include/linux/printk.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KERNEL_PRINTK__
   3 #define __KERNEL_PRINTK__
   4
   5 #include <stdarg.h>
   6 #include <linux/init.h>
   7 #include <linux/kern_levels.h>
   8 #include <linux/linkage.h>
   9 #include <linux/cache.h>
  10 #include <linux/ratelimit_types.h>
  11 #include <linux/once_lite.h>
  12
  13 extern const char linux_banner[];
  14 extern const char linux_proc_banner[];
  15
  16 extern int oops_in_progress;    /* If set, an oops, panic(), BUG() or die() is in progress */
  17
  18 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
  19
  20 static inline int printk_get_level(const char *buffer)
  21 {
  22         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
  23                 switch (buffer[1]) {
  24                 case '0' ... '7':
  25                 case 'c':       /* KERN_CONT */
  26                         return buffer[1];
  27                 }
  28         }
  29         return 0;
  30 }
  31
  32 static inline const char *printk_skip_level(const char *buffer)
  33 {
  34         if (printk_get_level(buffer))
  35                 return buffer + 2;
  36
  37         return buffer;
  38 }
  39
  40 static inline const char *printk_skip_headers(const char *buffer)
  41 {
  42         while (printk_get_level(buffer))
  43                 buffer = printk_skip_level(buffer);
  44
  45         return buffer;
  46 }
  47
  48 #define CONSOLE_EXT_LOG_MAX     8192
  49
  50 /* printk's without a loglevel use this.. */
  51 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
  52
  53 /* We show everything that is MORE important than this.. */
  54 #define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
  55 #define CONSOLE_LOGLEVEL_MIN     1 /* Minimum loglevel we let people use */
  56 #define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
  57 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
  58
  59 /*
  60  * Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
  61  * we're now allowing both to be set from kernel config.
  62  */
  63 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
  64 #define CONSOLE_LOGLEVEL_QUIET   CONFIG_CONSOLE_LOGLEVEL_QUIET
  65
  66 extern int console_printk[];
  67
  68 #define console_loglevel (console_printk[0])
  69 #define default_message_loglevel (console_printk[1])
  70 #define minimum_console_loglevel (console_printk[2])
  71 #define default_console_loglevel (console_printk[3])
  72
  73 static inline void console_silent(void)
  74 {
  75         console_loglevel = CONSOLE_LOGLEVEL_SILENT;
  76 }
  77
  78 static inline void console_verbose(void)
  79 {
  80         if (console_loglevel)
  81                 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
  82 }
  83
  84 /* strlen("ratelimit") + 1 */
  85 #define DEVKMSG_STR_MAX_SIZE 10
  86 extern char devkmsg_log_str[];
  87 struct ctl_table;
  88
  89 extern int suppress_printk;
  90
  91 struct va_format {
  92         const char *fmt;
  93         va_list *va;
  94 };
  95
  96 /*
  97  * FW_BUG
  98  * Add this to a message where you are sure the firmware is buggy or behaves
  99  * really stupid or out of spec. Be aware that the responsible BIOS developer
 100  * should be able to fix this issue or at least get a concrete idea of the
 101  * problem by reading your message without the need of looking at the kernel
 102  * code.
 103  *
 104  * Use it for definite and high priority BIOS bugs.
 105  *
 106  * FW_WARN
 107  * Use it for not that clear (e.g. could the kernel messed up things already?)
 108  * and medium priority BIOS bugs.
 109  *
 110  * FW_INFO
 111  * Use this one if you want to tell the user or vendor about something
 112  * suspicious, but generally harmless related to the firmware.
 113  *
 114  * Use it for information or very low priority BIOS bugs.
 115  */
 116 #define FW_BUG          "[Firmware Bug]: "
 117 #define FW_WARN         "[Firmware Warn]: "
 118 #define FW_INFO         "[Firmware Info]: "
 119
 120 /*
 121  * HW_ERR
 122  * Add this to a message for hardware errors, so that user can report
 123  * it to hardware vendor instead of LKML or software vendor.
 124  */
 125 #define HW_ERR          "[Hardware Error]: "
 126
 127 /*
 128  * DEPRECATED
 129  * Add this to a message whenever you want to warn user space about the use
 130  * of a deprecated aspect of an API so they can stop using it
 131  */
 132 #define DEPRECATED      "[Deprecated]: "
 133
 134 /*
 135  * Dummy printk for disabled debugging statements to use whilst maintaining
 136  * gcc's format checking.
