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/init.h>
  15 #include <linux/elf.h>
  16 #include <linux/stringify.h>
  17 #include <linux/kobject.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/jump_label.h>
  20 #include <linux/export.h>
  21 #include <linux/rbtree_latch.h>
  22
  23 #include <linux/percpu.h>
  24 #include <asm/module.h>
  25
  26 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
  27 #define MODULE_SIG_STRING "~Module signature appended~\n"
  28
  29 /* Not Yet Implemented */
  30 #define MODULE_SUPPORTED_DEVICE(name)
  31
  32 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  33
  34 struct modversion_info {
  35         unsigned long crc;
  36         char name[MODULE_NAME_LEN];
  37 };
  38
  39 struct module;
  40 struct exception_table_entry;
  41
  42 struct module_kobject {
  43         struct kobject kobj;
  44         struct module *mod;
  45         struct kobject *drivers_dir;
  46         struct module_param_attrs *mp;
  47         struct completion *kobj_completion;
  48 };
  49
  50 struct module_attribute {
  51         struct attribute attr;
  52         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
  53                         char *);
  54         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
  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 } __attribute__ ((__aligned__(sizeof(void *))));
  66
  67 extern ssize_t __modver_version_show(struct module_attribute *,
  68                                      struct module_kobject *, char *);
  69
  70 extern struct module_attribute module_uevent;
  71
  72 /* These are either module local, or the kernel's dummy ones. */
  73 extern int init_module(void);
  74 extern void cleanup_module(void);
  75
  76 #ifndef MODULE
  77 /**
  78  * module_init() - driver initialization entry point
  79  * @x: function to be run at kernel boot time or module insertion
  80  *
  81  * module_init() will either be called during do_initcalls() (if
  82  * builtin) or at module insertion time (if a module).  There can only
  83  * be one per module.
  84  */
  85 #define module_init(x)  __initcall(x);
  86
  87 /**
  88  * module_exit() - driver exit entry point
  89  * @x: function to be run when driver is removed
  90  *
  91  * module_exit() will wrap the driver clean-up code
  92  * with cleanup_module() when used with rmmod when
  93  * the driver is a module.  If the driver is statically
  94  * compiled into the kernel, module_exit() has no effect.
  95  * There can only be one per module.
  96  */
  97 #define module_exit(x)  __exitcall(x);
  98
  99 #else /* MODULE */
 100
 101 /*
 102  * In most cases loadable modules do not need custom
 103  * initcall levels. There are still some valid cases where
 104  * a driver may be needed early if built in, and does not
 105  * matter when built as a loadable module. Like bus
 106  * snooping debug drivers.
 107  */
 108 #define early_initcall(fn)              module_init(fn)
 109 #define core_initcall(fn)               module_init(fn)
 110 #define core_initcall_sync(fn)          module_init(fn)
 111 #define postcore_initcall(fn)           module_init(fn)
 112 #define postcore_initcall_sync(fn)      module_init(fn)
 113 #define arch_initcall(fn)               module_init(fn)
 114 #define subsys_initcall(fn)             module_init(fn)
 115 #define subsys_initcall_sync(fn)        module_init(fn)
 116 #define fs_initcall(fn)                 module_init(fn)
 117 #define fs_initcall_sync(fn)            module_init(fn)
 118 #define rootfs_initcall(fn)             module_init(fn)
 119 #define device_initcall(fn)             module_init(fn)
 120 #define device_initcall_sync(fn)        module_init(fn)
 121 #define late_initcall(fn)               module_init(fn)
 122 #define late_initcall_sync(fn)          module_init(fn)
 123
 124 #define console_initcall(fn)            module_init(fn)
 125 #define security_initcall(fn)           module_init(fn)
 126
 127 /* Each module must use one module_init(). */
 128 #define module_init(initfn)                                     \
 129         static inline initcall_t __maybe_unused __inittest(void)                \
 130         { return initfn; }                                      \
 131         int init_module(void) __attribute__((alias(#initfn)));
 132
 133 /* This is only required if you want to be unloadable. */
 134 #define module_exit(exitfn)                                     \
 135         static inline exitcall_t __maybe_unused __exittest(void)                \
 136         { return exitfn; }                                      \
 137         void cleanup_module(void) __attribute__((alias(#exitfn)));
 138
 139 #endif
 140
 141 /* This means "can be init if no module support, otherwise module load
 142    may call it." */
 143 #ifdef CONFIG_MODULES
 144 #define __init_or_module
 145 #define __initdata_or_module
 146 #define __initconst_or_module
 147 #define __INIT_OR_MODULE        .text
 148 #define __INITDATA_OR_MODULE    .data
 149 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
 150 #else
 151 #define __init_or_module __init
 152 #define __initdata_or_module __initdata
 153 #define __initconst_or_module __initconst
 154 #define __INIT_OR_MODULE __INIT
 155 #define __INITDATA_OR_MODULE __INITDATA
 156 #define __INITRODATA_OR_MODULE __INITRODATA
 157 #endif /*CONFIG_MODULES*/
 158
 159 /* Generic info of form tag = "info" */
 160 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 161
 162 /* For userspace: you can also call me... */
 163 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 164
 165 /* Soft module dependencies. See man modprobe.d for details.
