linux/include/linux/ftrace.h
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   1/*
   2 * Ftrace header.  For implementation details beyond the random comments
   3 * scattered below, see: Documentation/trace/ftrace-design.txt
   4 */
   5
   6#ifndef _LINUX_FTRACE_H
   7#define _LINUX_FTRACE_H
   8
   9#include <linux/trace_clock.h>
  10#include <linux/kallsyms.h>
  11#include <linux/linkage.h>
  12#include <linux/bitops.h>
  13#include <linux/ktime.h>
  14#include <linux/sched.h>
  15#include <linux/types.h>
  16#include <linux/init.h>
  17#include <linux/fs.h>
  18
  19#include <asm/ftrace.h>
  20
  21struct module;
  22struct ftrace_hash;
  23
  24#ifdef CONFIG_FUNCTION_TRACER
  25
  26extern int ftrace_enabled;
  27extern int
  28ftrace_enable_sysctl(struct ctl_table *table, int write,
  29                     void __user *buffer, size_t *lenp,
  30                     loff_t *ppos);
  31
  32typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
  33
  34/*
  35 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
  36 * set in the flags member.
  37 *
  38 * ENABLED - set/unset when ftrace_ops is registered/unregistered
  39 * GLOBAL  - set manualy by ftrace_ops user to denote the ftrace_ops
  40 *           is part of the global tracers sharing the same filter
  41 *           via set_ftrace_* debugfs files.
  42 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
  43 *           allocated ftrace_ops which need special care
  44 * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
  45 *           could be controled by following calls:
  46 *             ftrace_function_local_enable
  47 *             ftrace_function_local_disable
  48 */
  49enum {
  50        FTRACE_OPS_FL_ENABLED           = 1 << 0,
  51        FTRACE_OPS_FL_GLOBAL            = 1 << 1,
  52        FTRACE_OPS_FL_DYNAMIC           = 1 << 2,
  53        FTRACE_OPS_FL_CONTROL           = 1 << 3,
  54};
  55
  56struct ftrace_ops {
  57        ftrace_func_t                   func;
  58        struct ftrace_ops               *next;
  59        unsigned long                   flags;
  60        int __percpu                    *disabled;
  61#ifdef CONFIG_DYNAMIC_FTRACE
  62        struct ftrace_hash              *notrace_hash;
  63        struct ftrace_hash              *filter_hash;
  64#endif
  65};
  66
  67extern int function_trace_stop;
  68
  69/*
  70 * Type of the current tracing.
  71 */
  72enum ftrace_tracing_type_t {
  73        FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
  74        FTRACE_TYPE_RETURN,     /* Hook the return of the function */
  75};
  76
  77/* Current tracing type, default is FTRACE_TYPE_ENTER */
  78extern enum ftrace_tracing_type_t ftrace_tracing_type;
  79
  80/**
  81 * ftrace_stop - stop function tracer.
  82 *
  83 * A quick way to stop the function tracer. Note this an on off switch,
  84 * it is not something that is recursive like preempt_disable.
  85 * This does not disable the calling of mcount, it only stops the
  86 * calling of functions from mcount.
  87 */
  88static inline void ftrace_stop(void)
  89{
  90        function_trace_stop = 1;
  91}
  92
  93/**
  94 * ftrace_start - start the function tracer.
  95 *
  96 * This function is the inverse of ftrace_stop. This does not enable
  97 * the function tracing if the function tracer is disabled. This only
  98 * sets the function tracer flag to continue calling the functions
  99 * from mcount.
 100 */
 101static inline void ftrace_start(void)
 102{
 103        function_trace_stop = 0;
 104}
 105
 106/*
 107 * The ftrace_ops must be a static and should also
 108 * be read_mostly.  These functions do modify read_mostly variables
 109 * so use them sparely. Never free an ftrace_op or modify the
 110 * next pointer after it has been registered. Even after unregistering
 111 * it, the next pointer may still be used internally.
