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log: Allow #define LOG_DEBUG to enable logging in a file 

At present it is possible to '#define DEBUG' at the top of a file which
causes all debug() statements in that file to become active. There is
currently no equivalent with logging, but this is a useful function.

Add a LOG_DEBUG define along with documentation.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-02-16 20:24:37 -07:00 committed by Bin Meng
parent 8dee7b96fd
commit f9811e8575
2 changed files with 21 additions and 1 deletions
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15
doc/README.log
View File

@ -69,6 +69,21 @@ If CONFIG_LOG is not set, then no logging will be available.
The above have SPL versions also, e.g. CONFIG_SPL_MAX_LOG_LEVEL.
Temporary logging within a single file
--------------------------------------
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 (LOGL_DEBUG) or more. Otherwise
debug output is suppressed and will not be generated.
Convenience functions
---------------------

7
include/log.h
View File

@ -111,11 +111,16 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
#endif
#if CONFIG_IS_ENABLED(LOG)
#ifdef LOG_DEBUG
#define _LOG_DEBUG 1
#else
#define _LOG_DEBUG 0
#endif
/* Emit a log record if the level is less that the maximum */
#define log(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
if (CONFIG_IS_ENABLED(LOG) && _l <= _LOG_MAX_LEVEL) \
if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL || _LOG_DEBUG)) \
_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, \
pr_fmt(_fmt), ##_args); \