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Documentation: dyndbg: Improve cli param examples

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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>
This commit is contained in:
Andrew Halaney 2021-10-13 11:40:22 -04:00 committed by Greg Kroah-Hartman
parent 9c40e1aa84
commit 5879f1c94d
1 changed files with 5 additions and 2 deletions
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7
Documentation/admin-guide/dynamic-debug-howto.rst
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@ -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"