include/linux/module.h

   1 #ifndef _LINUX_MODULE_H
   2 #define _LINUX_MODULE_H
   3 /*
   4  * Dynamic loading of modules into the kernel.
   5  *
   6  * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
   7  * Rewritten again by Rusty Russell, 2002
   8  */
   9 #include <linux/list.h>
  10 #include <linux/stat.h>
  11 #include <linux/compiler.h>
  12 #include <linux/cache.h>
  13 #include <linux/kmod.h>
  14 #include <linux/elf.h>
  15 #include <linux/stringify.h>
  16 #include <linux/kobject.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/tracepoint.h>
  19
  20 #include <linux/percpu.h>
  21 #include <asm/module.h>
  22
  23 #include <trace/events/module.h>
  24
  25 /* Not Yet Implemented */
  26 #define MODULE_SUPPORTED_DEVICE(name)
  27
  28 /* Some toolchains use a `_' prefix for all user symbols. */
  29 #ifdef CONFIG_SYMBOL_PREFIX
  30 #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
  31 #else
  32 #define MODULE_SYMBOL_PREFIX ""
  33 #endif
  34
  35 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  36
  37 struct kernel_symbol
  38 {
  39         unsigned long value;
  40         const char *name;
  41 };
  42
  43 struct modversion_info
  44 {
  45         unsigned long crc;
  46         char name[MODULE_NAME_LEN];
  47 };
  48
  49 struct module;
  50
  51 struct module_attribute {
  52         struct attribute attr;
  53         ssize_t (*show)(struct module_attribute *, struct module *, char *);
  54         ssize_t (*store)(struct module_attribute *, struct module *,
  55                          const char *, size_t count);
  56         void (*setup)(struct module *, const char *);
  57         int (*test)(struct module *);
  58         void (*free)(struct module *);
  59 };
  60
  61 struct module_version_attribute {
  62         struct module_attribute mattr;
  63         const char *module_name;
  64         const char *version;
  65 };
  66
  67 struct module_kobject
  68 {
  69         struct kobject kobj;
  70         struct module *mod;
  71         struct kobject *drivers_dir;
  72         struct module_param_attrs *mp;
  73 };
  74
  75 /* These are either module local, or the kernel's dummy ones. */
  76 extern int init_module(void);
  77 extern void cleanup_module(void);
  78
  79 /* Archs provide a method of finding the correct exception table. */
  80 struct exception_table_entry;
  81
  82 const struct exception_table_entry *
  83 search_extable(const struct exception_table_entry *first,
  84                const struct exception_table_entry *last,
  85                unsigned long value);
  86 void sort_extable(struct exception_table_entry *start,
  87                   struct exception_table_entry *finish);
  88 void sort_main_extable(void);
  89 void trim_init_extable(struct module *m);
  90
  91 #ifdef MODULE
  92 #define MODULE_GENERIC_TABLE(gtype,name)                        \
  93 extern const struct gtype##_id __mod_##gtype##_table            \
  94   __attribute__ ((unused, alias(__stringify(name))))
  95
  96 extern struct module __this_module;
  97 #define THIS_MODULE (&__this_module)
  98 #else  /* !MODULE */
  99 #define MODULE_GENERIC_TABLE(gtype,name)
 100 #define THIS_MODULE ((struct module *)0)
 101 #endif
 102
 103 /* Generic info of form tag = "info" */
 104 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 105
 106 /* For userspace: you can also call me... */
 107 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 108
 109 /*
 110  * The following license idents are currently accepted as indicating free
 111  * software modules
 112  *
 113  *      "GPL"                           [GNU Public License v2 or later]
 114  *      "GPL v2"                        [GNU Public License v2]
 115  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 116  *      "Dual BSD/GPL"                  [GNU Public License v2
 117  *                                       or BSD license choice]
 118  *      "Dual MIT/GPL"                  [GNU Public License v2
 119  *                                       or MIT license choice]
 120  *      "Dual MPL/GPL"                  [GNU Public License v2
 121  *                                       or Mozilla license choice]
 122  *
 123  * The following other idents are available
 124  *
 125  *      "Proprietary"                   [Non free products]
 126  *
 127  * There are dual licensed components, but when running with Linux it is the
 128  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 129  * is a GPL combined work.