 112 */
 113int register_ftrace_function(struct ftrace_ops *ops);
 114int unregister_ftrace_function(struct ftrace_ops *ops);
 115void clear_ftrace_function(void);
 116
 117/**
 118 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
 119 *
 120 * This function enables tracing on current cpu by decreasing
 121 * the per cpu control variable.
 122 * It must be called with preemption disabled and only on ftrace_ops
 123 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
 124 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
 125 */
 126static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
 127{
 128        if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
 129                return;
 130
 131        (*this_cpu_ptr(ops->disabled))--;
 132}
 133
 134/**
 135 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
 136 *
 137 * This function enables tracing on current cpu by decreasing
 138 * the per cpu control variable.
 139 * It must be called with preemption disabled and only on ftrace_ops
 140 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
 141 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
 142 */
 143static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
 144{
 145        if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
 146                return;
 147
 148        (*this_cpu_ptr(ops->disabled))++;
 149}
 150
 151/**
 152 * ftrace_function_local_disabled - returns ftrace_ops disabled value
 153 *                                  on current cpu
 154 *
 155 * This function returns value of ftrace_ops::disabled on current cpu.
 156 * It must be called with preemption disabled and only on ftrace_ops
 157 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
 158 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
 159 */
 160static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
 161{
 162        WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
 163        return *this_cpu_ptr(ops->disabled);
 164}
 165
 166extern void ftrace_stub(unsigned long a0, unsigned long a1);
 167
 168#else /* !CONFIG_FUNCTION_TRACER */
 169/*
 170 * (un)register_ftrace_function must be a macro since the ops parameter
 171 * must not be evaluated.
 172 */
 173#define register_ftrace_function(ops) ({ 0; })
 174#define unregister_ftrace_function(ops) ({ 0; })
 175static inline void clear_ftrace_function(void) { }
 176static inline void ftrace_kill(void) { }
 177static inline void ftrace_stop(void) { }
 178static inline void ftrace_start(void) { }
 179#endif /* CONFIG_FUNCTION_TRACER */
 180
 181#ifdef CONFIG_STACK_TRACER
 182extern int stack_tracer_enabled;
 183int
 184stack_trace_sysctl(struct ctl_table *table, int write,
 185                   void __user *buffer, size_t *lenp,
 186                   loff_t *ppos);
 187#endif
 188
 189struct ftrace_func_command {
 190        struct list_head        list;
 191        char                    *name;
 192        int                     (*func)(struct ftrace_hash *hash,
 193                                        char *func, char *cmd,
 194                                        char *params, int enable);
 195};
 196
 197#ifdef CONFIG_DYNAMIC_FTRACE
 198
 199int ftrace_arch_code_modify_prepare(void);
 200int ftrace_arch_code_modify_post_process(void);
 201
 202void ftrace_bug(int err, unsigned long ip);
 203
 204struct seq_file;
 205
 206struct ftrace_probe_ops {
 207        void                    (*func)(unsigned long ip,
 208                                        unsigned long parent_ip,
 209                                        void **data);
 210        int                     (*callback)(unsigned long ip, void **data);
 211        void                    (*free)(void **data);
 212        int                     (*print)(struct seq_file *m,
 213                                         unsigned long ip,
 214                                         struct ftrace_probe_ops *ops,
 215                                         void *data);
 216};
 217
 218extern int
 219register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
 220                              void *data);
 221extern void
 222unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
 223                                void *data);
 224extern void
 225unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
 226extern void unregister_ftrace_function_probe_all(char *glob);
 227
 228extern int ftrace_text_reserved(void *start, void *end);
 229
 230enum {
 231        FTRACE_FL_ENABLED       = (1 << 30),
