claw/lcs/netiucv: check s390dbf level before sprints

additional check of s390dbf level results in better performance
if the default low debugging level is active.

Signed-off-by: Peter Tiedemann <ptiedem@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/s390/net/lcs.h b/drivers/s390/net/lcs.h
index 8976fb0b070a..d58fea52557d 100644
--- a/drivers/s390/net/lcs.h
+++ b/drivers/s390/net/lcs.h
@@ -16,11 +16,19 @@ do { \
         debug_event(lcs_dbf_##name,level,(void*)(addr),len); \
 } while (0)
 
+/* Allow to sort out low debug levels early to avoid wasted sprints */
+static inline int lcs_dbf_passes(debug_info_t *dbf_grp, int level)
+{
+        return (level <= dbf_grp->level);
+}
+
 #define LCS_DBF_TEXT_(level,name,text...) \
-do {                                       \
-        sprintf(debug_buffer, text);  \
-                debug_text_event(lcs_dbf_##name,level, debug_buffer);\
-} while (0)
+        do { \
+                if (lcs_dbf_passes(lcs_dbf_##name, level)) { \
+                        sprintf(debug_buffer, text); \
+                        debug_text_event(lcs_dbf_##name, level, debug_buffer); \
+                } \
+        } while (0)
 
 /**
  *      sysfs related stuff