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 #include <linux/cfi.h>
  23
  24 #include <linux/percpu.h>
  25 #include <asm/module.h>
  26
  27 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
  28 #define MODULE_SIG_STRING "~Module signature appended~\n"
  29
  30 /* Not Yet Implemented */
  31 #define MODULE_SUPPORTED_DEVICE(name)
  32
  33 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  34
  35 struct modversion_info {
  36         unsigned long crc;
  37         char name[MODULE_NAME_LEN];
  38 };
  39
  40 struct module;
  41 struct exception_table_entry;
  42
  43 struct module_kobject {
  44         struct kobject kobj;
  45         struct module *mod;
  46         struct kobject *drivers_dir;
  47         struct module_param_attrs *mp;
  48         struct completion *kobj_completion;
  49 } __randomize_layout;
  50
  51 struct module_attribute {
  52         struct attribute attr;
  53         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
  54                         char *);
  55         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
  56                          const char *, size_t count);
  57         void (*setup)(struct module *, const char *);
  58         int (*test)(struct module *);
  59         void (*free)(struct module *);
  60 };
  61
  62 struct module_version_attribute {
  63         struct module_attribute mattr;
  64         const char *module_name;
  65         const char *version;
  66 } __attribute__ ((__aligned__(sizeof(void *))));
  67
  68 extern ssize_t __modver_version_show(struct module_attribute *,
  69                                      struct module_kobject *, char *);
  70
  71 extern struct module_attribute module_uevent;
  72
  73 /* These are either module local, or the kernel's dummy ones. */
  74 extern int init_module(void);
  75 extern void cleanup_module(void);
  76
  77 #ifndef MODULE
  78 /**
  79  * module_init() - driver initialization entry point
  80  * @x: function to be run at kernel boot time or module insertion
  81  *
  82  * module_init() will either be called during do_initcalls() (if
  83  * builtin) or at module insertion time (if a module).  There can only
  84  * be one per module.
  85  */
  86 #define module_init(x)  __initcall(x);
  87
  88 /**
  89  * module_exit() - driver exit entry point
  90  * @x: function to be run when driver is removed
  91  *
  92  * module_exit() will wrap the driver clean-up code
  93  * with cleanup_module() when used with rmmod when
  94  * the driver is a module.  If the driver is statically
  95  * compiled into the kernel, module_exit() has no effect.
  96  * There can only be one per module.
  97  */
  98 #define module_exit(x)  __exitcall(x);
  99
 100 #else /* MODULE */
 101
 102 /*
 103  * In most cases loadable modules do not need custom
 104  * initcall levels. There are still some valid cases where
 105  * a driver may be needed early if built in, and does not
 106  * matter when built as a loadable module. Like bus
 107  * snooping debug drivers.
 108  */
 109 #define early_initcall(fn)              module_init(fn)
 110 #define core_initcall(fn)               module_init(fn)
 111 #define core_initcall_sync(fn)          module_init(fn)
 112 #define postcore_initcall(fn)           module_init(fn)
 113 #define postcore_initcall_sync(fn)      module_init(fn)
 114 #define arch_initcall(fn)               module_init(fn)
 115 #define subsys_initcall(fn)             module_init(fn)
 116 #define subsys_initcall_sync(fn)        module_init(fn)
 117 #define fs_initcall(fn)                 module_init(fn)
 118 #define fs_initcall_sync(fn)            module_init(fn)
 119 #define rootfs_initcall(fn)             module_init(fn)
 120 #define device_initcall(fn)             module_init(fn)
 121 #define device_initcall_sync(fn)        module_init(fn)
 122 #define late_initcall(fn)               module_init(fn)
 123 #define late_initcall_sync(fn)          module_init(fn)
 124
 125 #define console_initcall(fn)            module_init(fn)
 126 #define security_initcall(fn)           module_init(fn)
 127
 128 /* Each module must use one module_init(). */
 129 #define module_init(initfn)                                     \
 130         static inline initcall_t __maybe_unused __inittest(void)                \
 131         { return initfn; }                                      \
 132         int init_module(void) __attribute__((alias(#initfn)));
 133
 134 /* This is only required if you want to be unloadable. */
 135 #define module_exit(exitfn)                                     \
 136         static inline exitcall_t __maybe_unused __exittest(void)                \
 137         { return exitfn; }                                      \
 138         void cleanup_module(void) __attribute__((alias(#exitfn)));
 139
 140 #endif
 141
 142 /* This means "can be init if no module support, otherwise module load
 143    may call it." */
 144 #ifdef CONFIG_MODULES
 145 #define __init_or_module
 146 #define __initdata_or_module
 147 #define __initconst_or_module
 148 #define __INIT_OR_MODULE        .text
 149 #define __INITDATA_OR_MODULE    .data
 150 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
 151 #else
 152 #define __init_or_module __init
 153 #define __initdata_or_module __initdata
 154 #define __initconst_or_module __initconst
 155 #define __INIT_OR_MODULE __INIT
 156 #define __INITDATA_OR_MODULE __INITDATA
 157 #define __INITRODATA_OR_MODULE __INITRODATA
 158 #endif /*CONFIG_MODULES*/
 159
 160 /* Generic info of form tag = "info" */
 161 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 162
 163 /* For userspace: you can also call me... */
 164 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 165
 166 /* Soft module dependencies. See man modprobe.d for details.
