s390/s390dbf: add debug_level_enabled() function

Add the debug_level_enabled() function to check if debug events for
a particular level would be logged.  This might help to save cycles
for debug events that require additional information collection.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/Documentation/s390/s390dbf.txt b/Documentation/s390/s390dbf.txt
index fcaf0b4efba21cfe51ed1aa4a6d9303aa614dea5..3da163383c931258641c69ce01f4f3812c97aafd 100644 (file)
--- a/Documentation/s390/s390dbf.txt
+++ b/Documentation/s390/s390dbf.txt
@@ -157,6 +157,16 @@ Return Value:  none
 
 Description:   Sets new actual debug level if new_level is valid. 
 
+---------------------------------------------------------------------------
+bool debug_level_enabled (debug_info_t * id, int level);
+
+Parameter:    id:        handle for debug log
+             level:      debug level
+
+Return Value: True if level is less or equal to the current debug level.
+
+Description:  Returns true if debug events for the specified level would be
+             logged. Otherwise returns false.
 ---------------------------------------------------------------------------
 void debug_stop_all(void);
 

diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h
index 188c5052a20ab663f878afc2c23889ec53384d8e..530c15eb01e99ad5970b556234c65d34a8bdf141 100644 (file)
--- a/arch/s390/include/asm/debug.h
+++ b/arch/s390/include/asm/debug.h
@@ -107,6 +107,11 @@ void debug_set_level(debug_info_t* id, int new_level);
 void debug_set_critical(void);
 void debug_stop_all(void);
 
+static inline bool debug_level_enabled(debug_info_t* id, int level)
+{
+       return level <= id->level;
+}
+
 static inline debug_entry_t*
 debug_event(debug_info_t* id, int level, void* data, int length)
 {