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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __KERNEL_PRINTK__
 #define __KERNEL_PRINTK__
 
 #include <linux/stdarg.h>
 #include <linux/init.h>
 #include <linux/kern_levels.h>
 #include <linux/linkage.h>
 #include <linux/ratelimit_types.h>
 #include <linux/once_lite.h>
 
 extern const char linux_banner[];
 extern const char linux_proc_banner[];
 
 extern int oops_in_progress;    /* If set, an oops, panic(), BUG() or die() is in progress */
 
 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
 
 static inline int printk_get_level(const char *buffer)
 {
     if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
         switch (buffer[1]) {
         case '0' ... '7':
         case 'c':   /* KERN_CONT */
             return buffer[1];
         }
     }
     return 0;
 }
 
 static inline const char *printk_skip_level(const char *buffer)
 {
     if (printk_get_level(buffer))
         return buffer + 2;
 
     return buffer;
 }
 
 static inline const char *printk_skip_headers(const char *buffer)
 {
     while (printk_get_level(buffer))
         buffer = printk_skip_level(buffer);
 
     return buffer;
 }
 
 #define CONSOLE_EXT_LOG_MAX 8192
 
 /* printk's without a loglevel use this.. */
 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
 
 /* We show everything that is MORE important than this.. */
 #define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
 #define CONSOLE_LOGLEVEL_MIN     1 /* Minimum loglevel we let people use */
 #define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
 
 /*
  * Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
  * we're now allowing both to be set from kernel config.
  */
 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
 #define CONSOLE_LOGLEVEL_QUIET   CONFIG_CONSOLE_LOGLEVEL_QUIET
 
 extern int console_printk[];
 
 #define console_loglevel (console_printk[0])
 #define default_message_loglevel (console_printk[1])
 #define minimum_console_loglevel (console_printk[2])
 #define default_console_loglevel (console_printk[3])
 
 extern void console_verbose(void);
 
 /* strlen("ratelimit") + 1 */
 #define DEVKMSG_STR_MAX_SIZE 10
 extern char devkmsg_log_str[];
 struct ctl_table;
 
 extern int suppress_printk;
 
 struct va_format {
     const char *fmt;
     va_list *va;
 };
 
 /*
  * FW_BUG
  * Add this to a message where you are sure the firmware is buggy or behaves
  * really stupid or out of spec. Be aware that the responsible BIOS developer
  * should be able to fix this issue or at least get a concrete idea of the
  * problem by reading your message without the need of looking at the kernel
  * code.
  *
  * Use it for definite and high priority BIOS bugs.
  *
  * FW_WARN
  * Use it for not that clear (e.g. could the kernel messed up things already?)
  * and medium priority BIOS bugs.
  *
  * FW_INFO
  * Use this one if you want to tell the user or vendor about something
  * suspicious, but generally harmless related to the firmware.
  *
  * Use it for information or very low priority BIOS bugs.
  */
 #define FW_BUG      "[Firmware Bug]: "
 #define FW_WARN     "[Firmware Warn]: "
 #define FW_INFO     "[Firmware Info]: "
 
 /*
  * HW_ERR
  * Add this to a message for hardware errors, so that user can report
  * it to hardware vendor instead of LKML or software vendor.
  */
 #define HW_ERR      "[Hardware Error]: "
 
 /*
  * DEPRECATED
  * Add this to a message whenever you want to warn user space about the use
  * of a deprecated aspect of an API so they can stop using it
  */
 #define DEPRECATED  "[Deprecated]: "
 
 /*
  * Dummy printk for disabled debugging statements to use whilst maintaining
  * gcc's format checking.
  */
 #define no_printk(fmt, ...)             \
 ({                          \
     if (0)                      \
         printk(fmt, ##__VA_ARGS__);     \
     0;                      \
 })
 
 #ifdef CONFIG_EARLY_PRINTK
 extern asmlinkage __printf(1, 2)
 void early_printk(const char *fmt, ...);
 #else
 static inline __printf(1, 2) __cold
 void early_printk(const char *s, ...) { }
 #endif
 
 struct dev_printk_info;
 