 167  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 168  */
 169 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 170
 171 /*
 172  * The following license idents are currently accepted as indicating free
 173  * software modules
 174  *
 175  *      "GPL"                           [GNU Public License v2 or later]
 176  *      "GPL v2"                        [GNU Public License v2]
 177  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 178  *      "Dual BSD/GPL"                  [GNU Public License v2
 179  *                                       or BSD license choice]
 180  *      "Dual MIT/GPL"                  [GNU Public License v2
 181  *                                       or MIT license choice]
 182  *      "Dual MPL/GPL"                  [GNU Public License v2
 183  *                                       or Mozilla license choice]
 184  *
 185  * The following other idents are available
 186  *
 187  *      "Proprietary"                   [Non free products]
 188  *
 189  * There are dual licensed components, but when running with Linux it is the
 190  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 191  * is a GPL combined work.
 192  *
 193  * This exists for several reasons
 194  * 1.   So modinfo can show license info for users wanting to vet their setup
 195  *      is free
 196  * 2.   So the community can ignore bug reports including proprietary modules
 197  * 3.   So vendors can do likewise based on their own policies
 198  */
 199 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
 200
 201 /*
 202  * Author(s), use "Name <email>" or just "Name", for multiple
 203  * authors use multiple MODULE_AUTHOR() statements/lines.
 204  */
 205 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 206
 207 /* What your module does. */
 208 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 209
 210 #ifdef MODULE
 211 /* Creates an alias so file2alias.c can find device table. */
 212 #define MODULE_DEVICE_TABLE(type, name)                                 \
 213 extern typeof(name) __mod_##type##__##name##_device_table               \
 214   __attribute__ ((unused, alias(__stringify(name))))
 215 #else  /* !MODULE */
 216 #define MODULE_DEVICE_TABLE(type, name)
 217 #endif
 218
 219 /* Version of form [<epoch>:]<version>[-<extra-version>].
 220  * Or for CVS/RCS ID version, everything but the number is stripped.
 221  * <epoch>: A (small) unsigned integer which allows you to start versions
 222  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 223  * "1:2.0".
 224
 225  * <version>: The <version> may contain only alphanumerics and the
 226  * character `.'.  Ordered by numeric sort for numeric parts,
 227  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 228
 229  * <extraversion>: Like <version>, but inserted for local
 230  * customizations, eg "rh3" or "rusty1".
 231
 232  * Using this automatically adds a checksum of the .c files and the
 233  * local headers in "srcversion".
