root/include/linux/ceph/ceph_debug.h

INCLUDED FROM

#ifndef _FS_CEPH_DEBUG_H
#define _FS_CEPH_DEBUG_H

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#ifdef CONFIG_CEPH_LIB_PRETTYDEBUG

/*
 * wrap pr_debug to include a filename:lineno prefix on each line.
 * this incurs some overhead (kernel size and execution time) due to
 * the extra function call at each call site.
 */

# if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
extern const char *ceph_file_part(const char *s, int len);
#  define dout(fmt, ...)                                                \
        pr_debug("%.*s %12.12s:%-4d : " fmt,                            \
                 8 - (int)sizeof(KBUILD_MODNAME), "    ",               \
                 ceph_file_part(__FILE__, sizeof(__FILE__)),            \
                 __LINE__, ##__VA_ARGS__)
# else
/* faux printk call just to see any compiler warnings. */
#  define dout(fmt, ...)        do {                            \
                if (0)                                          \
                        printk(KERN_DEBUG fmt, ##__VA_ARGS__);  \
        } while (0)
# endif

#else

/*
 * or, just wrap pr_debug
 */
# define dout(fmt, ...) pr_debug(" " fmt, ##__VA_ARGS__)

#endif

#endif