 #ifdef CONFIG_PRINTK
 asmlinkage __printf(4, 0)
 int vprintk_emit(int facility, int level,
          const struct dev_printk_info *dev_info,
          const char *fmt, va_list args);
 
 asmlinkage __printf(1, 0)
 int vprintk(const char *fmt, va_list args);
 
 asmlinkage __printf(1, 2) __cold
 int _printk(const char *fmt, ...);
 
 /*
  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
  */
 __printf(1, 2) __cold int _printk_deferred(const char *fmt, ...);
 
 extern void __printk_safe_enter(void);
 extern void __printk_safe_exit(void);
 /*
  * The printk_deferred_enter/exit macros are available only as a hack for
  * some code paths that need to defer all printk console printing. Interrupts
  * must be disabled for the deferred duration.
  */
 #define printk_deferred_enter __printk_safe_enter
 #define printk_deferred_exit __printk_safe_exit
 
 extern bool pr_flush(int timeout_ms, bool reset_on_progress);
 
 /*
  * Please don't use printk_ratelimit(), because it shares ratelimiting state
  * with all other unrelated printk_ratelimit() callsites.  Instead use
  * printk_ratelimited() or plain old __ratelimit().
  */
 extern int __printk_ratelimit(const char *func);
 #define printk_ratelimit() __printk_ratelimit(__func__)
 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
                    unsigned int interval_msec);
 
 extern int printk_delay_msec;
 extern int dmesg_restrict;
 
 extern void wake_up_klogd(void);
 
 char *log_buf_addr_get(void);
 u32 log_buf_len_get(void);
 void log_buf_vmcoreinfo_setup(void);
 void __init setup_log_buf(int early);
 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 void dump_stack_print_info(const char *log_lvl);
 void show_regs_print_info(const char *log_lvl);
 extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
 extern asmlinkage void dump_stack(void) __cold;
 void printk_trigger_flush(void);
 #else
 static inline __printf(1, 0)
 int vprintk(const char *s, va_list args)
 {
     return 0;
 }
 static inline __printf(1, 2) __cold
 int _printk(const char *s, ...)
 {
     return 0;
 }
 static inline __printf(1, 2) __cold
 int _printk_deferred(const char *s, ...)
 {
     return 0;
 }
 
 static inline void printk_deferred_enter(void)
 {
 }
 
 static inline void printk_deferred_exit(void)
 {
 }
 
 static inline bool pr_flush(int timeout_ms, bool reset_on_progress)
 {
     return true;
 }
 
 static inline int printk_ratelimit(void)
 {
     return 0;
 }
 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
                       unsigned int interval_msec)
 {
     return false;
 }
 
 static inline void wake_up_klogd(void)
 {
 }
 
 static inline char *log_buf_addr_get(void)
 {
     return NULL;
 }
 
 static inline u32 log_buf_len_get(void)
 {
     return 0;
 }
 
 static inline void log_buf_vmcoreinfo_setup(void)
 {
 }
 
 static inline void setup_log_buf(int early)
 {
 }
 
 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
 {
 }
 
 static inline void dump_stack_print_info(const char *log_lvl)
 {
 }
 
 static inline void show_regs_print_info(const char *log_lvl)
 {
 }
 
 static inline void dump_stack_lvl(const char *log_lvl)
 {
 }
 
 static inline void dump_stack(void)
 {
 }
 static inline void printk_trigger_flush(void)
 {
 }
 #endif
 
 #ifdef CONFIG_SMP
 extern int __printk_cpu_sync_try_get(void);
 extern void __printk_cpu_sync_wait(void);
 extern void __printk_cpu_sync_put(void);
 
 #else
 
 #define __printk_cpu_sync_try_get() true
 #define __printk_cpu_sync_wait()
 #define __printk_cpu_sync_put()
 #endif /* CONFIG_SMP */
 