 130  *
 131  * This exists for several reasons
 132  * 1.   So modinfo can show license info for users wanting to vet their setup
 133  *      is free
 134  * 2.   So the community can ignore bug reports including proprietary modules
 135  * 3.   So vendors can do likewise based on their own policies
 136  */
 137 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
 138
 139 /*
 140  * Author(s), use "Name <email>" or just "Name", for multiple
 141  * authors use multiple MODULE_AUTHOR() statements/lines.
 142  */
 143 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 144
 145 /* What your module does. */
 146 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 147
 148 /* One for each parameter, describing how to use it.  Some files do
 149    multiple of these per line, so can't just use MODULE_INFO. */
 150 #define MODULE_PARM_DESC(_parm, desc) \
 151         __MODULE_INFO(parm, _parm, #_parm ":" desc)
 152
 153 #define MODULE_DEVICE_TABLE(type,name)          \
 154   MODULE_GENERIC_TABLE(type##_device,name)
 155
 156 /* Version of form [<epoch>:]<version>[-<extra-version>].
 157    Or for CVS/RCS ID version, everything but the number is stripped.
 158   <epoch>: A (small) unsigned integer which allows you to start versions
 159            anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 160            "1:2.0".
 161   <version>: The <version> may contain only alphanumerics and the
 162            character `.'.  Ordered by numeric sort for numeric parts,
 163            ascii sort for ascii parts (as per RPM or DEB algorithm).
 164   <extraversion>: Like <version>, but inserted for local
 165            customizations, eg "rh3" or "rusty1".
 166
 167   Using this automatically adds a checksum of the .c files and the
 168   local headers in "srcversion".
 169 */
 170
 171 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 172 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 173 #else
 174 #define MODULE_VERSION(_version)                                        \
 175         extern ssize_t __modver_version_show(struct module_attribute *, \
 176                                              struct module *, char *);  \
 177         static struct module_version_attribute __modver_version_attr    \
 178         __used                                                          \
 179     __attribute__ ((__section__ ("__modver"),aligned(sizeof(void *)))) \
 180         = {                                                             \
 181                 .mattr  = {                                             \
 182                         .attr   = {                                     \
 183                                 .name   = "version",                    \
 184                                 .mode   = S_IRUGO,                      \
 185                         },                                              \
 186                         .show   = __modver_version_show,                \
 187                 },                                                      \
 188                 .module_name    = KBUILD_MODNAME,                       \
 189                 .version        = _version,                             \
 190         }
 191 #endif
 192
 193 /* Optional firmware file (or files) needed by the module
 194  * format is simply firmware file name.  Multiple firmware
 195  * files require multiple MODULE_FIRMWARE() specifiers */
 196 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 197
 198 /* Given an address, look for it in the exception tables */
 199 const struct exception_table_entry *search_exception_tables(unsigned long add);
 200
 201 struct notifier_block;
 202
 203 #ifdef CONFIG_MODULES
 204
 205 extern int modules_disabled; /* for sysctl */
 206 /* Get/put a kernel symbol (calls must be symmetric) */
 207 void *__symbol_get(const char *symbol);
 208 void *__symbol_get_gpl(const char *symbol);
 209 #define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
 210
 211 /* modules using other modules: kdb wants to see this. */
 212 struct module_use {
 213         struct list_head source_list;
 214         struct list_head target_list;
 215         struct module *source, *target;
 216 };
 217
 218 #ifndef __GENKSYMS__
 219 #ifdef CONFIG_MODVERSIONS
 220 /* Mark the CRC weak since genksyms apparently decides not to
 221  * generate a checksums for some symbols */
 222 #define __CRC_SYMBOL(sym, sec)                                  \
 223         extern void *__crc_##sym __attribute__((weak));         \
 224         static const unsigned long __kcrctab_##sym              \
 225         __used                                                  \