 137  */
 138 #define no_printk(fmt, ...)                             \
 139 ({                                                      \
 140         if (0)                                          \
 141                 printk(fmt, ##__VA_ARGS__);             \
 142         0;                                              \
 143 })
 144
 145 #ifdef CONFIG_EARLY_PRINTK
 146 extern asmlinkage __printf(1, 2)
 147 void early_printk(const char *fmt, ...);
 148 #else
 149 static inline __printf(1, 2) __cold
 150 void early_printk(const char *s, ...) { }
 151 #endif
 152
 153 #ifdef CONFIG_PRINTK_NMI
 154 extern void printk_nmi_enter(void);
 155 extern void printk_nmi_exit(void);
 156 extern void printk_nmi_direct_enter(void);
 157 extern void printk_nmi_direct_exit(void);
 158 #else
 159 static inline void printk_nmi_enter(void) { }
 160 static inline void printk_nmi_exit(void) { }
 161 static inline void printk_nmi_direct_enter(void) { }
 162 static inline void printk_nmi_direct_exit(void) { }
 163 #endif /* PRINTK_NMI */
 164
 165 struct dev_printk_info;
 166
 167 #ifdef CONFIG_PRINTK
 168 asmlinkage __printf(4, 0)
 169 int vprintk_emit(int facility, int level,
 170                  const struct dev_printk_info *dev_info,
 171                  const char *fmt, va_list args);
 172
 173 asmlinkage __printf(1, 0)
 174 int vprintk(const char *fmt, va_list args);
 175
 176 asmlinkage __printf(1, 2) __cold
 177 int printk(const char *fmt, ...);
 178
 179 /*
 180  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
 181  */
 182 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
 183
 184 /*
 185  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 186  * with all other unrelated printk_ratelimit() callsites.  Instead use
 187  * printk_ratelimited() or plain old __ratelimit().
 188  */
 189 extern int __printk_ratelimit(const char *func);
 190 #define printk_ratelimit() __printk_ratelimit(__func__)
 191 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 192                                    unsigned int interval_msec);
 193
 194 extern int printk_delay_msec;
 195 extern int dmesg_restrict;
 196
 197 extern int
 198 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void *buf,
 199                           size_t *lenp, loff_t *ppos);
 200
 201 extern void wake_up_klogd(void);
 202
 203 char *log_buf_addr_get(void);
 204 u32 log_buf_len_get(void);
 205 void log_buf_vmcoreinfo_setup(void);
 206 void __init setup_log_buf(int early);
 207 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 208 void dump_stack_print_info(const char *log_lvl);
 209 void show_regs_print_info(const char *log_lvl);
 210 extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
 211 extern asmlinkage void dump_stack(void) __cold;
 212 extern void printk_safe_flush(void);
 213 extern void printk_safe_flush_on_panic(void);
 214 #else
 215 static inline __printf(1, 0)
 216 int vprintk(const char *s, va_list args)
 217 {
 218         return 0;
 219 }
 220 static inline __printf(1, 2) __cold
 221 int printk(const char *s, ...)
 222 {
 223         return 0;
 224 }
 225 static inline __printf(1, 2) __cold
 226 int printk_deferred(const char *s, ...)
 227 {
 228         return 0;
 229 }
 230 static inline int printk_ratelimit(void)
 231 {
 232         return 0;
 233 }
 234 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 235                                           unsigned int interval_msec)
 236 {
 237         return false;
 238 }
 239
 240 static inline void wake_up_klogd(void)
 241 {
 242 }
 243
 244 static inline char *log_buf_addr_get(void)
 245 {
 246         return NULL;
 247 }
 248
 249 static inline u32 log_buf_len_get(void)
 250 {
 251         return 0;
 252 }
 253
 254 static inline void log_buf_vmcoreinfo_setup(void)
 255 {
 256 }
 257
 258 static inline void setup_log_buf(int early)
 259 {
 260 }
 261
 262 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
 263 {
 264 }
 265
 266 static inline void dump_stack_print_info(const char *log_lvl)
 267 {
 268 }
 269
 270 static inline void show_regs_print_info(const char *log_lvl)
 271 {
 272 }
 273
 274 static inline void dump_stack_lvl(const char *log_lvl)
 275 {
 276 }
 277
 278 static inline void dump_stack(void)
 279 {
 280 }
 281
 282 static inline void printk_safe_flush(void)
 283 {
 284 }
 285
 286 static inline void printk_safe_flush_on_panic(void)
 287 {
 288 }
 289 #endif
 290
 291 #ifdef CONFIG_SMP
 292 extern int __printk_cpu_trylock(void);
 293 extern void __printk_wait_on_cpu_lock(void);
 294 extern void __printk_cpu_unlock(void);
 295
 296 /**
 297  * printk_cpu_lock_irqsave() - Acquire the printk cpu-reentrant spinning
 298  *                             lock and disable interrupts.
