From 5879f1c94d67e05401cddd2043649548e38d65d3 Mon Sep 17 00:00:00 2001
From: Andrew Halaney <ahalaney@redhat.com>
Date: Wed, 13 Oct 2021 11:40:22 -0400
Subject: Documentation: dyndbg: Improve cli param examples
Jim pointed out that using $module.dyndbg= is always a more flexible
choice for using dynamic debug on the command line. The $module.dyndbg
style is checked at boot and handles if $module is a builtin. If it is
actually a loadable module, it is handled again later when the module is
loaded.
If you just use dyndbg="module $module +p" dynamic debug is only enabled
when $module is a builtin.
It was recommended to illustrate wildcard usage as well.
Suggested-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Link: https://lore.kernel.org/r/1634139622-20667-4-git-send-email-jbaron@akamai.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Documentation/admin-guide/dynamic-debug-howto.rst | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
(limited to 'Documentation/admin-guide/dynamic-debug-howto.rst')
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index d0911e7cc271..ae264aab42b6 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -357,7 +357,10 @@ Examples
Kernel command line: ...
// see whats going on in dyndbg=value processing
dynamic_debug.verbose=1
- // enable pr_debugs in 2 builtins, #cmt is stripped
- dyndbg="module params +p #cmt ; module sys +p"
+ // enable pr_debugs in the btrfs module (can be builtin or loadable)
+ btrfs.dyndbg="+p"
+ // enable pr_debugs in all files under init/
+ // and the function parse_one, #cmt is stripped
+ dyndbg="file init/* +p #cmt ; func parse_one +p"
// enable pr_debugs in 2 functions in a module loaded later
pc87360.dyndbg="func pc87360_init_device +p; func pc87360_find +p"
--
cgit