 232};
 233
 234#define FTRACE_FL_MASK          (0x3UL << 30)
 235#define FTRACE_REF_MAX          ((1 << 30) - 1)
 236
 237struct dyn_ftrace {
 238        union {
 239                unsigned long           ip; /* address of mcount call-site */
 240                struct dyn_ftrace       *freelist;
 241        };
 242        unsigned long           flags;
 243        struct dyn_arch_ftrace          arch;
 244};
 245
 246int ftrace_force_update(void);
 247int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
 248                       int len, int reset);
 249int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
 250                        int len, int reset);
 251void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
 252void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
 253void ftrace_free_filter(struct ftrace_ops *ops);
 254
 255int register_ftrace_command(struct ftrace_func_command *cmd);
 256int unregister_ftrace_command(struct ftrace_func_command *cmd);
 257
 258enum {
 259        FTRACE_UPDATE_CALLS             = (1 << 0),
 260        FTRACE_DISABLE_CALLS            = (1 << 1),
 261        FTRACE_UPDATE_TRACE_FUNC        = (1 << 2),
 262        FTRACE_START_FUNC_RET           = (1 << 3),
 263        FTRACE_STOP_FUNC_RET            = (1 << 4),
 264};
 265
 266enum {
 267        FTRACE_UPDATE_IGNORE,
 268        FTRACE_UPDATE_MAKE_CALL,
 269        FTRACE_UPDATE_MAKE_NOP,
 270};
 271
 272enum {
 273        FTRACE_ITER_FILTER      = (1 << 0),
 274        FTRACE_ITER_NOTRACE     = (1 << 1),
 275        FTRACE_ITER_PRINTALL    = (1 << 2),
 276        FTRACE_ITER_DO_HASH     = (1 << 3),
 277        FTRACE_ITER_HASH        = (1 << 4),
 278        FTRACE_ITER_ENABLED     = (1 << 5),
 279};
 280
 281void arch_ftrace_update_code(int command);
 282
 283struct ftrace_rec_iter;
 284
 285struct ftrace_rec_iter *ftrace_rec_iter_start(void);
 286struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
 287struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
 288
 289#define for_ftrace_rec_iter(iter)               \
 290        for (iter = ftrace_rec_iter_start();    \
 291             iter;                              \
 292             iter = ftrace_rec_iter_next(iter))
 293
 294
 295int ftrace_update_record(struct dyn_ftrace *rec, int enable);
 296int ftrace_test_record(struct dyn_ftrace *rec, int enable);
 297void ftrace_run_stop_machine(int command);
 298unsigned long ftrace_location(unsigned long ip);
 299
 300extern ftrace_func_t ftrace_trace_function;
 301
 302int ftrace_regex_open(struct ftrace_ops *ops, int flag,
 303                  struct inode *inode, struct file *file);
 304ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
 305                            size_t cnt, loff_t *ppos);
 306ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
 307                             size_t cnt, loff_t *ppos);
 308loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin);
 309int ftrace_regex_release(struct inode *inode, struct file *file);
 310
 311void __init
 312ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
 313
 314/* defined in arch */
 315extern int ftrace_ip_converted(unsigned long ip);
 316extern int ftrace_dyn_arch_init(void *data);
 317extern void ftrace_replace_code(int enable);
 318extern int ftrace_update_ftrace_func(ftrace_func_t func);
 319extern void ftrace_caller(void);
 320extern void ftrace_call(void);
 321extern void mcount_call(void);
 322
 323void ftrace_modify_all_code(int command);
 324
 325#ifndef FTRACE_ADDR
 326#define FTRACE_ADDR ((unsigned long)ftrace_caller)
 327#endif
 328#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 329extern void ftrace_graph_caller(void);
 330extern int ftrace_enable_ftrace_graph_caller(void);
 331extern int ftrace_disable_ftrace_graph_caller(void);
 332#else
 333static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
 334static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
 335#endif
 336
 337/**
 338 * ftrace_make_nop - convert code into nop
 339 * @mod: module structure if called by module load initialization
 340 * @rec: the mcount call site record
 341 * @addr: the address that the call site should be calling
 342 *
 343 * This is a very sensitive operation and great care needs
 344 * to be taken by the arch.  The operation should carefully
 345 * read the location, check to see if what is read is indeed
 346 * what we expect it to be, and then on success of the compare,
 347 * it should write to the location.