 /**
  * printk_cpu_sync_get_irqsave() - Disable interrupts and acquire the printk
  *                                 cpu-reentrant spinning lock.
  * @flags: Stack-allocated storage for saving local interrupt state,
  *         to be passed to printk_cpu_sync_put_irqrestore().
  *
  * If the lock is owned by another CPU, spin until it becomes available.
  * Interrupts are restored while spinning.
  *
  * CAUTION: This function must be used carefully. It does not behave like a
  * typical lock. Here are important things to watch out for...
  *
  *     * This function is reentrant on the same CPU. Therefore the calling
  *       code must not assume exclusive access to data if code accessing the
  *       data can run reentrant or within NMI context on the same CPU.
  *
  *     * If there exists usage of this function from NMI context, it becomes
  *       unsafe to perform any type of locking or spinning to wait for other
  *       CPUs after calling this function from any context. This includes
  *       using spinlocks or any other busy-waiting synchronization methods.
  */
 #define printk_cpu_sync_get_irqsave(flags)      \
     for (;;) {                  \
         local_irq_save(flags);          \
         if (__printk_cpu_sync_try_get())    \
             break;              \
         local_irq_restore(flags);       \
         __printk_cpu_sync_wait();       \
     }
 
 /**
  * printk_cpu_sync_put_irqrestore() - Release the printk cpu-reentrant spinning
  *                                    lock and restore interrupts.
  * @flags: Caller's saved interrupt state, from printk_cpu_sync_get_irqsave().
  */
 #define printk_cpu_sync_put_irqrestore(flags)   \
     do {                    \
         __printk_cpu_sync_put();    \
         local_irq_restore(flags);   \
     } while (0)
 
 extern int kptr_restrict;
 
 /**
  * pr_fmt - used by the pr_*() macros to generate the printk format string
  * @fmt: format string passed from a pr_*() macro
  *
  * This macro can be used to generate a unified format string for pr_*()
  * macros. A common use is to prefix all pr_*() messages in a file with a common
  * string. For example, defining this at the top of a source file:
  *
  *        #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  *
  * would prefix all pr_info, pr_emerg... messages in the file with the module
  * name.
  */
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
 #endif
 
 struct module;
 
 #ifdef CONFIG_PRINTK_INDEX
 struct pi_entry {
     const char *fmt;
     const char *func;
     const char *file;
     unsigned int line;
 
     /*
      * While printk and pr_* have the level stored in the string at compile
      * time, some subsystems dynamically add it at runtime through the
      * format string. For these dynamic cases, we allow the subsystem to
      * tell us the level at compile time.
      *
      * NULL indicates that the level, if any, is stored in fmt.
      */
     const char *level;
 
     /*
      * The format string used by various subsystem specific printk()
      * wrappers to prefix the message.
      *
      * Note that the static prefix defined by the pr_fmt() macro is stored
      * directly in the message format (@fmt), not here.
      */
     const char *subsys_fmt_prefix;
 } __packed;
 
 #define __printk_index_emit(_fmt, _level, _subsys_fmt_prefix)       \
     do {                                \
         if (__builtin_constant_p(_fmt) && __builtin_constant_p(_level)) { \
             /*
              * We check __builtin_constant_p multiple times here
              * for the same input because GCC will produce an error
              * if we try to assign a static variable to fmt if it
              * is not a constant, even with the outer if statement.
              */                     \
             static const struct pi_entry _entry     \
             __used = {                  \
                 .fmt = __builtin_constant_p(_fmt) ? (_fmt) : NULL, \
                 .func = __func__,           \
                 .file = __FILE__,           \
                 .line = __LINE__,           \
                 .level = __builtin_constant_p(_level) ? (_level) : NULL, \
                 .subsys_fmt_prefix = _subsys_fmt_prefix,\
             };                      \
             static const struct pi_entry *_entry_ptr    \
             __used __section(".printk_index") = &_entry;    \
         }                           \
     } while (0)
 
 #else /* !CONFIG_PRINTK_INDEX */
 #define __printk_index_emit(...) do {} while (0)
 #endif /* CONFIG_PRINTK_INDEX */
 
 /*
  * Some subsystems have their own custom printk that applies a va_format to a
  * generic format, for example, to include a device number or other metadata
  * alongside the format supplied by the caller.
  *
  * In order to store these in the way they would be emitted by the printk
  * infrastructure, the subsystem provides us with the start, fixed string, and
  * any subsequent text in the format string.
  *
  * We take a variable argument list as pr_fmt/dev_fmt/etc are sometimes passed
  * as multiple arguments (eg: `"%s: ", "blah"`), and we must only take the
  * first one.
  *
  * subsys_fmt_prefix must be known at compile time, or compilation will fail
  * (since this is a mistake). If fmt or level is not known at compile time, no
  * index entry will be made (since this can legitimately happen).
  */
 #define printk_index_subsys_emit(subsys_fmt_prefix, level, fmt, ...) \
     __printk_index_emit(fmt, level, subsys_fmt_prefix)
 
