diff options
| author | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2022-07-12 09:39:49 +0200 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2022-07-26 02:30:56 -0600 |
| commit | 54e89a8beb0edc6135586fed2a71139830d94974 (patch) | |
| tree | e7633a4ca261ae30254057124c26870db3dc6563 /doc/develop/logging.rst | |
| parent | de84a4f0eed297afa752ee46c072a99834dde806 (diff) | |
log: force DEBUG when LOG_DEBUG is activated
When CONFIG_LOG is activated, if LOG_DEBUG is defined in a file and
DEBUG is not defined the trace with debug() macro are not displayed,
because the parameter cond : _DEBUG = 0 is checked in debug_cond().
With this patch the define DEBUG, used to force the trace generated by
debug() macro, is linked with the define LOG_DEBUG, used to force the
trace generated by other macros (log_debug, dev_dbg, pr_debug).
We only need to define LOG_DEBUG in a file to activate all the
traces generated by any U-Boot debug macro, as it is described in
/doc/develop/logging.rst
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Diffstat (limited to 'doc/develop/logging.rst')
| -rw-r--r-- | doc/develop/logging.rst | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/doc/develop/logging.rst b/doc/develop/logging.rst index 51095b05ba..704a6bf1d8 100644 --- a/doc/develop/logging.rst +++ b/doc/develop/logging.rst @@ -66,26 +66,21 @@ Sometimes it is useful to turn on logging just in one file. You can use this #define LOG_DEBUG to enable building in of all logging statements in a single file. Put it at -the top of the file, before any #includes. - -To actually get U-Boot to output this you need to also set the default logging -level - e.g. set CONFIG_LOG_DEFAULT_LEVEL to 7 (:c:data:`LOGL_DEBUG`) or more. -Otherwise debug output is suppressed and will not be generated. +the top of the file, before any #includes and any message in the file will be +written, regardless of the value of CONFIG_LOG_DEFAULT_LEVEL. Using DEBUG ----------- U-Boot has traditionally used a #define called DEBUG to enable debugging on a -file-by-file basis. The debug() macro compiles to a printf() statement if -DEBUG is enabled, and an empty statement if not. +file-by-file basis but LOG_DEBUG are intended to replace it with the logging +facilities; DEBUG is activated when LOG_DEBUG is activated. With logging enabled, debug() statements are interpreted as logging output -with a level of LOGL_DEBUG and a category of LOGC_NONE. +with a level of LOGL_DEBUG and a category of LOG_CATEGORY. -The logging facilities are intended to replace DEBUG, but if DEBUG is defined -at the top of a file, then it takes precedence. This means that debug() -statements will result in output to the console and this output will not be -logged. +With logging disabled, the debug() macro compiles to a printf() statement +if DEBUG is enabled and to an empty statement if not. Logging statements ------------------ |