ocfs2: Compile-time disabling of ocfs2 debugging output.

Give gcc the chance to compile out the debug logging code in ocfs2.
This saves some size at the expense of being able to debug the code.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index 73edad782537..a42628ba9ddf 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -123,6 +123,17 @@
 #define MLOG_MASK_PREFIX 0
 #endif
 
+/*
+ * When logging is disabled, force the bit test to 0 for anything other
+ * than errors and notices, allowing gcc to remove the code completely.
+ * When enabled, allow all masks.
+ */
+#if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
+#define ML_ALLOWED_BITS ~0
+#else
+#define ML_ALLOWED_BITS (ML_ERROR|ML_NOTICE)
+#endif
+
 #define MLOG_MAX_BITS 64
 
 struct mlog_bits {
@@ -187,7 +198,8 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
 
 #define mlog(mask, fmt, args...) do {                                   \
         u64 __m = MLOG_MASK_PREFIX | (mask);                            \
-        if (__mlog_test_u64(__m, mlog_and_bits) &&                      \
+        if ((__m & ML_ALLOWED_BITS) &&                                  \
+            __mlog_test_u64(__m, mlog_and_bits) &&                      \
             !__mlog_test_u64(__m, mlog_not_bits)) {                     \
                 if (__m & ML_ERROR)                                     \
                         __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
@@ -204,6 +216,7 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
                 mlog(ML_ERROR, "status = %lld\n", (long long)_st);      \
 } while (0)
 
+#if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
 #define mlog_entry(fmt, args...) do {                                   \
         mlog(ML_ENTRY, "ENTRY:" fmt , ##args);                          \
 } while (0)
@@ -247,6 +260,13 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
 #define mlog_exit_void() do {                                           \
         mlog(ML_EXIT, "EXIT\n");                                        \
 } while (0)
+#else
+#define mlog_entry(...)  do { } while (0)
+#define mlog_entry_void(...)  do { } while (0)
+#define mlog_exit(...)  do { } while (0)
+#define mlog_exit_ptr(...)  do { } while (0)
+#define mlog_exit_void(...)  do { } while (0)
+#endif  /* defined(CONFIG_OCFS2_DEBUG_MASKLOG) */
 
 #define mlog_bug_on_msg(cond, fmt, args...) do {                        \
         if (cond) {                                                     \