 166  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 167  */
 168 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 169
 170 /*
 171  * The following license idents are currently accepted as indicating free
 172  * software modules
 173  *
 174  *      "GPL"                           [GNU Public License v2 or later]
 175  *      "GPL v2"                        [GNU Public License v2]
 176  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 177  *      "Dual BSD/GPL"                  [GNU Public License v2
 178  *                                       or BSD license choice]
 179  *      "Dual MIT/GPL"                  [GNU Public License v2
 180  *                                       or MIT license choice]
 181  *      "Dual MPL/GPL"                  [GNU Public License v2
 182  *                                       or Mozilla license choice]
 183  *
 184  * The following other idents are available
 185  *
 186  *      "Proprietary"                   [Non free products]
 187  *
 188  * There are dual licensed components, but when running with Linux it is the
 189  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 190  * is a GPL combined work.
 191  *
 192  * This exists for several reasons
 193  * 1.   So modinfo can show license info for users wanting to vet their setup
 194  *      is free
 195  * 2.   So the community can ignore bug reports including proprietary modules
 196  * 3.   So vendors can do likewise based on their own policies
 197  */
 198 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
 199
 200 /*
 201  * Author(s), use "Name <email>" or just "Name", for multiple
 202  * authors use multiple MODULE_AUTHOR() statements/lines.
 203  */
 204 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 205
 206 /* What your module does. */
 207 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 208
 209 #ifdef MODULE
 210 /* Creates an alias so file2alias.c can find device table. */
 211 #define MODULE_DEVICE_TABLE(type, name)                                 \
 212 extern const typeof(name) __mod_##type##__##name##_device_table         \
 213   __attribute__ ((unused, alias(__stringify(name))))
 214 #else  /* !MODULE */
 215 #define MODULE_DEVICE_TABLE(type, name)
 216 #endif
 217
 218 /* Version of form [<epoch>:]<version>[-<extra-version>].
 219  * Or for CVS/RCS ID version, everything but the number is stripped.
 220  * <epoch>: A (small) unsigned integer which allows you to start versions
 221  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 222  * "1:2.0".
 223
 224  * <version>: The <version> may contain only alphanumerics and the
 225  * character `.'.  Ordered by numeric sort for numeric parts,
 226  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 227
 228  * <extraversion>: Like <version>, but inserted for local
 229  * customizations, eg "rh3" or "rusty1".
 230
 231  * Using this automatically adds a checksum of the .c files and the
 232  * local headers in "srcversion".
