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Diffstat (limited to 'doc/README.log')
| -rw-r--r-- | doc/README.log | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/README.log b/doc/README.log index 54d9a8e1b9..2abaee0c10 100644 --- a/doc/README.log +++ b/doc/README.log @@ -148,6 +148,14 @@ Also debug() and error() will generate log records - these use LOG_CATEGORY as the category, so you should #define this right at the top of the source file to ensure the category is correct. +You can also define CONFIG_LOG_ERROR_RETURN to enable the log_ret() macro. This +can be used whenever your function returns an error value: + + return log_ret(uclass_first_device(UCLASS_MMC, &dev)); + +This will write a log record when an error code is detected (a value < 0). This +can make it easier to trace errors that are generated deep in the call stack. + Code size --------- |