 348 *
 349 * The code segment at @rec->ip should be a caller to @addr
 350 *
 351 * Return must be:
 352 *  0 on success
 353 *  -EFAULT on error reading the location
 354 *  -EINVAL on a failed compare of the contents
 355 *  -EPERM  on error writing to the location
 356 * Any other value will be considered a failure.
 357 */
 358extern int ftrace_make_nop(struct module *mod,
 359                           struct dyn_ftrace *rec, unsigned long addr);
 360
 361/**
 362 * ftrace_make_call - convert a nop call site into a call to addr
 363 * @rec: the mcount call site record
 364 * @addr: the address that the call site should call
 365 *
 366 * This is a very sensitive operation and great care needs
 367 * to be taken by the arch.  The operation should carefully
 368 * read the location, check to see if what is read is indeed
 369 * what we expect it to be, and then on success of the compare,
 370 * it should write to the location.
 371 *
 372 * The code segment at @rec->ip should be a nop
 373 *
 374 * Return must be:
 375 *  0 on success
 376 *  -EFAULT on error reading the location
 377 *  -EINVAL on a failed compare of the contents
 378 *  -EPERM  on error writing to the location
 379 * Any other value will be considered a failure.
 380 */
 381extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
 382
 383/* May be defined in arch */
 384extern int ftrace_arch_read_dyn_info(char *buf, int size);
 385
 386extern int skip_trace(unsigned long ip);
 387
 388extern void ftrace_disable_daemon(void);
 389extern void ftrace_enable_daemon(void);
 390#else
 391static inline int skip_trace(unsigned long ip) { return 0; }
 392static inline int ftrace_force_update(void) { return 0; }
 393static inline void ftrace_disable_daemon(void) { }
 394static inline void ftrace_enable_daemon(void) { }
 395static inline void ftrace_release_mod(struct module *mod) {}
 396static inline int register_ftrace_command(struct ftrace_func_command *cmd)
 397{
 398        return -EINVAL;
 399}
 400static inline int unregister_ftrace_command(char *cmd_name)
 401{
 402        return -EINVAL;
 403}
 404static inline int ftrace_text_reserved(void *start, void *end)
 405{
 406        return 0;
 407}
 408
 409/*
 410 * Again users of functions that have ftrace_ops may not
 411 * have them defined when ftrace is not enabled, but these
 412 * functions may still be called. Use a macro instead of inline.
 413 */
 414#define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
 415#define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
 416#define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
 417#define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
 418#define ftrace_free_filter(ops) do { } while (0)
 419
 420static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
 421                            size_t cnt, loff_t *ppos) { return -ENODEV; }
 422static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
 423                             size_t cnt, loff_t *ppos) { return -ENODEV; }
 424static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
 425{
 426        return -ENODEV;
 427}
 428static inline int
 429ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
 430#endif /* CONFIG_DYNAMIC_FTRACE */
 431
 432/* totally disable ftrace - can not re-enable after this */
 433void ftrace_kill(void);
 434
 435static inline void tracer_disable(void)
 436{
 437#ifdef CONFIG_FUNCTION_TRACER
 438        ftrace_enabled = 0;
 439#endif
 440}
 441
 442/*
 443 * Ftrace disable/restore without lock. Some synchronization mechanism
 444 * must be used to prevent ftrace_enabled to be changed between
 445 * disable/restore.