 226         __attribute__((section("__kcrctab" sec), unused))       \
 227         = (unsigned long) &__crc_##sym;
 228 #else
 229 #define __CRC_SYMBOL(sym, sec)
 230 #endif
 231
 232 /* For every exported symbol, place a struct in the __ksymtab section */
 233 #define __EXPORT_SYMBOL(sym, sec)                               \
 234         extern typeof(sym) sym;                                 \
 235         __CRC_SYMBOL(sym, sec)                                  \
 236         static const char __kstrtab_##sym[]                     \
 237         __attribute__((section("__ksymtab_strings"), aligned(1))) \
 238         = MODULE_SYMBOL_PREFIX #sym;                            \
 239         static const struct kernel_symbol __ksymtab_##sym       \
 240         __used                                                  \
 241         __attribute__((section("__ksymtab" sec), unused))       \
 242         = { (unsigned long)&sym, __kstrtab_##sym }
 243
 244 #define EXPORT_SYMBOL(sym)                                      \
 245         __EXPORT_SYMBOL(sym, "")
 246
 247 #define EXPORT_SYMBOL_GPL(sym)                                  \
 248         __EXPORT_SYMBOL(sym, "_gpl")
 249
 250 #define EXPORT_SYMBOL_GPL_FUTURE(sym)                           \
 251         __EXPORT_SYMBOL(sym, "_gpl_future")
 252
 253
 254 #ifdef CONFIG_UNUSED_SYMBOLS
 255 #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
 256 #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
 257 #else
 258 #define EXPORT_UNUSED_SYMBOL(sym)
 259 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
 260 #endif
 261
 262 #endif
 263
 264 enum module_state
 265 {
 266         MODULE_STATE_LIVE,
 267         MODULE_STATE_COMING,
 268         MODULE_STATE_GOING,
 269 };
 270
 271 struct module
 272 {
 273         enum module_state state;
 274
 275         /* Member of list of modules */
 276         struct list_head list;
 277
 278         /* Unique handle for this module */
 279         char name[MODULE_NAME_LEN];
 280
 281         /* Sysfs stuff. */
 282         struct module_kobject mkobj;
 283         struct module_attribute *modinfo_attrs;
 284         const char *version;
 285         const char *srcversion;
 286         struct kobject *holders_dir;
 287
 288         /* Exported symbols */
 289         const struct kernel_symbol *syms;
 290         const unsigned long *crcs;
 291         unsigned int num_syms;
 292
 293         /* Kernel parameters. */
 294         struct kernel_param *kp;
 295         unsigned int num_kp;
 296
 297         /* GPL-only exported symbols. */
 298         unsigned int num_gpl_syms;
 299         const struct kernel_symbol *gpl_syms;
 300         const unsigned long *gpl_crcs;
 301
 302 #ifdef CONFIG_UNUSED_SYMBOLS
 303         /* unused exported symbols. */
 304         const struct kernel_symbol *unused_syms;
 305         const unsigned long *unused_crcs;
 306         unsigned int num_unused_syms;
 307
 308         /* GPL-only, unused exported symbols. */
 309         unsigned int num_unused_gpl_syms;
 310         const struct kernel_symbol *unused_gpl_syms;
 311         const unsigned long *unused_gpl_crcs;
 312 #endif
 313
 314         /* symbols that will be GPL-only in the near future. */
 315         const struct kernel_symbol *gpl_future_syms;
 316         const unsigned long *gpl_future_crcs;
 317         unsigned int num_gpl_future_syms;
 318
 319         /* Exception table */
 320         unsigned int num_exentries;
 321         struct exception_table_entry *extable;
 322
 323         /* Startup function. */
 324         int (*init)(void);
 325
 326         /* If this is non-NULL, vfree after init() returns */
 327         void *module_init;
 328
 329         /* Here is the actual code + data, vfree'd on unload. */
 330         void *module_core;
 331
 332         /* Here are the sizes of the init and core sections */
 333         unsigned int init_size, core_size;
 334
 335         /* The size of the executable code in each section.  */
 336         unsigned int init_text_size, core_text_size;
 337
 338         /* Size of RO sections of the module (text+rodata) */
 339         unsigned int init_ro_size, core_ro_size;
 340
 341         /* Arch-specific module values */
 342         struct mod_arch_specific arch;
 343
 344         unsigned int taints;    /* same bits as kernel:tainted */
 345
 346 #ifdef CONFIG_GENERIC_BUG
 347         /* Support for BUG */
 348         unsigned num_bugs;
 349         struct list_head bug_list;
 350         struct bug_entry *bug_table;
 351 #endif
 352
 353 #ifdef CONFIG_KALLSYMS
 354         /*
 355          * We keep the symbol and string tables for kallsyms.