 233  */
 234
 235 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 236 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 237 #else
 238 #define MODULE_VERSION(_version)                                        \
 239         static struct module_version_attribute ___modver_attr = {       \
 240                 .mattr  = {                                             \
 241                         .attr   = {                                     \
 242                                 .name   = "version",                    \
 243                                 .mode   = S_IRUGO,                      \
 244                         },                                              \
 245                         .show   = __modver_version_show,                \
 246                 },                                                      \
 247                 .module_name    = KBUILD_MODNAME,                       \
 248                 .version        = _version,                             \
 249         };                                                              \
 250         static const struct module_version_attribute                    \
 251         __used __attribute__ ((__section__ ("__modver")))               \
 252         * __moduleparam_const __modver_attr = &___modver_attr
 253 #endif
 254
 255 /* Optional firmware file (or files) needed by the module
 256  * format is simply firmware file name.  Multiple firmware
 257  * files require multiple MODULE_FIRMWARE() specifiers */
 258 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 259
 260 struct notifier_block;
 261
 262 #ifdef CONFIG_MODULES
 263
 264 extern int modules_disabled; /* for sysctl */
 265 /* Get/put a kernel symbol (calls must be symmetric) */
 266 void *__symbol_get(const char *symbol);
 267 void *__symbol_get_gpl(const char *symbol);
 268 #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x))))
 269
 270 /* modules using other modules: kdb wants to see this. */
 271 struct module_use {
 272         struct list_head source_list;
 273         struct list_head target_list;
 274         struct module *source, *target;
 275 };
 276
 277 enum module_state {
 278         MODULE_STATE_LIVE,      /* Normal state. */
 279         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 280         MODULE_STATE_GOING,     /* Going away. */
 281         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 282 };
 283
 284 struct mod_tree_node {
 285         struct module *mod;
 286         struct latch_tree_node node;
 287 };
 288
 289 struct module_layout {
 290         /* The actual code + data. */
 291         void *base;
 292         /* Total size. */
 293         unsigned int size;
 294         /* The size of the executable code.  */
 295         unsigned int text_size;
 296         /* Size of RO section of the module (text+rodata) */
 297         unsigned int ro_size;
 298         /* Size of RO after init section */
 299         unsigned int ro_after_init_size;
 300
 301 #ifdef CONFIG_MODULES_TREE_LOOKUP
 302         struct mod_tree_node mtn;
 303 #endif
 304 };
 305
 306 #ifdef CONFIG_MODULES_TREE_LOOKUP
 307 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 308 #define __module_layout_align ____cacheline_aligned
 309 #else
 310 #define __module_layout_align
 311 #endif
 312
 313 struct mod_kallsyms {
 314         Elf_Sym *symtab;
 315         unsigned int num_symtab;
 316         char *strtab;
 317 };
 318
 319 #ifdef CONFIG_LIVEPATCH
 320 struct klp_modinfo {
 321         Elf_Ehdr hdr;
 322         Elf_Shdr *sechdrs;
 323         char *secstrings;
 324         unsigned int symndx;
 325 };
 326 #endif
 327
 328 struct module {
 329         enum module_state state;
 330
 331         /* Member of list of modules */
 332         struct list_head list;
 333
 334         /* Unique handle for this module */
 335         char name[MODULE_NAME_LEN];
 336
 337         /* Sysfs stuff. */
 338         struct module_kobject mkobj;
 339         struct module_attribute *modinfo_attrs;
 340         const char *version;
 341         const char *srcversion;
 342         struct kobject *holders_dir;
 343
 344         /* Exported symbols */
 345         const struct kernel_symbol *syms;
 346         const s32 *crcs;
 347         unsigned int num_syms;
 348
 349         /* Kernel parameters. */
 350 #ifdef CONFIG_SYSFS
 351         struct mutex param_lock;
 352 #endif
 353         struct kernel_param *kp;
 354         unsigned int num_kp;
 355
 356         /* GPL-only exported symbols. */
 357         unsigned int num_gpl_syms;
 358         const struct kernel_symbol *gpl_syms;
 359         const s32 *gpl_crcs;
 360
 361 #ifdef CONFIG_UNUSED_SYMBOLS
 362         /* unused exported symbols. */
 363         const struct kernel_symbol *unused_syms;
 364         const s32 *unused_crcs;
 365         unsigned int num_unused_syms;
 366
 367         /* GPL-only, unused exported symbols. */
 368         unsigned int num_unused_gpl_syms;
 369         const struct kernel_symbol *unused_gpl_syms;
 370         const s32 *unused_gpl_crcs;
 371 #endif
 372
 373 #ifdef CONFIG_MODULE_SIG
 374         /* Signature was verified. */
 375         bool sig_ok;
 376 #endif
 377
 378         bool async_probe_requested;
 379