 446 */
 447static inline int __ftrace_enabled_save(void)
 448{
 449#ifdef CONFIG_FUNCTION_TRACER
 450        int saved_ftrace_enabled = ftrace_enabled;
 451        ftrace_enabled = 0;
 452        return saved_ftrace_enabled;
 453#else
 454        return 0;
 455#endif
 456}
 457
 458static inline void __ftrace_enabled_restore(int enabled)
 459{
 460#ifdef CONFIG_FUNCTION_TRACER
 461        ftrace_enabled = enabled;
 462#endif
 463}
 464
 465#ifndef HAVE_ARCH_CALLER_ADDR
 466# ifdef CONFIG_FRAME_POINTER
 467#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
 468#  define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
 469#  define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
 470#  define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
 471#  define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
 472#  define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
 473#  define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
 474# else
 475#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
 476#  define CALLER_ADDR1 0UL
 477#  define CALLER_ADDR2 0UL
 478#  define CALLER_ADDR3 0UL
 479#  define CALLER_ADDR4 0UL
 480#  define CALLER_ADDR5 0UL
 481#  define CALLER_ADDR6 0UL
 482# endif
 483#endif /* ifndef HAVE_ARCH_CALLER_ADDR */
 484
 485#ifdef CONFIG_IRQSOFF_TRACER
 486  extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
 487  extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
 488#else
 489  static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
 490  static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
 491#endif
 492
 493#ifdef CONFIG_PREEMPT_TRACER
 494  extern void trace_preempt_on(unsigned long a0, unsigned long a1);
 495  extern void trace_preempt_off(unsigned long a0, unsigned long a1);
 496#else
 497/*
 498 * Use defines instead of static inlines because some arches will make code out
 499 * of the CALLER_ADDR, when we really want these to be a real nop.
 500 */
 501# define trace_preempt_on(a0, a1) do { } while (0)
 502# define trace_preempt_off(a0, a1) do { } while (0)
 503#endif
 504
 505#ifdef CONFIG_FTRACE_MCOUNT_RECORD
 506extern void ftrace_init(void);
 507#else
 508static inline void ftrace_init(void) { }
 509#endif
 510
 511/*
 512 * Structure that defines an entry function trace.
 513 */
 514struct ftrace_graph_ent {
 515        unsigned long func; /* Current function */
 516        int depth;
 517};
 518
 519/*
 520 * Structure that defines a return function trace.
 521 */
 522struct ftrace_graph_ret {
 523        unsigned long func; /* Current function */
 524        unsigned long long calltime;
 525        unsigned long long rettime;
 526        /* Number of functions that overran the depth limit for current task */
 527        unsigned long overrun;
 528        int depth;
 529};
 530
 531/* Type of the callback handlers for tracing function graph*/
 532typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
 533typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
 534
 535#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 536
 537/* for init task */
 538#define INIT_FTRACE_GRAPH               .ret_stack = NULL,
 539
 540/*
 541 * Stack of return addresses for functions
 542 * of a thread.
 543 * Used in struct thread_info
 544 */
 545struct ftrace_ret_stack {
 546        unsigned long ret;
 547        unsigned long func;
 548        unsigned long long calltime;
 549        unsigned long long subtime;
 550        unsigned long fp;
 551};
 552
 553/*
 554 * Primary handler of a function return.
 555 * It relays on ftrace_return_to_handler.
 556 * Defined in entry_32/64.S
 557 */
 558extern void return_to_handler(void);
 559
 560extern int
 561ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
 562                         unsigned long frame_pointer);
 563
 564/*
 565 * Sometimes we don't want to trace a function with the function
 566 * graph tracer but we want them to keep traced by the usual function
 567 * tracer if the function graph tracer is not configured.
 568 */
 569#define __notrace_funcgraph             notrace
 570
 571/*
 572 * We want to which function is an entrypoint of a hardirq.
 573 * That will help us to put a signal on output.