 234  */
 235
 236 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 237 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 238 #else
 239 #define MODULE_VERSION(_version)                                        \
 240         static struct module_version_attribute ___modver_attr = {       \
 241                 .mattr  = {                                             \
 242                         .attr   = {                                     \
 243                                 .name   = "version",                    \
 244                                 .mode   = S_IRUGO,                      \
 245                         },                                              \
 246                         .show   = __modver_version_show,                \
 247                 },                                                      \
 248                 .module_name    = KBUILD_MODNAME,                       \
 249                 .version        = _version,                             \
 250         };                                                              \
 251         static const struct module_version_attribute                    \
 252         __used __attribute__ ((__section__ ("__modver")))               \
 253         * __moduleparam_const __modver_attr = &___modver_attr
 254 #endif
 255
 256 /* Optional firmware file (or files) needed by the module
 257  * format is simply firmware file name.  Multiple firmware
 258  * files require multiple MODULE_FIRMWARE() specifiers */
 259 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 260
 261 struct notifier_block;
 262
 263 #ifdef CONFIG_MODULES
 264
 265 extern int modules_disabled; /* for sysctl */
 266 /* Get/put a kernel symbol (calls must be symmetric) */
 267 void *__symbol_get(const char *symbol);
 268 void *__symbol_get_gpl(const char *symbol);
 269 #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x))))
 270
 271 /* modules using other modules: kdb wants to see this. */
 272 struct module_use {
 273         struct list_head source_list;
 274         struct list_head target_list;
 275         struct module *source, *target;
 276 };
 277
 278 enum module_state {
 279         MODULE_STATE_LIVE,      /* Normal state. */
 280         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 281         MODULE_STATE_GOING,     /* Going away. */
 282         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 283 };
 284
 285 struct mod_tree_node {
 286         struct module *mod;
 287         struct latch_tree_node node;
 288 };
 289
 290 struct module_layout {
 291         /* The actual code + data. */
 292         void *base;
 293         /* Total size. */
 294         unsigned int size;
 295         /* The size of the executable code.  */
 296         unsigned int text_size;
 297         /* Size of RO section of the module (text+rodata) */
 298         unsigned int ro_size;
 299         /* Size of RO after init section */
 300         unsigned int ro_after_init_size;
 301
 302 #ifdef CONFIG_MODULES_TREE_LOOKUP
 303         struct mod_tree_node mtn;
 304 #endif
 305 };
 306
 307 #ifdef CONFIG_MODULES_TREE_LOOKUP
 308 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 309 #define __module_layout_align ____cacheline_aligned
 310 #else
 311 #define __module_layout_align
 312 #endif
 313
 314 struct mod_kallsyms {
 315         Elf_Sym *symtab;
 316         unsigned int num_symtab;
 317         char *strtab;
 318 };
 319
 320 #ifdef CONFIG_LIVEPATCH
 321 struct klp_modinfo {
 322         Elf_Ehdr hdr;
 323         Elf_Shdr *sechdrs;
 324         char *secstrings;
 325         unsigned int symndx;
 326 };
 327 #endif
 328
 329 struct module {
 330         enum module_state state;
 331
 332         /* Member of list of modules */
 333         struct list_head list;
 334
 335         /* Unique handle for this module */
 336         char name[MODULE_NAME_LEN];
 337
 338         /* Sysfs stuff. */
 339         struct module_kobject mkobj;
 340         struct module_attribute *modinfo_attrs;
 341         const char *version;
 342         const char *srcversion;
 343         struct kobject *holders_dir;
 344
 345         /* Exported symbols */
 346         const struct kernel_symbol *syms;
 347         const s32 *crcs;
 348         unsigned int num_syms;
 349
 350 #ifdef CONFIG_CFI_CLANG
 351         cfi_check_fn cfi_check;
 352 #endif
 353
 354         /* Kernel parameters. */
 355 #ifdef CONFIG_SYSFS
 356         struct mutex param_lock;
 357 #endif
 358         struct kernel_param *kp;
 359         unsigned int num_kp;
 360
 361         /* GPL-only exported symbols. */
 362         unsigned int num_gpl_syms;
 363         const struct kernel_symbol *gpl_syms;
 364         const s32 *gpl_crcs;
 365
 366 #ifdef CONFIG_UNUSED_SYMBOLS
 367         /* unused exported symbols. */
 368         const struct kernel_symbol *unused_syms;
 369         const s32 *unused_crcs;
 370         unsigned int num_unused_syms;
 371
 372         /* GPL-only, unused exported symbols. */
 373         unsigned int num_unused_gpl_syms;
 374         const struct kernel_symbol *unused_gpl_syms;
 375         const s32 *unused_gpl_crcs;
 376 #endif
 377
 378 #ifdef CONFIG_MODULE_SIG
 379         /* Signature was verified. */
 380         bool sig_ok;
 381 #endif
 382
 383         bool async_probe_requested;