 380         /* symbols that will be GPL-only in the near future. */
 381         const struct kernel_symbol *gpl_future_syms;
 382         const s32 *gpl_future_crcs;
 383         unsigned int num_gpl_future_syms;
 384
 385         /* Exception table */
 386         unsigned int num_exentries;
 387         struct exception_table_entry *extable;
 388
 389         /* Startup function. */
 390         int (*init)(void);
 391
 392         /* Core layout: rbtree is accessed frequently, so keep together. */
 393         struct module_layout core_layout __module_layout_align;
 394         struct module_layout init_layout;
 395
 396         /* Arch-specific module values */
 397         struct mod_arch_specific arch;
 398
 399         unsigned long taints;   /* same bits as kernel:taint_flags */
 400
 401 #ifdef CONFIG_GENERIC_BUG
 402         /* Support for BUG */
 403         unsigned num_bugs;
 404         struct list_head bug_list;
 405         struct bug_entry *bug_table;
 406 #endif
 407
 408 #ifdef CONFIG_KALLSYMS
 409         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 410         struct mod_kallsyms *kallsyms;
 411         struct mod_kallsyms core_kallsyms;
 412
 413         /* Section attributes */
 414         struct module_sect_attrs *sect_attrs;
 415
 416         /* Notes attributes */
 417         struct module_notes_attrs *notes_attrs;
 418 #endif
 419
 420         /* The command line arguments (may be mangled).  People like
 421            keeping pointers to this stuff */
 422         char *args;
 423
 424 #ifdef CONFIG_SMP
 425         /* Per-cpu data. */
 426         void __percpu *percpu;
 427         unsigned int percpu_size;
 428 #endif
 429
 430 #ifdef CONFIG_TRACEPOINTS
 431         unsigned int num_tracepoints;
 432         struct tracepoint * const *tracepoints_ptrs;
 433 #endif
 434 #ifdef HAVE_JUMP_LABEL
 435         struct jump_entry *jump_entries;
 436         unsigned int num_jump_entries;
 437 #endif
 438 #ifdef CONFIG_TRACING
 439         unsigned int num_trace_bprintk_fmt;
 440         const char **trace_bprintk_fmt_start;
 441 #endif
 442 #ifdef CONFIG_EVENT_TRACING
 443         struct trace_event_call **trace_events;
 444         unsigned int num_trace_events;
 445         struct trace_eval_map **trace_evals;
 446         unsigned int num_trace_evals;
 447 #endif
 448 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 449         unsigned int num_ftrace_callsites;
 450         unsigned long *ftrace_callsites;
 451 #endif
 452
 453 #ifdef CONFIG_LIVEPATCH
 454         bool klp; /* Is this a livepatch module? */
 455         bool klp_alive;
 456
 457         /* Elf information */
 458         struct klp_modinfo *klp_info;
 459 #endif
 460
 461 #ifdef CONFIG_MODULE_UNLOAD
 462         /* What modules depend on me? */
 463         struct list_head source_list;
 464         /* What modules do I depend on? */
 465         struct list_head target_list;
 466
 467         /* Destruction function. */
 468         void (*exit)(void);
 469
 470         atomic_t refcnt;
 471 #endif
 472
 473 #ifdef CONFIG_CONSTRUCTORS
 474         /* Constructor functions. */
 475         ctor_fn_t *ctors;
 476         unsigned int num_ctors;
 477 #endif
 478 } ____cacheline_aligned;
 479 #ifndef MODULE_ARCH_INIT
 480 #define MODULE_ARCH_INIT {}
 481 #endif
 482
 483 extern struct mutex module_mutex;
 484
 485 /* FIXME: It'd be nice to isolate modules during init, too, so they
 486    aren't used before they (may) fail.  But presently too much code
 487    (IDE & SCSI) require entry into the module during init.*/
 488 static inline int module_is_live(struct module *mod)
 489 {
 490         return mod->state != MODULE_STATE_GOING;
 491 }
 492
 493 struct module *__module_text_address(unsigned long addr);
 494 struct module *__module_address(unsigned long addr);
 495 bool is_module_address(unsigned long addr);
 496 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 497 bool is_module_percpu_address(unsigned long addr);
 498 bool is_module_text_address(unsigned long addr);
 499
 500 static inline bool within_module_core(unsigned long addr,
 501                                       const struct module *mod)
 502 {
 503         return (unsigned long)mod->core_layout.base <= addr &&
 504                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 505 }
 506
 507 static inline bool within_module_init(unsigned long addr,
 508                                       const struct module *mod)
 509 {
 510         return (unsigned long)mod->init_layout.base <= addr &&
 511                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 512 }
 513
 514 static inline bool within_module(unsigned long addr, const struct module *mod)
 515 {
 516         return within_module_init(addr, mod) || within_module_core(addr, mod);
 517 }
 518
 519 /* Search for module by name: must hold module_mutex. */
 520 struct module *find_module(const char *name);
 521
 522 struct symsearch {
 523         const struct kernel_symbol *start, *stop;
 524         const s32 *crcs;
 525         enum {
 526                 NOT_GPL_ONLY,
 527                 GPL_ONLY,
 528                 WILL_BE_GPL_ONLY,
 529         } licence;
 530         bool unused;
 531 };
 532
 533 /*
 534  * Search for an exported symbol by name.
