From 5879f1c94d67e05401cddd2043649548e38d65d3 Mon Sep 17 00:00:00 2001 From: Andrew Halaney Date: Wed, 13 Oct 2021 11:40:22 -0400 Subject: [PATCH] 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 Signed-off-by: Andrew Halaney Signed-off-by: Jason Baron Link: https://lore.kernel.org/r/1634139622-20667-4-git-send-email-jbaron@akamai.com Signed-off-by: Greg Kroah-Hartman --- 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 d0911e7..ae264aa 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