 299  * @flags: Stack-allocated storage for saving local interrupt state,
 300  *         to be passed to printk_cpu_unlock_irqrestore().
 301  *
 302  * If the lock is owned by another CPU, spin until it becomes available.
 303  * Interrupts are restored while spinning.
 304  */
 305 #define printk_cpu_lock_irqsave(flags)          \
 306         for (;;) {                              \
 307                 local_irq_save(flags);          \
 308                 if (__printk_cpu_trylock())     \
 309                         break;                  \
 310                 local_irq_restore(flags);       \
 311                 __printk_wait_on_cpu_lock();    \
 312         }
 313
 314 /**
 315  * printk_cpu_unlock_irqrestore() - Release the printk cpu-reentrant spinning
 316  *                                  lock and restore interrupts.
 317  * @flags: Caller's saved interrupt state, from printk_cpu_lock_irqsave().
 318  */
 319 #define printk_cpu_unlock_irqrestore(flags)     \
 320         do {                                    \
 321                 __printk_cpu_unlock();          \
 322                 local_irq_restore(flags);       \
 323         } while (0)                             \
 324
 325 #else
 326
 327 #define printk_cpu_lock_irqsave(flags) ((void)flags)
 328 #define printk_cpu_unlock_irqrestore(flags) ((void)flags)
 329
 330 #endif /* CONFIG_SMP */
 331
 332 extern int kptr_restrict;
 333
 334 /**
 335  * pr_fmt - used by the pr_*() macros to generate the printk format string
 336  * @fmt: format string passed from a pr_*() macro
 337  *
 338  * This macro can be used to generate a unified format string for pr_*()
 339  * macros. A common use is to prefix all pr_*() messages in a file with a common
 340  * string. For example, defining this at the top of a source file:
 341  *
 342  *        #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 343  *
 344  * would prefix all pr_info, pr_emerg... messages in the file with the module
 345  * name.
 346  */
 347 #ifndef pr_fmt
 348 #define pr_fmt(fmt) fmt
 349 #endif
 350
 351 /**
 352  * pr_emerg - Print an emergency-level message
 353  * @fmt: format string
 354  * @...: arguments for the format string
 355  *
 356  * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
 357  * generate the format string.
 358  */
 359 #define pr_emerg(fmt, ...) \
 360         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 361 /**
 362  * pr_alert - Print an alert-level message
 363  * @fmt: format string
 364  * @...: arguments for the format string
 365  *
 366  * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
 367  * generate the format string.
 368  */
 369 #define pr_alert(fmt, ...) \
 370         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 371 /**
 372  * pr_crit - Print a critical-level message
 373  * @fmt: format string
 374  * @...: arguments for the format string
 375  *
 376  * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
 377  * generate the format string.
 378  */
 379 #define pr_crit(fmt, ...) \
 380         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 381 /**
 382  * pr_err - Print an error-level message
 383  * @fmt: format string
 384  * @...: arguments for the format string
 385  *
 386  * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
 387  * generate the format string.
 388  */
 389 #define pr_err(fmt, ...) \
 390         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 391 /**
 392  * pr_warn - Print a warning-level message
 393  * @fmt: format string
 394  * @...: arguments for the format string
 395  *
 396  * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
 397  * to generate the format string.
 398  */
 399 #define pr_warn(fmt, ...) \
 400         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 401 /**
 402  * pr_notice - Print a notice-level message
 403  * @fmt: format string
 404  * @...: arguments for the format string
 405  *
 406  * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
 407  * generate the format string.