 535  *
 536  * Must be called with module_mutex held or preemption disabled.
 537  */
 538 const struct kernel_symbol *find_symbol(const char *name,
 539                                         struct module **owner,
 540                                         const s32 **crc,
 541                                         bool gplok,
 542                                         bool warn);
 543
 544 /*
 545  * Walk the exported symbol table
 546  *
 547  * Must be called with module_mutex held or preemption disabled.
 548  */
 549 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 550                                     struct module *owner,
 551                                     void *data), void *data);
 552
 553 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 554    symnum out of range. */
 555 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 556                         char *name, char *module_name, int *exported);
 557
 558 /* Look for this name: can be of form module:name. */
 559 unsigned long module_kallsyms_lookup_name(const char *name);
 560
 561 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 562                                              struct module *, unsigned long),
 563                                    void *data);
 564
 565 extern void __noreturn __module_put_and_exit(struct module *mod,
 566                         long code);
 567 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 568
 569 #ifdef CONFIG_MODULE_UNLOAD
 570 int module_refcount(struct module *mod);
 571 void __symbol_put(const char *symbol);
 572 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
 573 void symbol_put_addr(void *addr);
 574
 575 /* Sometimes we know we already have a refcount, and it's easier not
 576    to handle the error case (which only happens with rmmod --wait). */
 577 extern void __module_get(struct module *module);
 578
 579 /* This is the Right Way to get a module: if it fails, it's being removed,
 580  * so pretend it's not there. */
 581 extern bool try_module_get(struct module *module);
 582
 583 extern void module_put(struct module *module);
 584
 585 #else /*!CONFIG_MODULE_UNLOAD*/
 586 static inline bool try_module_get(struct module *module)
 587 {
 588         return !module || module_is_live(module);
 589 }
 590 static inline void module_put(struct module *module)
 591 {
 592 }
 593 static inline void __module_get(struct module *module)
 594 {
 595 }
 596 #define symbol_put(x) do { } while (0)
 597 #define symbol_put_addr(p) do { } while (0)
 598
 599 #endif /* CONFIG_MODULE_UNLOAD */
 600 int ref_module(struct module *a, struct module *b);
 601
 602 /* This is a #define so the string doesn't get put in every .o file */
 603 #define module_name(mod)                        \
 604 ({                                              \
 605         struct module *__mod = (mod);           \
 606         __mod ? __mod->name : "kernel";         \
 607 })
 608
 609 /* For kallsyms to ask for address resolution.  namebuf should be at
 610  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 611  * found, otherwise NULL. */
 612 const char *module_address_lookup(unsigned long addr,
 613                             unsigned long *symbolsize,
 614                             unsigned long *offset,
 615                             char **modname,
 616                             char *namebuf);
 617 int lookup_module_symbol_name(unsigned long addr, char *symname);
 618 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 619
 620 int register_module_notifier(struct notifier_block *nb);
 621 int unregister_module_notifier(struct notifier_block *nb);
 622
 623 extern void print_modules(void);
 624
 625 static inline bool module_requested_async_probing(struct module *module)
 626 {
 627         return module && module->async_probe_requested;
 628 }
 629
 630 #ifdef CONFIG_LIVEPATCH
 631 static inline bool is_livepatch_module(struct module *mod)
 632 {
 633         return mod->klp;
 634 }
 635 #else /* !CONFIG_LIVEPATCH */
 636 static inline bool is_livepatch_module(struct module *mod)
 637 {
 638         return false;
 639 }
 640 #endif /* CONFIG_LIVEPATCH */
 641
 642 #else /* !CONFIG_MODULES... */
 643
 644 static inline struct module *__module_address(unsigned long addr)
 645 {
 646         return NULL;
 647 }
 648
 649 static inline struct module *__module_text_address(unsigned long addr)
 650 {
 651         return NULL;
 652 }
 653
 654 static inline bool is_module_address(unsigned long addr)
 655 {
 656         return false;
 657 }
 658