 #define printk_index_wrap(_p_func, _fmt, ...)               \
     ({                              \
         __printk_index_emit(_fmt, NULL, NULL);          \
         _p_func(_fmt, ##__VA_ARGS__);               \
     })
 
 
 /**
  * printk - print a kernel message
  * @fmt: format string
  *
  * This is printk(). It can be called from any context. We want it to work.
  *
  * If printk indexing is enabled, _printk() is called from printk_index_wrap.
  * Otherwise, printk is simply #defined to _printk.
  *
  * We try to grab the console_lock. If we succeed, it's easy - we log the
  * output and call the console drivers.  If we fail to get the semaphore, we
  * place the output into the log buffer and return. The current holder of
  * the console_sem will notice the new output in console_unlock(); and will
  * send it to the consoles before releasing the lock.
  *
  * One effect of this deferred printing is that code which calls printk() and
  * then changes console_loglevel may break. This is because console_loglevel
  * is inspected when the actual printing occurs.
  *
  * See also:
  * printf(3)
  *
  * See the vsnprintf() documentation for format string extensions over C99.
  */
 #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
 #define printk_deferred(fmt, ...)                   \
     printk_index_wrap(_printk_deferred, fmt, ##__VA_ARGS__)
 
 /**
  * pr_emerg - Print an emergency-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_emerg(fmt, ...) \
     printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_alert - Print an alert-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_alert(fmt, ...) \
     printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_crit - Print a critical-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_crit(fmt, ...) \
     printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_err - Print an error-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_err(fmt, ...) \
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_warn - Print a warning-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
  * to generate the format string.
  */
 #define pr_warn(fmt, ...) \
     printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_notice - Print a notice-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_notice(fmt, ...) \
     printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 /**
  * pr_info - Print an info-level message
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
  * generate the format string.
  */
 #define pr_info(fmt, ...) \
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 
 /**
  * pr_cont - Continues a previous log message in the same line.
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_CONT loglevel. It should only be
  * used when continuing a log message with no newline ('\n') enclosed. Otherwise
  * it defaults back to KERN_DEFAULT loglevel.
  */
 #define pr_cont(fmt, ...) \
     printk(KERN_CONT fmt, ##__VA_ARGS__)
 
 /**
  * pr_devel - Print a debug-level message conditionally
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
  * defined. Otherwise it does nothing.
  *
  * It uses pr_fmt() to generate the format string.
  */
 #ifdef DEBUG
 #define pr_devel(fmt, ...) \
     printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_devel(fmt, ...) \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 
 /* If you are writing a driver, please use dev_dbg instead */
 #if defined(CONFIG_DYNAMIC_DEBUG) || \
     (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 #include <linux/dynamic_debug.h>
 
 /**
  * pr_debug - Print a debug-level message conditionally
  * @fmt: format string
  * @...: arguments for the format string
  *
  * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
  * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
  * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
  *
  * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
  * pr_fmt() internally).
  */
 #define pr_debug(fmt, ...)          \
     dynamic_pr_debug(fmt, ##__VA_ARGS__)
 #elif defined(DEBUG)
 #define pr_debug(fmt, ...) \
     printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_debug(fmt, ...) \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 /*
  * Print a one-time message (analogous to WARN_ONCE() et al):
  */
 
 #ifdef CONFIG_PRINTK
 #define printk_once(fmt, ...)                   \
     DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
 #define printk_deferred_once(fmt, ...)              \
     DO_ONCE_LITE(printk_deferred, fmt, ##__VA_ARGS__)
 #else
 #define printk_once(fmt, ...)                   \
     no_printk(fmt, ##__VA_ARGS__)
 #define printk_deferred_once(fmt, ...)              \
     no_printk(fmt, ##__VA_ARGS__)
 #endif
 
 #define pr_emerg_once(fmt, ...)                 \
     printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_alert_once(fmt, ...)                 \
     printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_crit_once(fmt, ...)                  \
     printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_err_once(fmt, ...)                   \
     printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_warn_once(fmt, ...)                  \
     printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_notice_once(fmt, ...)                \
     printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_info_once(fmt, ...)                  \
     printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 /* no pr_cont_once, don't do that... */
 
