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| author | Andrew Halaney <ahalaney@redhat.com> | 2021-10-13 11:40:22 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-14 10:48:56 +0200 |
| commit | 5879f1c94d67e05401cddd2043649548e38d65d3 (patch) | |
| tree | ace482f96a2f2f3e9a7e0cbbe09204cda8cf61af /Documentation/admin-guide/dynamic-debug-howto.rst | |
| parent | 9c40e1aa84123750773a57c9cf39112459a952dd (diff) | |
| download | linux-5879f1c94d67e05401cddd2043649548e38d65d3.tar.bz2 | |
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/dynamic-debug-howto.rst')
| -rw-r--r-- | Documentation/admin-guide/dynamic-debug-howto.rst | 7 |
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" |