 659 static inline bool is_module_percpu_address(unsigned long addr)
 660 {
 661         return false;
 662 }
 663
 664 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 665 {
 666         return false;
 667 }
 668
 669 static inline bool is_module_text_address(unsigned long addr)
 670 {
 671         return false;
 672 }
 673
 674 /* Get/put a kernel symbol (calls should be symmetric) */
 675 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 676 #define symbol_put(x) do { } while (0)
 677 #define symbol_put_addr(x) do { } while (0)
 678
 679 static inline void __module_get(struct module *module)
 680 {
 681 }
 682
 683 static inline bool try_module_get(struct module *module)
 684 {
 685         return true;
 686 }
 687
 688 static inline void module_put(struct module *module)
 689 {
 690 }
 691
 692 #define module_name(mod) "kernel"
 693
 694 /* For kallsyms to ask for address resolution.  NULL means not found. */
 695 static inline const char *module_address_lookup(unsigned long addr,
 696                                           unsigned long *symbolsize,
 697                                           unsigned long *offset,
 698                                           char **modname,
 699                                           char *namebuf)
 700 {
 701         return NULL;
 702 }
 703
 704 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 705 {
 706         return -ERANGE;
 707 }
 708
 709 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 710 {
 711         return -ERANGE;
 712 }
 713
 714 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 715                                         char *type, char *name,
 716                                         char *module_name, int *exported)
 717 {
 718         return -ERANGE;
 719 }
 720
 721 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 722 {
 723         return 0;
 724 }
 725
 726 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 727                                                            struct module *,
 728                                                            unsigned long),
 729                                                  void *data)
 730 {
 731         return 0;
 732 }
 733
 734 static inline int register_module_notifier(struct notifier_block *nb)
 735 {
 736         /* no events will happen anyway, so this can always succeed */
 737         return 0;
 738 }
 739
 740 static inline int unregister_module_notifier(struct notifier_block *nb)
 741 {
 742         return 0;
 743 }
 744
 745 #define module_put_and_exit(code) do_exit(code)
 746
 747 static inline void print_modules(void)
 748 {
 749 }
 750
 751 static inline bool module_requested_async_probing(struct module *module)
 752 {
 753         return false;
 754 }
 755
 756 #endif /* CONFIG_MODULES */
 757
 758 #ifdef CONFIG_SYSFS
 759 extern struct kset *module_kset;
 760 extern struct kobj_type module_ktype;
 761 extern int module_sysfs_initialized;
 762 #endif /* CONFIG_SYSFS */
 763
 764 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 765
 766 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 767
 768 #define __MODULE_STRING(x) __stringify(x)
 769
 770 #ifdef CONFIG_STRICT_MODULE_RWX
 771 extern void set_all_modules_text_rw(void);
 772 extern void set_all_modules_text_ro(void);
 773 extern void module_enable_ro(const struct module *mod, bool after_init);
 774 extern void module_disable_ro(const struct module *mod);
 775 #else
 776 static inline void set_all_modules_text_rw(void) { }
 777 static inline void set_all_modules_text_ro(void) { }
 778 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 779 static inline void module_disable_ro(const struct module *mod) { }
 780 #endif
 781
 782 #ifdef CONFIG_GENERIC_BUG
 783 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 784                          struct module *);
 785 void module_bug_cleanup(struct module *);
 786
 787 #else   /* !CONFIG_GENERIC_BUG */
 788
 789 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 790                                         const Elf_Shdr *sechdrs,
 791                                         struct module *mod)
 792 {
 793 }
 794 static inline void module_bug_cleanup(struct module *mod) {}
 795 #endif  /* CONFIG_GENERIC_BUG */
 796
 797 #ifdef CONFIG_MODULE_SIG
 798 static inline bool module_sig_ok(struct module *module)
 799 {
 800         return module->sig_ok;
 801 }
 802 #else   /* !CONFIG_MODULE_SIG */
 803 static inline bool module_sig_ok(struct module *module)
 804 {
 805         return true;
 806 }
 807 #endif  /* CONFIG_MODULE_SIG */
 808
 809 #endif /* _LINUX_MODULE_H */