 384
 385         /* symbols that will be GPL-only in the near future. */
 386         const struct kernel_symbol *gpl_future_syms;
 387         const s32 *gpl_future_crcs;
 388         unsigned int num_gpl_future_syms;
 389
 390         /* Exception table */
 391         unsigned int num_exentries;
 392         struct exception_table_entry *extable;
 393
 394         /* Startup function. */
 395         int (*init)(void);
 396
 397         /* Core layout: rbtree is accessed frequently, so keep together. */
 398         struct module_layout core_layout __module_layout_align;
 399         struct module_layout init_layout;
 400
 401         /* Arch-specific module values */
 402         struct mod_arch_specific arch;
 403
 404         unsigned long taints;   /* same bits as kernel:taint_flags */
 405
 406 #ifdef CONFIG_GENERIC_BUG
 407         /* Support for BUG */
 408         unsigned num_bugs;
 409         struct list_head bug_list;
 410         struct bug_entry *bug_table;
 411 #endif
 412
 413 #ifdef CONFIG_KALLSYMS
 414         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 415         struct mod_kallsyms *kallsyms;
 416         struct mod_kallsyms core_kallsyms;
 417
 418         /* Section attributes */
 419         struct module_sect_attrs *sect_attrs;
 420
 421         /* Notes attributes */
 422         struct module_notes_attrs *notes_attrs;
 423 #endif
 424
 425         /* The command line arguments (may be mangled).  People like
 426            keeping pointers to this stuff */
 427         char *args;
 428
 429 #ifdef CONFIG_SMP
 430         /* Per-cpu data. */
 431         void __percpu *percpu;
 432         unsigned int percpu_size;
 433 #endif
 434
 435 #ifdef CONFIG_TRACEPOINTS
 436         unsigned int num_tracepoints;
 437         struct tracepoint * const *tracepoints_ptrs;
 438 #endif
 439 #ifdef HAVE_JUMP_LABEL
 440         struct jump_entry *jump_entries;
 441         unsigned int num_jump_entries;
 442 #endif
 443 #ifdef CONFIG_TRACING
 444         unsigned int num_trace_bprintk_fmt;
 445         const char **trace_bprintk_fmt_start;
 446 #endif
 447 #ifdef CONFIG_EVENT_TRACING
 448         struct trace_event_call **trace_events;
 449         unsigned int num_trace_events;
 450         struct trace_eval_map **trace_evals;
 451         unsigned int num_trace_evals;
 452 #endif
 453 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 454         unsigned int num_ftrace_callsites;
 455         unsigned long *ftrace_callsites;
 456 #endif
 457
 458 #ifdef CONFIG_LIVEPATCH
 459         bool klp; /* Is this a livepatch module? */
 460         bool klp_alive;
 461
 462         /* Elf information */
 463         struct klp_modinfo *klp_info;
 464 #endif
 465
 466 #ifdef CONFIG_MODULE_UNLOAD
 467         /* What modules depend on me? */
 468         struct list_head source_list;
 469         /* What modules do I depend on? */
 470         struct list_head target_list;
 471
 472         /* Destruction function. */
 473         void (*exit)(void);
 474
 475         atomic_t refcnt;
 476 #endif
 477
 478 #ifdef CONFIG_CONSTRUCTORS
 479         /* Constructor functions. */
 480         ctor_fn_t *ctors;
 481         unsigned int num_ctors;
 482 #endif
 483 } ____cacheline_aligned __randomize_layout;
 484 #ifndef MODULE_ARCH_INIT
 485 #define MODULE_ARCH_INIT {}
 486 #endif
 487
 488 extern struct mutex module_mutex;
 489
 490 /* FIXME: It'd be nice to isolate modules during init, too, so they
 491    aren't used before they (may) fail.  But presently too much code
 492    (IDE & SCSI) require entry into the module during init.*/
 493 static inline int module_is_live(struct module *mod)
 494 {
 495         return mod->state != MODULE_STATE_GOING;
 496 }
 497
 498 struct module *__module_text_address(unsigned long addr);
 499 struct module *__module_address(unsigned long addr);
 500 bool is_module_address(unsigned long addr);
 501 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 502 bool is_module_percpu_address(unsigned long addr);
 503 bool is_module_text_address(unsigned long addr);
 504
 505 static inline bool within_module_core(unsigned long addr,
 506                                       const struct module *mod)
 507 {
 508         return (unsigned long)mod->core_layout.base <= addr &&
 509                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 510 }
 511
 512 static inline bool within_module_init(unsigned long addr,
 513                                       const struct module *mod)
 514 {
 515         return (unsigned long)mod->init_layout.base <= addr &&
 516                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 517 }
 518
 519 static inline bool within_module(unsigned long addr, const struct module *mod)
 520 {
 521         return within_module_init(addr, mod) || within_module_core(addr, mod);
 522 }
 523
 524 /* Search for module by name: must hold module_mutex. */
 525 struct module *find_module(const char *name);
 526
 527 struct symsearch {
 528         const struct kernel_symbol *start, *stop;
 529         const s32 *crcs;
 530         enum {
 531                 NOT_GPL_ONLY,
 532                 GPL_ONLY,
 533                 WILL_BE_GPL_ONLY,
 534         } licence;
 535         bool unused;
 536 };
 537
 538 /*
 539  * Search for an exported symbol by name.
