| | 1 | #ifndef _DYNAMIC_DEBUG_H |
| | 2 | #define _DYNAMIC_DEBUG_H |
| | 3 | |
| | 4 | /* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which |
| | 5 | * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They |
| | 6 | * use independent hash functions, to reduce the chance of false positives. |
| | 7 | */ |
| | 8 | extern long long dynamic_debug_enabled; |
| | 9 | extern long long dynamic_debug_enabled2; |
| | 10 | |
| | 11 | /* |
| | 12 | * An instance of this structure is created in a special |
| | 13 | * ELF section at every dynamic debug callsite. At runtime, |
| | 14 | * the special section is treated as an array of these. |
| | 15 | */ |
| | 16 | struct _ddebug { |
| | 17 | /* |
| | 18 | * These fields are used to drive the user interface |
| | 19 | * for selecting and displaying debug callsites. |
| | 20 | */ |
| | 21 | const char *modname; |
| | 22 | const char *function; |
| | 23 | const char *filename; |
| | 24 | const char *format; |
| | 25 | unsigned int lineno:24; |
| | 26 | /* |
| | 27 | * The flags field controls the behaviour at the callsite. |
| | 28 | * The bits here are changed dynamically when the user |
| | 29 | * writes commands to <debugfs>/dynamic_debug/control |
| | 30 | */ |
| | 31 | #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ |
| | 32 | #define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) |
| | 33 | #define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) |
| | 34 | #define _DPRINTK_FLAGS_INCL_LINENO (1<<3) |
| | 35 | #define _DPRINTK_FLAGS_INCL_TID (1<<4) |
| | 36 | #define _DPRINTK_FLAGS_DEFAULT 0 |
| | 37 | unsigned int flags:8; |
| | 38 | char enabled; |
| | 39 | } __attribute__((aligned(8))); |
| | 40 | |
| | 41 | |
| | 42 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, |
| | 43 | const char *modname); |
| | 44 | |
| | 45 | #if defined(CONFIG_DYNAMIC_DEBUG) |
| | 46 | extern int ddebug_remove_module(const char *mod_name); |
| | 47 | extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
| | 48 | __attribute__ ((format (printf, 2, 3))); |
| | 49 | |
| | 50 | #define dynamic_pr_debug(fmt, ...) do { \ |
| | 51 | static struct _ddebug descriptor \ |
| | 52 | __used \ |
| | 53 | __attribute__((section("__verbose"), aligned(8))) = \ |
| | 54 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
| | 55 | _DPRINTK_FLAGS_DEFAULT }; \ |
| | 56 | if (unlikely(descriptor.enabled)) \ |
| | 57 | __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \ |
| | 58 | } while (0) |
| | 59 | |
| | 60 | |
| | 61 | #define dynamic_dev_dbg(dev, fmt, ...) do { \ |
| | 62 | static struct _ddebug descriptor \ |
| | 63 | __used \ |
| | 64 | __attribute__((section("__verbose"), aligned(8))) = \ |
| | 65 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
| | 66 | _DPRINTK_FLAGS_DEFAULT }; \ |
| | 67 | if (unlikely(descriptor.enabled)) \ |
| | 68 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ |
| | 69 | } while (0) |
| | 70 | |
| | 71 | #else |
| | 72 | |
| | 73 | static inline int ddebug_remove_module(const char *mod) |
| | 74 | { |
| | 75 | return 0; |
| | 76 | } |
| | 77 | |
| | 78 | #define dynamic_pr_debug(fmt, ...) \ |
| | 79 | do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) |
| | 80 | #define dynamic_dev_dbg(dev, fmt, ...) \ |
| | 81 | do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) |
| | 82 | #endif |
| | 83 | |
| | 84 | #endif |
projects / linux-2.6-block.git / blame_incremental