 408  */
 409 #define pr_notice(fmt, ...) \
 410         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 411 /**
 412  * pr_info - Print an info-level message
 413  * @fmt: format string
 414  * @...: arguments for the format string
 415  *
 416  * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
 417  * generate the format string.
 418  */
 419 #define pr_info(fmt, ...) \
 420         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 421
 422 /**
 423  * pr_cont - Continues a previous log message in the same line.
 424  * @fmt: format string
 425  * @...: arguments for the format string
 426  *
 427  * This macro expands to a printk with KERN_CONT loglevel. It should only be
 428  * used when continuing a log message with no newline ('\n') enclosed. Otherwise
 429  * it defaults back to KERN_DEFAULT loglevel.
 430  */
 431 #define pr_cont(fmt, ...) \
 432         printk(KERN_CONT fmt, ##__VA_ARGS__)
 433
 434 /**
 435  * pr_devel - Print a debug-level message conditionally
 436  * @fmt: format string
 437  * @...: arguments for the format string
 438  *
 439  * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
 440  * defined. Otherwise it does nothing.
 441  *
 442  * It uses pr_fmt() to generate the format string.
 443  */
 444 #ifdef DEBUG
 445 #define pr_devel(fmt, ...) \
 446         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 447 #else
 448 #define pr_devel(fmt, ...) \
 449         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 450 #endif
 451
 452
 453 /* If you are writing a driver, please use dev_dbg instead */
 454 #if defined(CONFIG_DYNAMIC_DEBUG) || \
 455         (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 456 #include <linux/dynamic_debug.h>
 457
 458 /**
 459  * pr_debug - Print a debug-level message conditionally
 460  * @fmt: format string
 461  * @...: arguments for the format string
 462  *
 463  * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
 464  * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
 465  * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
 466  *
 467  * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
 468  * pr_fmt() internally).
 469  */
 470 #define pr_debug(fmt, ...)                      \
 471         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 472 #elif defined(DEBUG)
 473 #define pr_debug(fmt, ...) \
 474         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 475 #else
 476 #define pr_debug(fmt, ...) \
 477         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 478 #endif
 479
 480 /*
 481  * Print a one-time message (analogous to WARN_ONCE() et al):
 482  */
 483
 484 #ifdef CONFIG_PRINTK
 485 #define printk_once(fmt, ...)                                   \
 486         DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
 487 #define printk_deferred_once(fmt, ...)                          \
 488         DO_ONCE_LITE(printk_deferred, fmt, ##__VA_ARGS__)
 489 #else
 490 #define printk_once(fmt, ...)                                   \
 491         no_printk(fmt, ##__VA_ARGS__)
 492 #define printk_deferred_once(fmt, ...)                          \
 493         no_printk(fmt, ##__VA_ARGS__)
 494 #endif
 495
 496 #define pr_emerg_once(fmt, ...)                                 \
 497         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 498 #define pr_alert_once(fmt, ...)                                 \
 499         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 500 #define pr_crit_once(fmt, ...)                                  \
 501         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 502 #define pr_err_once(fmt, ...)                                   \
 503         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 504 #define pr_warn_once(fmt, ...)                                  \
 505         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 506 #define pr_notice_once(fmt, ...)                                \
 507         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 508 #define pr_info_once(fmt, ...)                                  \
 509         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 510 /* no pr_cont_once, don't do that... */
 511
 512 #if defined(DEBUG)
 513 #define pr_devel_once(fmt, ...)                                 \
 514         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 515 #else
 516 #define pr_devel_once(fmt, ...)                                 \
 517         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 518 #endif
 519
 520 /* If you are writing a driver, please use dev_dbg instead */
 521 #if defined(DEBUG)
 522 #define pr_debug_once(fmt, ...)                                 \
 523         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 524 #else
 525 #define pr_debug_once(fmt, ...)                                 \
 526         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 527 #endif
 528
 529 /*
 530  * ratelimited messages with local ratelimit_state,
 531  * no local ratelimit_state used in the !PRINTK case
 532  */
 533 #ifdef CONFIG_PRINTK
 534 #define printk_ratelimited(fmt, ...)                                    \
 535 ({                                                                      \
 536         static DEFINE_RATELIMIT_STATE(_rs,                              \
 537                                       DEFAULT_RATELIMIT_INTERVAL,       \
 538                                       DEFAULT_RATELIMIT_BURST);         \
 539                                                                         \
 540         if (__ratelimit(&_rs))                                          \