 540  *
 541  * Must be called with module_mutex held or preemption disabled.
 542  */
 543 const struct kernel_symbol *find_symbol(const char *name,
 544                                         struct module **owner,
 545                                         const s32 **crc,
 546                                         bool gplok,
 547                                         bool warn);
 548
 549 /*
 550  * Walk the exported symbol table
 551  *
 552  * Must be called with module_mutex held or preemption disabled.
 553  */
 554 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 555                                     struct module *owner,
 556                                     void *data), void *data);
 557
 558 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 559    symnum out of range. */
 560 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 561                         char *name, char *module_name, int *exported);
 562
 563 /* Look for this name: can be of form module:name. */
 564 unsigned long module_kallsyms_lookup_name(const char *name);
 565
 566 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 567                                              struct module *, unsigned long),
 568                                    void *data);
 569
 570 extern void __noreturn __module_put_and_exit(struct module *mod,
 571                         long code);
 572 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 573
 574 #ifdef CONFIG_MODULE_UNLOAD
 575 int module_refcount(struct module *mod);
 576 void __symbol_put(const char *symbol);
 577 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
 578 void symbol_put_addr(void *addr);
 579
 580 /* Sometimes we know we already have a refcount, and it's easier not
 581    to handle the error case (which only happens with rmmod --wait). */
 582 extern void __module_get(struct module *module);
 583
 584 /* This is the Right Way to get a module: if it fails, it's being removed,
 585  * so pretend it's not there. */
 586 extern bool try_module_get(struct module *module);
 587
 588 extern void module_put(struct module *module);
 589
 590 #else /*!CONFIG_MODULE_UNLOAD*/
 591 static inline bool try_module_get(struct module *module)
 592 {
 593         return !module || module_is_live(module);
 594 }
 595 static inline void module_put(struct module *module)
 596 {
 597 }
 598 static inline void __module_get(struct module *module)
 599 {
 600 }
 601 #define symbol_put(x) do { } while (0)
 602 #define symbol_put_addr(p) do { } while (0)
 603
 604 #endif /* CONFIG_MODULE_UNLOAD */
 605 int ref_module(struct module *a, struct module *b);
 606
 607 /* This is a #define so the string doesn't get put in every .o file */
 608 #define module_name(mod)                        \
 609 ({                                              \
 610         struct module *__mod = (mod);           \
 611         __mod ? __mod->name : "kernel";         \
 612 })
 613
 614 /* For kallsyms to ask for address resolution.  namebuf should be at
 615  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 616  * found, otherwise NULL. */
 617 const char *module_address_lookup(unsigned long addr,
 618                             unsigned long *symbolsize,
 619                             unsigned long *offset,
 620                             char **modname,
 621                             char *namebuf);
 622 int lookup_module_symbol_name(unsigned long addr, char *symname);
 623 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 624
 625 int register_module_notifier(struct notifier_block *nb);
 626 int unregister_module_notifier(struct notifier_block *nb);
 627
 628 extern void print_modules(void);
 629
 630 static inline bool module_requested_async_probing(struct module *module)
 631 {
 632         return module && module->async_probe_requested;
 633 }
 634
 635 #ifdef CONFIG_LIVEPATCH
 636 static inline bool is_livepatch_module(struct module *mod)
 637 {
 638         return mod->klp;
 639 }
 640 #else /* !CONFIG_LIVEPATCH */
 641 static inline bool is_livepatch_module(struct module *mod)
 642 {
 643         return false;
 644 }
 645 #endif /* CONFIG_LIVEPATCH */
 646
 647 #else /* !CONFIG_MODULES... */
 648
 649 static inline struct module *__module_address(unsigned long addr)
 650 {
 651         return NULL;
 652 }
 653
 654 static inline struct module *__module_text_address(unsigned long addr)
 655 {
 656         return NULL;
 657 }
 658
 659 static inline bool is_module_address(unsigned long addr)
 660 {
 661         return false;
 662 }
 663
 664 static inline bool is_module_percpu_address(unsigned long addr)
 665 {
 666         return false;
 667 }
 668
