Release 4.7 include/linux/dynamic_debug.h

#ifndef _DYNAMIC_DEBUG_H

#define _DYNAMIC_DEBUG_H

/*
 * An instance of this structure is created in a special
 * ELF section at every dynamic debug callsite.  At runtime,
 * the special section is treated as an array of these.
 */

struct _ddebug {
	/*
         * These fields are used to drive the user interface
         * for selecting and displaying debug callsites.
         */
	
const char *modname;
	
const char *function;
	
const char *filename;
	
const char *format;
	
unsigned int lineno:18;
	/*
         * The flags field controls the behaviour at the callsite.
         * The bits here are changed dynamically when the user
         * writes commands to <debugfs>/dynamic_debug/control
         */

#define _DPRINTK_FLAGS_NONE	0

#define _DPRINTK_FLAGS_PRINT	(1<<0) /* printk() a message using the format */

#define _DPRINTK_FLAGS_INCL_MODNAME	(1<<1)

#define _DPRINTK_FLAGS_INCL_FUNCNAME	(1<<2)

#define _DPRINTK_FLAGS_INCL_LINENO	(1<<3)

#define _DPRINTK_FLAGS_INCL_TID		(1<<4)
#if defined DEBUG

#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
#else

#define _DPRINTK_FLAGS_DEFAULT 0
#endif
	
unsigned int flags:8;
} __attribute__((aligned(8)));


int ddebug_add_module(struct _ddebug *tab, unsigned int n,
				const char *modname);

#if defined(CONFIG_DYNAMIC_DEBUG)
extern int ddebug_remove_module(const char *mod_name);
extern __printf(2, 3)
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...);

extern int ddebug_dyndbg_module_param_cb(char *param, char *val,
					const char *modname);

struct device;

extern __printf(3, 4)
void __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev,
		       const char *fmt, ...);

struct net_device;

extern __printf(3, 4)
void __dynamic_netdev_dbg(struct _ddebug *descriptor,
			  const struct net_device *dev,
			  const char *fmt, ...);


#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt)		\
	static struct _ddebug  __aligned(8)                     \
        __attribute__((section("__verbose"))) name = {          \
                .modname = KBUILD_MODNAME,                      \
                .function = __func__,                           \
                .filename = __FILE__,                           \
                .format = (fmt),                                \
                .lineno = __LINE__,                             \
                .flags =  _DPRINTK_FLAGS_DEFAULT,               \
        }


#define dynamic_pr_debug(fmt, ...)				\
do {                                                            \
        DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         \
        if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  \
                __dynamic_pr_debug(&descriptor, pr_fmt(fmt),    \
                                   ##__VA_ARGS__);              \
} while (0)


#define dynamic_dev_dbg(dev, fmt, ...)				\
do {                                                            \
        DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         \
        if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  \
                __dynamic_dev_dbg(&descriptor, dev, fmt,        \
                                  ##__VA_ARGS__);               \
} while (0)


#define dynamic_netdev_dbg(dev, fmt, ...)			\
do {                                                            \
        DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         \
        if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  \
                __dynamic_netdev_dbg(&descriptor, dev, fmt,     \
                                     ##__VA_ARGS__);            \
} while (0)


#define dynamic_hex_dump(prefix_str, prefix_type, rowsize,       \
			 groupsize, buf, len, ascii)		\
do {                                                            \
        DEFINE_DYNAMIC_DEBUG_METADATA(descriptor,               \
                __builtin_constant_p(prefix_str) ? prefix_str : "hexdump");\
        if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  \
                print_hex_dump(KERN_DEBUG, prefix_str,          \
                               prefix_type, rowsize, groupsize, \
                               buf, len, ascii);                \
} while (0)

#else

#include <linux/string.h>
#include <linux/errno.h>



static inline int ddebug_remove_module(const char *mod)
{
	return 0;
}

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static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
						const char *modname)
{
	if (strstr(param, "dyndbg")) {
		/* avoid pr_warn(), which wants pr_fmt() fully defined */
		printk(KERN_WARNING "dyndbg param is supported only in "
			"CONFIG_DYNAMIC_DEBUG builds\n");
		return 0; /* allow and ignore */
	}
	return -EINVAL;
}

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#define dynamic_pr_debug(fmt, ...)					\
	do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)

#define dynamic_dev_dbg(dev, fmt, ...)					\
	do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
#endif

#endif
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Directory: include/linux

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