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authorAndrew Halaney <ahalaney@redhat.com>2021-10-13 11:40:22 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-10-14 10:48:56 +0200
commit5879f1c94d67e05401cddd2043649548e38d65d3 (patch)
treeace482f96a2f2f3e9a7e0cbbe09204cda8cf61af /Documentation/admin-guide
parent9c40e1aa84123750773a57c9cf39112459a952dd (diff)
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>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/dynamic-debug-howto.rst7
1 files 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"