Ingo,
It would seem that in the latest patch RT-V0.7.45-00 we have reverted back to removing the define of jbd_debug which the attached patch (against one of the 2.6.11 versions) fixed.
-- kr
--- linux-2.6.11/include/linux/jbd.h.orig 2005-03-16 09:18:51.000000000
-0600
+++ linux-2.6.11/include/linux/jbd.h 2005-03-16 09:19:24.000000000 -0600
@@ -65,6 +65,7 @@ extern int journal_enable_debug;
} \
} while (0)
#else
+#define jbd_debug(f, a...) /**/
#endif
extern void * __jbd_kmalloc (const char *where, size_t size, int flags, int
retry);

