linux-kernel - [PATCH v3 3/3] Documentation: dyndbg: Improve cli param examples

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Date:   Wed, 13 Oct 2021 11:40:22 -0400
From:   Jason Baron <jbaron@...mai.com>
To:     gregkh@...uxfoundation.org
Cc:     ahalaney@...hat.com, jim.cromie@...il.com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/3] Documentation: dyndbg: Improve cli param examples

From: Andrew Halaney <ahalaney@...hat.com>

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.

Signed-off-by: Andrew Halaney <ahalaney@...hat.com>
Suggested-by: Jim Cromie <jim.cromie@...il.com>
Signed-off-by: Jason Baron <jbaron@...mai.com>
---
 Documentation/admin-guide/dynamic-debug-howto.rst | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

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"
-- 
2.7.4