forked from luck/tmp_suning_uos_patched
ff49d74ad3
We should initialize the module dynamic debug datastructures only after determining that the module is not loaded yet. This fixes a bug that introduced in 2.6.35-rc2, where when a trying to load a module twice, we also load it's dynamic printing data twice which causes all sorts of nasty issues. Also handle the dynamic debug cleanup later on failure. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (removed a #ifdef) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
#ifndef _DYNAMIC_DEBUG_H
|
|
#define _DYNAMIC_DEBUG_H
|
|
|
|
/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
|
|
* bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
|
|
* use independent hash functions, to reduce the chance of false positives.
|
|
*/
|
|
extern long long dynamic_debug_enabled;
|
|
extern long long dynamic_debug_enabled2;
|
|
|
|
/*
|
|
* 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;
|
|
char primary_hash;
|
|
char secondary_hash;
|
|
unsigned int lineno:24;
|
|
/*
|
|
* 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_PRINT (1<<0) /* printk() a message using the format */
|
|
#define _DPRINTK_FLAGS_DEFAULT 0
|
|
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);
|
|
|
|
#define __dynamic_dbg_enabled(dd) ({ \
|
|
int __ret = 0; \
|
|
if (unlikely((dynamic_debug_enabled & (1LL << DEBUG_HASH)) && \
|
|
(dynamic_debug_enabled2 & (1LL << DEBUG_HASH2)))) \
|
|
if (unlikely(dd.flags)) \
|
|
__ret = 1; \
|
|
__ret; })
|
|
|
|
#define dynamic_pr_debug(fmt, ...) do { \
|
|
static struct _ddebug descriptor \
|
|
__used \
|
|
__attribute__((section("__verbose"), aligned(8))) = \
|
|
{ KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
|
|
DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
|
|
if (__dynamic_dbg_enabled(descriptor)) \
|
|
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
|
|
#define dynamic_dev_dbg(dev, fmt, ...) do { \
|
|
static struct _ddebug descriptor \
|
|
__used \
|
|
__attribute__((section("__verbose"), aligned(8))) = \
|
|
{ KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
|
|
DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
|
|
if (__dynamic_dbg_enabled(descriptor)) \
|
|
dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#else
|
|
|
|
static inline int ddebug_remove_module(const char *mod)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define dynamic_pr_debug(fmt, ...) \
|
|
do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
|
|
#define dynamic_dev_dbg(dev, format, ...) \
|
|
do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
|
|
#endif
|
|
|
|
#endif
|