 541                 printk(fmt, ##__VA_ARGS__);                             \
 542 })
 543 #else
 544 #define printk_ratelimited(fmt, ...)                                    \
 545         no_printk(fmt, ##__VA_ARGS__)
 546 #endif
 547
 548 #define pr_emerg_ratelimited(fmt, ...)                                  \
 549         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 550 #define pr_alert_ratelimited(fmt, ...)                                  \
 551         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 552 #define pr_crit_ratelimited(fmt, ...)                                   \
 553         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 554 #define pr_err_ratelimited(fmt, ...)                                    \
 555         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 556 #define pr_warn_ratelimited(fmt, ...)                                   \
 557         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 558 #define pr_notice_ratelimited(fmt, ...)                                 \
 559         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 560 #define pr_info_ratelimited(fmt, ...)                                   \
 561         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 562 /* no pr_cont_ratelimited, don't do that... */
 563
 564 #if defined(DEBUG)
 565 #define pr_devel_ratelimited(fmt, ...)                                  \
 566         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 567 #else
 568 #define pr_devel_ratelimited(fmt, ...)                                  \
 569         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 570 #endif
 571
 572 /* If you are writing a driver, please use dev_dbg instead */
 573 #if defined(CONFIG_DYNAMIC_DEBUG) || \
 574         (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 575 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 576 #define pr_debug_ratelimited(fmt, ...)                                  \
 577 do {                                                                    \
 578         static DEFINE_RATELIMIT_STATE(_rs,                              \
 579                                       DEFAULT_RATELIMIT_INTERVAL,       \
 580                                       DEFAULT_RATELIMIT_BURST);         \
 581         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
 582         if (DYNAMIC_DEBUG_BRANCH(descriptor) &&                         \
 583             __ratelimit(&_rs))                                          \
 584                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
 585 } while (0)
 586 #elif defined(DEBUG)
 587 #define pr_debug_ratelimited(fmt, ...)                                  \
 588         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 589 #else
 590 #define pr_debug_ratelimited(fmt, ...) \
 591         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 592 #endif
 593
 594 extern const struct file_operations kmsg_fops;
 595
 596 enum {
 597         DUMP_PREFIX_NONE,
 598         DUMP_PREFIX_ADDRESS,
 599         DUMP_PREFIX_OFFSET
 600 };
 601 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 602                               int groupsize, char *linebuf, size_t linebuflen,
 603                               bool ascii);
 604 #ifdef CONFIG_PRINTK
 605 extern void print_hex_dump(const char *level, const char *prefix_str,
 606                            int prefix_type, int rowsize, int groupsize,
 607                            const void *buf, size_t len, bool ascii);
 608 #else
 609 static inline void print_hex_dump(const char *level, const char *prefix_str,
 610                                   int prefix_type, int rowsize, int groupsize,
 611                                   const void *buf, size_t len, bool ascii)
 612 {
 613 }
 614 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 615                                         const void *buf, size_t len)
 616 {
 617 }
 618
 619 #endif
 620
 621 #if defined(CONFIG_DYNAMIC_DEBUG) || \
 622         (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 623 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 624                              groupsize, buf, len, ascii)        \
 625         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 626                          groupsize, buf, len, ascii)
 627 #elif defined(DEBUG)
 628 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 629                              groupsize, buf, len, ascii)                \
 630         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 631                        groupsize, buf, len, ascii)
 632 #else
 633 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 634                                         int rowsize, int groupsize,
 635                                         const void *buf, size_t len, bool ascii)
 636 {
 637 }
 638 #endif
 639
 640 /**
 641  * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
 642  * @prefix_str: string to prefix each line with;
 643  *  caller supplies trailing spaces for alignment if desired
 644  * @prefix_type: controls whether prefix of an offset, address, or none
 645  *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
 646  * @buf: data blob to dump
 647  * @len: number of bytes in the @buf
 648  *
 649  * Calls print_hex_dump(), with log level of KERN_DEBUG,
 650  * rowsize of 16, groupsize of 1, and ASCII output included.
 651  */
 652 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 653         print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
 654
 655 #endif