 356          * The core_* fields below are temporary, loader-only (they
 357          * could really be discarded after module init).
 358          */
 359         Elf_Sym *symtab, *core_symtab;
 360         unsigned int num_symtab, core_num_syms;
 361         char *strtab, *core_strtab;
 362
 363         /* Section attributes */
 364         struct module_sect_attrs *sect_attrs;
 365
 366         /* Notes attributes */
 367         struct module_notes_attrs *notes_attrs;
 368 #endif
 369
 370 #ifdef CONFIG_SMP
 371         /* Per-cpu data. */
 372         void __percpu *percpu;
 373         unsigned int percpu_size;
 374 #endif
 375
 376         /* The command line arguments (may be mangled).  People like
 377            keeping pointers to this stuff */
 378         char *args;
 379 #ifdef CONFIG_TRACEPOINTS
 380         struct tracepoint *tracepoints;
 381         unsigned int num_tracepoints;
 382 #endif
 383 #ifdef HAVE_JUMP_LABEL
 384         struct jump_entry *jump_entries;
 385         unsigned int num_jump_entries;
 386 #endif
 387 #ifdef CONFIG_TRACING
 388         const char **trace_bprintk_fmt_start;
 389         unsigned int num_trace_bprintk_fmt;
 390 #endif
 391 #ifdef CONFIG_EVENT_TRACING
 392         struct ftrace_event_call *trace_events;
 393         unsigned int num_trace_events;
 394 #endif
 395 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 396         unsigned long *ftrace_callsites;
 397         unsigned int num_ftrace_callsites;
 398 #endif
 399
 400 #ifdef CONFIG_MODULE_UNLOAD
 401         /* What modules depend on me? */
 402         struct list_head source_list;
 403         /* What modules do I depend on? */
 404         struct list_head target_list;
 405
 406         /* Who is waiting for us to be unloaded */
 407         struct task_struct *waiter;
 408
 409         /* Destruction function. */
 410         void (*exit)(void);
 411
 412         struct module_ref {
 413                 unsigned int incs;
 414                 unsigned int decs;
 415         } __percpu *refptr;
 416 #endif
 417
 418 #ifdef CONFIG_CONSTRUCTORS
 419         /* Constructor functions. */
 420         ctor_fn_t *ctors;
 421         unsigned int num_ctors;
 422 #endif
 423 };
 424 #ifndef MODULE_ARCH_INIT
 425 #define MODULE_ARCH_INIT {}
 426 #endif
 427
 428 extern struct mutex module_mutex;
 429
 430 /* FIXME: It'd be nice to isolate modules during init, too, so they
 431    aren't used before they (may) fail.  But presently too much code
 432    (IDE & SCSI) require entry into the module during init.*/
 433 static inline int module_is_live(struct module *mod)
 434 {
 435         return mod->state != MODULE_STATE_GOING;
 436 }
 437
 438 struct module *__module_text_address(unsigned long addr);
 439 struct module *__module_address(unsigned long addr);
 440 bool is_module_address(unsigned long addr);
 441 bool is_module_percpu_address(unsigned long addr);
 442 bool is_module_text_address(unsigned long addr);
 443
 444 static inline int within_module_core(unsigned long addr, struct module *mod)
 445 {
 446         return (unsigned long)mod->module_core <= addr &&
 447                addr < (unsigned long)mod->module_core + mod->core_size;
 448 }
 449
 450 static inline int within_module_init(unsigned long addr, struct module *mod)
 451 {
 452         return (unsigned long)mod->module_init <= addr &&
 453                addr < (unsigned long)mod->module_init + mod->init_size;
 454 }
 455
 456 /* Search for module by name: must hold module_mutex. */
 457 struct module *find_module(const char *name);
 458
 459 struct symsearch {
 460         const struct kernel_symbol *start, *stop;
 461         const unsigned long *crcs;
 462         enum {
 463                 NOT_GPL_ONLY,
 464                 GPL_ONLY,
 465                 WILL_BE_GPL_ONLY,
 466         } licence;
 467         bool unused;
 468 };
 469
 470 /* Search for an exported symbol by name. */
 471 const struct kernel_symbol *find_symbol(const char *name,
 472                                         struct module **owner,
 473                                         const unsigned long **crc,
 474                                         bool gplok,
 475                                         bool warn);
 476
 477 /* Walk the exported symbol table */
 478 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