 669 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 670 {
 671         return false;
 672 }
 673
 674 static inline bool is_module_text_address(unsigned long addr)
 675 {
 676         return false;
 677 }
 678
 679 /* Get/put a kernel symbol (calls should be symmetric) */
 680 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 681 #define symbol_put(x) do { } while (0)
 682 #define symbol_put_addr(x) do { } while (0)
 683
 684 static inline void __module_get(struct module *module)
 685 {
 686 }
 687
 688 static inline bool try_module_get(struct module *module)
 689 {
 690         return true;
 691 }
 692
 693 static inline void module_put(struct module *module)
 694 {
 695 }
 696
 697 #define module_name(mod) "kernel"
 698
 699 /* For kallsyms to ask for address resolution.  NULL means not found. */
 700 static inline const char *module_address_lookup(unsigned long addr,
 701                                           unsigned long *symbolsize,
 702                                           unsigned long *offset,
 703                                           char **modname,
 704                                           char *namebuf)
 705 {
 706         return NULL;
 707 }
 708
 709 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 710 {
 711         return -ERANGE;
 712 }
 713
 714 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 715 {
 716         return -ERANGE;
 717 }
 718
 719 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 720                                         char *type, char *name,
 721                                         char *module_name, int *exported)
 722 {
 723         return -ERANGE;
 724 }
 725
 726 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 727 {
 728         return 0;
 729 }
 730
 731 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 732                                                            struct module *,
 733                                                            unsigned long),
 734                                                  void *data)
 735 {
 736         return 0;
 737 }
 738
 739 static inline int register_module_notifier(struct notifier_block *nb)
 740 {
 741         /* no events will happen anyway, so this can always succeed */
 742         return 0;
 743 }
 744
 745 static inline int unregister_module_notifier(struct notifier_block *nb)
 746 {
 747         return 0;
 748 }
 749
 750 #define module_put_and_exit(code) do_exit(code)
 751
 752 static inline void print_modules(void)
 753 {
 754 }
 755
 756 static inline bool module_requested_async_probing(struct module *module)
 757 {
 758         return false;
 759 }
 760
 761 #endif /* CONFIG_MODULES */
 762
 763 #ifdef CONFIG_SYSFS
 764 extern struct kset *module_kset;
 765 extern struct kobj_type module_ktype;
 766 extern int module_sysfs_initialized;
 767 #endif /* CONFIG_SYSFS */
 768
 769 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 770
 771 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 772
 773 #define __MODULE_STRING(x) __stringify(x)
 774
 775 #ifdef CONFIG_STRICT_MODULE_RWX
 776 extern void set_all_modules_text_rw(void);
 777 extern void set_all_modules_text_ro(void);
 778 extern void module_enable_ro(const struct module *mod, bool after_init);
 779 extern void module_disable_ro(const struct module *mod);
 780 #else
 781 static inline void set_all_modules_text_rw(void) { }
 782 static inline void set_all_modules_text_ro(void) { }
 783 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 784 static inline void module_disable_ro(const struct module *mod) { }
 785 #endif
 786
 787 #ifdef CONFIG_GENERIC_BUG
 788 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 789                          struct module *);
 790 void module_bug_cleanup(struct module *);
 791
 792 #else   /* !CONFIG_GENERIC_BUG */
 793
 794 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 795                                         const Elf_Shdr *sechdrs,
 796                                         struct module *mod)
 797 {
 798 }
 799 static inline void module_bug_cleanup(struct module *mod) {}
 800 #endif  /* CONFIG_GENERIC_BUG */
 801
 802 #ifdef CONFIG_RETPOLINE
 803 extern bool retpoline_module_ok(bool has_retpoline);
 804 #else
 805 static inline bool retpoline_module_ok(bool has_retpoline)
 806 {
 807         return true;
 808 }
 809 #endif
 810
 811 #ifdef CONFIG_MODULE_SIG
 812 static inline bool module_sig_ok(struct module *module)
 813 {
 814         return module->sig_ok;
 815 }
 816 #else   /* !CONFIG_MODULE_SIG */
 817 static inline bool module_sig_ok(struct module *module)
 818 {
 819         return true;
 820 }
 821 #endif  /* CONFIG_MODULE_SIG */
 822
 823 #endif /* _LINUX_MODULE_H */