d79840887878624a55c59f8.1720533043.git.daniel@lublin.se
---
Documentation/admin-guide/dynamic-debug-howto.rst | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 0e9b48daf6902..7c036590cd07c 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -26,6 +26,11 @@ Dynamic debug provides:
- format string
- class name (as known/declared by each module)
+NOTE: To actually get the debug-print output on the console, you may
+need to adjust the kernel ``loglevel=``, or use ``ignore_loglevel``.
+Read about these kernel parameters in
+Documentation/admin-guide/kernel-parameters.rst.
+
Viewing Dynamic Debug Behaviour
===============================
--
GitLab