 479                             unsigned int symnum, void *data), void *data);
 480
 481 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 482    symnum out of range. */
 483 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 484                         char *name, char *module_name, int *exported);
 485
 486 /* Look for this name: can be of form module:name. */
 487 unsigned long module_kallsyms_lookup_name(const char *name);
 488
 489 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 490                                              struct module *, unsigned long),
 491                                    void *data);
 492
 493 extern void __module_put_and_exit(struct module *mod, long code)
 494         __attribute__((noreturn));
 495 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
 496
 497 #ifdef CONFIG_MODULE_UNLOAD
 498 unsigned int module_refcount(struct module *mod);
 499 void __symbol_put(const char *symbol);
 500 #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
 501 void symbol_put_addr(void *addr);
 502
 503 /* Sometimes we know we already have a refcount, and it's easier not
 504    to handle the error case (which only happens with rmmod --wait). */
 505 static inline void __module_get(struct module *module)
 506 {
 507         if (module) {
 508                 preempt_disable();
 509                 __this_cpu_inc(module->refptr->incs);
 510                 trace_module_get(module, _THIS_IP_);
 511                 preempt_enable();
 512         }
 513 }
 514
 515 static inline int try_module_get(struct module *module)
 516 {
 517         int ret = 1;
 518
 519         if (module) {
 520                 preempt_disable();
 521
 522                 if (likely(module_is_live(module))) {
 523                         __this_cpu_inc(module->refptr->incs);
 524                         trace_module_get(module, _THIS_IP_);
 525                 } else
 526                         ret = 0;
 527
 528                 preempt_enable();
 529         }
 530         return ret;
 531 }
 532
 533 extern void module_put(struct module *module);
 534
 535 #else /*!CONFIG_MODULE_UNLOAD*/
 536 static inline int try_module_get(struct module *module)
 537 {
 538         return !module || module_is_live(module);
 539 }
 540 static inline void module_put(struct module *module)
 541 {
 542 }
 543 static inline void __module_get(struct module *module)
 544 {
 545 }
 546 #define symbol_put(x) do { } while(0)
 547 #define symbol_put_addr(p) do { } while(0)
 548
 549 #endif /* CONFIG_MODULE_UNLOAD */
 550 int ref_module(struct module *a, struct module *b);
 551
 552 /* This is a #define so the string doesn't get put in every .o file */
 553 #define module_name(mod)                        \
 554 ({                                              \
 555         struct module *__mod = (mod);           \
 556         __mod ? __mod->name : "kernel";         \
 557 })
 558
 559 /* For kallsyms to ask for address resolution.  namebuf should be at
 560  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 561  * found, otherwise NULL. */
 562 const char *module_address_lookup(unsigned long addr,
 563                             unsigned long *symbolsize,
 564                             unsigned long *offset,
 565                             char **modname,
 566                             char *namebuf);
 567 int lookup_module_symbol_name(unsigned long addr, char *symname);
 568 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 569
 570 /* For extable.c to search modules' exception tables. */
 571 const struct exception_table_entry *search_module_extables(unsigned long addr);
 572
 573 int register_module_notifier(struct notifier_block * nb);
 574 int unregister_module_notifier(struct notifier_block * nb);
 575
 576 extern void print_modules(void);
 577
 578 extern void module_update_tracepoints(void);
 579 extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);
 580
 581 #else /* !CONFIG_MODULES... */
 582 #define EXPORT_SYMBOL(sym)
 583 #define EXPORT_SYMBOL_GPL(sym)
 584 #define EXPORT_SYMBOL_GPL_FUTURE(sym)
 585 #define EXPORT_UNUSED_SYMBOL(sym)
 586 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
 587
 588 /* Given an address, look for it in the exception tables. */
 589 static inline const struct exception_table_entry *
 590 search_module_extables(unsigned long addr)
 591 {
