Added mce_log_p() predicate

For testing whether - say LL_DEBUG - logging is enabled before spending
cpu cycles for constructing parameters that mce_log() call might ignore
due to logging level settings.

mce-log.c

@@ -139,4 +139,20 @@ void mce_log_close(void)
 	if (logtype == MCE_LOG_SYSLOG)
 		closelog();
 }
+
+/**
+ * Log level testing predicate
+ *
+ * For testing whether given level of logging is allowed
+ * before spending cpu time for gathering parameters etc
+ *
+ * @param loglevel level of logging we might do
+ *
+ * @return 1 if logging at givel level is enabled, 0 if not
+ */
+int mce_log_p(const loglevel_t loglevel)
+{
+	return logverbosity >= loglevel;
+}
+
 #endif /* OSSOLOG_COMPILE */

mce-log.h

@@ -46,6 +46,7 @@ void mce_log_file(const loglevel_t loglevel, const char *const file,
 void mce_log_set_verbosity(const int verbosity);
 void mce_log_open(const char *const name, const int facility, const int type);
 void mce_log_close(void);
+int mce_log_p(const loglevel_t loglevel);
 #else
 /** Dummy version used when logging is disabled at compile time */
 #define mce_log(_loglevel, _fmt, ...)			do {} while (0)
@@ -55,6 +56,8 @@ void mce_log_close(void);
 #define mce_log_open(_name, _facility, _type)		do {} while (0)
 /** Dummy version used when logging is disabled at compile time */
 #define mce_log_close()					do {} while (0)
+/** Dummy version used when logging is disabled at compile time */
+#define mce_log_p(_loglevel)				0
 #endif /* OSSOLOG_COMPILE */
 
 #endif /* _MCE_LOG_H_ */