diff options
Diffstat (limited to 'Documentation/admin-guide/dynamic-debug-howto.rst')
| -rw-r--r-- | Documentation/admin-guide/dynamic-debug-howto.rst | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst index b119b8277b3e..a89cfa083155 100644 --- a/Documentation/admin-guide/dynamic-debug-howto.rst +++ b/Documentation/admin-guide/dynamic-debug-howto.rst @@ -249,8 +249,7 @@ Debug messages during Boot Process To activate debug messages for core code and built-in modules during the boot process, even before userspace and debugfs exists, use -``dyndbg="QUERY"``, ``module.dyndbg="QUERY"``, or ``ddebug_query="QUERY"`` -(``ddebug_query`` is obsoleted by ``dyndbg``, and deprecated). QUERY follows +``dyndbg="QUERY"`` or ``module.dyndbg="QUERY"``. QUERY follows the syntax described above, but must not exceed 1023 characters. Your bootloader may impose lower limits. @@ -270,8 +269,7 @@ this boot parameter for debugging purposes. If ``foo`` module is not built-in, ``foo.dyndbg`` will still be processed at boot time, without effect, but will be reprocessed when module is -loaded later. ``ddebug_query=`` and bare ``dyndbg=`` are only processed at -boot. +loaded later. Bare ``dyndbg=`` is only processed at boot. Debug Messages at Module Initialization Time @@ -358,8 +356,11 @@ Examples // boot-args example, with newlines and comments for readability 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" + dynamic_debug.verbose=3 + // 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" |