 592         return NULL;
 593 }
 594
 595 static inline struct module *__module_address(unsigned long addr)
 596 {
 597         return NULL;
 598 }
 599
 600 static inline struct module *__module_text_address(unsigned long addr)
 601 {
 602         return NULL;
 603 }
 604
 605 static inline bool is_module_address(unsigned long addr)
 606 {
 607         return false;
 608 }
 609
 610 static inline bool is_module_percpu_address(unsigned long addr)
 611 {
 612         return false;
 613 }
 614
 615 static inline bool is_module_text_address(unsigned long addr)
 616 {
 617         return false;
 618 }
 619
 620 /* Get/put a kernel symbol (calls should be symmetric) */
 621 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 622 #define symbol_put(x) do { } while(0)
 623 #define symbol_put_addr(x) do { } while(0)
 624
 625 static inline void __module_get(struct module *module)
 626 {
 627 }
 628
 629 static inline int try_module_get(struct module *module)
 630 {
 631         return 1;
 632 }
 633
 634 static inline void module_put(struct module *module)
 635 {
 636 }
 637
 638 #define module_name(mod) "kernel"
 639
 640 /* For kallsyms to ask for address resolution.  NULL means not found. */
 641 static inline const char *module_address_lookup(unsigned long addr,
 642                                           unsigned long *symbolsize,
 643                                           unsigned long *offset,
 644                                           char **modname,
 645                                           char *namebuf)
 646 {
 647         return NULL;
 648 }
 649
 650 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 651 {
 652         return -ERANGE;
 653 }
 654
 655 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 656 {
 657         return -ERANGE;
 658 }
 659
 660 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 661                                         char *type, char *name,
 662                                         char *module_name, int *exported)
 663 {
 664         return -ERANGE;
 665 }
 666
 667 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 668 {
 669         return 0;
 670 }
 671
 672 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 673                                                            struct module *,
 674                                                            unsigned long),
 675                                                  void *data)
 676 {
 677         return 0;
 678 }
 679
 680 static inline int register_module_notifier(struct notifier_block * nb)
 681 {
 682         /* no events will happen anyway, so this can always succeed */
 683         return 0;
 684 }
 685
 686 static inline int unregister_module_notifier(struct notifier_block * nb)
 687 {
 688         return 0;
 689 }
 690
 691 #define module_put_and_exit(code) do_exit(code)
 692
 693 static inline void print_modules(void)
 694 {
 695 }
 696
 697 static inline void module_update_tracepoints(void)
 698 {
 699 }
 700
 701 static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
 702 {
 703         return 0;
 704 }
 705 #endif /* CONFIG_MODULES */
 706
 707 #ifdef CONFIG_SYSFS
 708 extern struct kset *module_kset;
 709 extern struct kobj_type module_ktype;
 710 extern int module_sysfs_initialized;
 711 #endif /* CONFIG_SYSFS */
 712
 713 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 714
 715 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 716
 717 #define __MODULE_STRING(x) __stringify(x)
 718
 719 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
 720 extern void set_all_modules_text_rw(void);
 721 extern void set_all_modules_text_ro(void);
 722 #else
 723 static inline void set_all_modules_text_rw(void) { }
 724 static inline void set_all_modules_text_ro(void) { }
 725 #endif
 726
 727 #ifdef CONFIG_GENERIC_BUG
 728 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 729                          struct module *);
 730 void module_bug_cleanup(struct module *);
 731
 732 #else   /* !CONFIG_GENERIC_BUG */
 733
 734 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 735                                         const Elf_Shdr *sechdrs,
 736                                         struct module *mod)
 737 {
 738 }
 739 static inline void module_bug_cleanup(struct module *mod) {}
 740 #endif  /* CONFIG_GENERIC_BUG */
 741
 742 #endif /* _LINUX_MODULE_H */