diff -r d28360ee74c5 -r d9cf40facbc4 master/slave.h
--- a/master/slave.h	Mon May 03 10:13:25 2010 +0200
+++ b/master/slave.h	Mon May 03 18:07:57 2010 +0200
@@ -49,6 +49,68 @@
 
 /*****************************************************************************/
 
+/** Convenience macro for printing slave-specific information to syslog.
+ *
+ * This will print the message in \a fmt with a prefixed
+ * "EtherCAT <INDEX>-<POSITION>: ", where INDEX is the master index and
+ * POSITION is the slave's ring position.
+ *
+ * \param slave EtherCAT slave
+ * \param fmt format string (like in printf())
+ * \param args arguments (optional)
+ */
+#define EC_SLAVE_INFO(slave, fmt, args...) \
+    printk(KERN_INFO "EtherCAT %u-%u: " fmt, slave->master->index, \
+            slave->ring_position, ##args)
+
+/** Convenience macro for printing slave-specific errors to syslog.
+ *
+ * This will print the message in \a fmt with a prefixed
+ * "EtherCAT <INDEX>-<POSITION>: ", where INDEX is the master index and
+ * POSITION is the slave's ring position.
+ *
+ * \param slave EtherCAT slave
+ * \param fmt format string (like in printf())
+ * \param args arguments (optional)
+ */
+#define EC_SLAVE_ERR(slave, fmt, args...) \
+    printk(KERN_ERR "EtherCAT ERROR %u-%u: " fmt, slave->master->index, \
+            slave->ring_position, ##args)
+
+/** Convenience macro for printing slave-specific warnings to syslog.
+ *
+ * This will print the message in \a fmt with a prefixed
+ * "EtherCAT <INDEX>-<POSITION>: ", where INDEX is the master index and
+ * POSITION is the slave's ring position.
+ *
+ * \param slave EtherCAT slave
+ * \param fmt format string (like in printf())
+ * \param args arguments (optional)
+ */
+#define EC_SLAVE_WARN(slave, fmt, args...) \
+    printk(KERN_WARNING "EtherCAT WARNING %u-%u: " fmt, \
+            slave->master->index, slave->ring_position, ##args)
+
+/** Convenience macro for printing slave-specific debug messages to syslog.
+ *
+ * This will print the message in \a fmt with a prefixed
+ * "EtherCAT <INDEX>-<POSITION>: ", where INDEX is the master index and
+ * POSITION is the slave's ring position.
+ *
+ * \param slave EtherCAT slave
+ * \param fmt format string (like in printf())
+ * \param args arguments (optional)
+ */
+#define EC_SLAVE_DBG(slave, level, fmt, args...) \
+    do { \
+        if (slave->master->debug_level >= level) { \
+            printk(KERN_DEBUG "EtherCAT DEBUG %u-%u: " fmt, \
+                    slave->master->index, slave->ring_position, ##args); \
+        } \
+    } while (0)
+
+/*****************************************************************************/
+
 /** Slave port.
  */
 typedef struct {