 #if defined(DEBUG)
 #define pr_devel_once(fmt, ...)                 \
     printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_devel_once(fmt, ...)                 \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 /* If you are writing a driver, please use dev_dbg instead */
 #if defined(DEBUG)
 #define pr_debug_once(fmt, ...)                 \
     printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_debug_once(fmt, ...)                 \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 /*
  * ratelimited messages with local ratelimit_state,
  * no local ratelimit_state used in the !PRINTK case
  */
 #ifdef CONFIG_PRINTK
 #define printk_ratelimited(fmt, ...)                    \
 ({                                  \
     static DEFINE_RATELIMIT_STATE(_rs,              \
                       DEFAULT_RATELIMIT_INTERVAL,   \
                       DEFAULT_RATELIMIT_BURST);     \
                                     \
     if (__ratelimit(&_rs))                      \
         printk(fmt, ##__VA_ARGS__);             \
 })
 #else
 #define printk_ratelimited(fmt, ...)                    \
     no_printk(fmt, ##__VA_ARGS__)
 #endif
 
 #define pr_emerg_ratelimited(fmt, ...)                  \
     printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_alert_ratelimited(fmt, ...)                  \
     printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_crit_ratelimited(fmt, ...)                   \
     printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_err_ratelimited(fmt, ...)                    \
     printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_warn_ratelimited(fmt, ...)                   \
     printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_notice_ratelimited(fmt, ...)                 \
     printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_info_ratelimited(fmt, ...)                   \
     printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 /* no pr_cont_ratelimited, don't do that... */
 
 #if defined(DEBUG)
 #define pr_devel_ratelimited(fmt, ...)                  \
     printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_devel_ratelimited(fmt, ...)                  \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 /* If you are writing a driver, please use dev_dbg instead */
 #if defined(CONFIG_DYNAMIC_DEBUG) || \
     (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 #define pr_debug_ratelimited(fmt, ...)                  \
 do {                                    \
     static DEFINE_RATELIMIT_STATE(_rs,              \
                       DEFAULT_RATELIMIT_INTERVAL,   \
                       DEFAULT_RATELIMIT_BURST);     \
     DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));     \
     if (DYNAMIC_DEBUG_BRANCH(descriptor) &&             \
         __ratelimit(&_rs))                      \
         __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
 } while (0)
 #elif defined(DEBUG)
 #define pr_debug_ratelimited(fmt, ...)                  \
     printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_debug_ratelimited(fmt, ...) \
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #endif
 
 extern const struct file_operations kmsg_fops;
 
 enum {
     DUMP_PREFIX_NONE,
     DUMP_PREFIX_ADDRESS,
     DUMP_PREFIX_OFFSET
 };
 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
                   int groupsize, char *linebuf, size_t linebuflen,
                   bool ascii);
 #ifdef CONFIG_PRINTK
 extern void print_hex_dump(const char *level, const char *prefix_str,
                int prefix_type, int rowsize, int groupsize,
                const void *buf, size_t len, bool ascii);
 #else
 static inline void print_hex_dump(const char *level, const char *prefix_str,
                   int prefix_type, int rowsize, int groupsize,
                   const void *buf, size_t len, bool ascii)
 {
 }
 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
                     const void *buf, size_t len)
 {
 }
 
 #endif
 
 #if defined(CONFIG_DYNAMIC_DEBUG) || \
     (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
                  groupsize, buf, len, ascii)    \
     dynamic_hex_dump(prefix_str, prefix_type, rowsize,  \
              groupsize, buf, len, ascii)
 #elif defined(DEBUG)
 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,      \
                  groupsize, buf, len, ascii)        \
     print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
                groupsize, buf, len, ascii)
 #else
 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
                     int rowsize, int groupsize,
                     const void *buf, size_t len, bool ascii)
 {
 }
 #endif
 
 /**
  * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
  * @prefix_str: string to prefix each line with;
  *  caller supplies trailing spaces for alignment if desired
  * @prefix_type: controls whether prefix of an offset, address, or none
  *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
  *
  * Calls print_hex_dump(), with log level of KERN_DEBUG,
  * rowsize of 16, groupsize of 1, and ASCII output included.
  */
 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
     print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
 
 #endif

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