 574 */
 575#define __irq_entry              __attribute__((__section__(".irqentry.text")))
 576
 577/* Limits of hardirq entrypoints */
 578extern char __irqentry_text_start[];
 579extern char __irqentry_text_end[];
 580
 581#define FTRACE_RETFUNC_DEPTH 50
 582#define FTRACE_RETSTACK_ALLOC_SIZE 32
 583extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
 584                                trace_func_graph_ent_t entryfunc);
 585
 586extern void ftrace_graph_stop(void);
 587
 588/* The current handlers in use */
 589extern trace_func_graph_ret_t ftrace_graph_return;
 590extern trace_func_graph_ent_t ftrace_graph_entry;
 591
 592extern void unregister_ftrace_graph(void);
 593
 594extern void ftrace_graph_init_task(struct task_struct *t);
 595extern void ftrace_graph_exit_task(struct task_struct *t);
 596extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
 597
 598static inline int task_curr_ret_stack(struct task_struct *t)
 599{
 600        return t->curr_ret_stack;
 601}
 602
 603static inline void pause_graph_tracing(void)
 604{
 605        atomic_inc(&current->tracing_graph_pause);
 606}
 607
 608static inline void unpause_graph_tracing(void)
 609{
 610        atomic_dec(&current->tracing_graph_pause);
 611}
 612#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
 613
 614#define __notrace_funcgraph
 615#define __irq_entry
 616#define INIT_FTRACE_GRAPH
 617
 618static inline void ftrace_graph_init_task(struct task_struct *t) { }
 619static inline void ftrace_graph_exit_task(struct task_struct *t) { }
 620static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
 621
 622static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
 623                          trace_func_graph_ent_t entryfunc)
 624{
 625        return -1;
 626}
 627static inline void unregister_ftrace_graph(void) { }
 628
 629static inline int task_curr_ret_stack(struct task_struct *tsk)
 630{
 631        return -1;
 632}
 633
 634static inline void pause_graph_tracing(void) { }
 635static inline void unpause_graph_tracing(void) { }
 636#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 637
 638#ifdef CONFIG_TRACING
 639
 640/* flags for current->trace */
 641enum {
 642        TSK_TRACE_FL_TRACE_BIT  = 0,
 643        TSK_TRACE_FL_GRAPH_BIT  = 1,
 644};
 645enum {
 646        TSK_TRACE_FL_TRACE      = 1 << TSK_TRACE_FL_TRACE_BIT,
 647        TSK_TRACE_FL_GRAPH      = 1 << TSK_TRACE_FL_GRAPH_BIT,
 648};
 649
 650static inline void set_tsk_trace_trace(struct task_struct *tsk)
 651{
 652        set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
 653}
 654
 655static inline void clear_tsk_trace_trace(struct task_struct *tsk)
 656{
 657        clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
 658}
 659
 660static inline int test_tsk_trace_trace(struct task_struct *tsk)
 661{
 662        return tsk->trace & TSK_TRACE_FL_TRACE;
 663}
 664
 665static inline void set_tsk_trace_graph(struct task_struct *tsk)
 666{
 667        set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
 668}
 669
 670static inline void clear_tsk_trace_graph(struct task_struct *tsk)
 671{
 672        clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
 673}
 674
 675static inline int test_tsk_trace_graph(struct task_struct *tsk)
 676{
 677        return tsk->trace & TSK_TRACE_FL_GRAPH;
 678}
 679
 680enum ftrace_dump_mode;
 681
 682extern enum ftrace_dump_mode ftrace_dump_on_oops;
 683
 684#ifdef CONFIG_PREEMPT
 685#define INIT_TRACE_RECURSION            .trace_recursion = 0,
 686#endif
 687
 688#endif /* CONFIG_TRACING */
 689
 690#ifndef INIT_TRACE_RECURSION
 691#define INIT_TRACE_RECURSION
 692#endif
 693
 694#ifdef CONFIG_FTRACE_SYSCALLS
 695
 696unsigned long arch_syscall_addr(int nr);
 697
 698#endif /* CONFIG_FTRACE_SYSCALLS */
 699
 700#endif /* _LINUX_FTRACE_H */
 701
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