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-rw-r--r--lib/Kconfig.debug17
1 files changed, 11 insertions, 6 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6777153f18f3..ef8192bc0c33 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1205,8 +1205,13 @@ config DYNAMIC_DEBUG
otherwise be available at runtime. These messages can then be
enabled/disabled based on various levels of scope - per source file,
function, module, format string, and line number. This mechanism
- implicitly enables all pr_debug() and dev_dbg() calls. The impact of
- this compile option is a larger kernel text size of about 2%.
+ implicitly compiles in all pr_debug() and dev_dbg() calls, which
+ enlarges the kernel text size by about 2%.
+
+ If a source file is compiled with DEBUG flag set, any
+ pr_debug() calls in it are enabled by default, but can be
+ disabled at runtime as below. Note that DEBUG flag is
+ turned on by many CONFIG_*DEBUG* options.
Usage:
@@ -1223,16 +1228,16 @@ config DYNAMIC_DEBUG
lineno : line number of the debug statement
module : module that contains the debug statement
function : function that contains the debug statement
- flags : 'p' means the line is turned 'on' for printing
+ flags : '=p' means the line is turned 'on' for printing
format : the format used for the debug statement
From a live system:
nullarbor:~ # cat <debugfs>/dynamic_debug/control
# filename:lineno [module]function flags format
- fs/aio.c:222 [aio]__put_ioctx - "__put_ioctx:\040freeing\040%p\012"
- fs/aio.c:248 [aio]ioctx_alloc - "ENOMEM:\040nr_events\040too\040high\012"
- fs/aio.c:1770 [aio]sys_io_cancel - "calling\040cancel\012"
+ fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
+ fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
+ fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
Example usage:

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