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TOMOYO Linux Cross Reference
Linux/include/linux/module.h

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  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 
 41 struct module_kobject {
 42         struct kobject kobj;
 43         struct module *mod;
 44         struct kobject *drivers_dir;
 45         struct module_param_attrs *mp;
 46         struct completion *kobj_completion;
 47 };
 48 
 49 struct module_attribute {
 50         struct attribute attr;
 51         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
 52                         char *);
 53         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
 54                          const char *, size_t count);
 55         void (*setup)(struct module *, const char *);
 56         int (*test)(struct module *);
 57         void (*free)(struct module *);
 58 };
 59 
 60 struct module_version_attribute {
 61         struct module_attribute mattr;
 62         const char *module_name;
 63         const char *version;
 64 } __attribute__ ((__aligned__(sizeof(void *))));
 65 
 66 extern ssize_t __modver_version_show(struct module_attribute *,
 67                                      struct module_kobject *, char *);
 68 
 69 extern struct module_attribute module_uevent;
 70 
 71 /* These are either module local, or the kernel's dummy ones. */
 72 extern int init_module(void);
 73 extern void cleanup_module(void);
 74 
 75 #ifndef MODULE
 76 /**
 77  * module_init() - driver initialization entry point
 78  * @x: function to be run at kernel boot time or module insertion
 79  *
 80  * module_init() will either be called during do_initcalls() (if
 81  * builtin) or at module insertion time (if a module).  There can only
 82  * be one per module.
 83  */
 84 #define module_init(x)  __initcall(x);
 85 
 86 /**
 87  * module_exit() - driver exit entry point
 88  * @x: function to be run when driver is removed
 89  *
 90  * module_exit() will wrap the driver clean-up code
 91  * with cleanup_module() when used with rmmod when
 92  * the driver is a module.  If the driver is statically
 93  * compiled into the kernel, module_exit() has no effect.
 94  * There can only be one per module.
 95  */
 96 #define module_exit(x)  __exitcall(x);
 97 
 98 #else /* MODULE */
 99 
100 /*
101  * In most cases loadable modules do not need custom
102  * initcall levels. There are still some valid cases where
103  * a driver may be needed early if built in, and does not
104  * matter when built as a loadable module. Like bus
105  * snooping debug drivers.
106  */
107 #define early_initcall(fn)              module_init(fn)
108 #define core_initcall(fn)               module_init(fn)
109 #define core_initcall_sync(fn)          module_init(fn)
110 #define postcore_initcall(fn)           module_init(fn)
111 #define postcore_initcall_sync(fn)      module_init(fn)
112 #define arch_initcall(fn)               module_init(fn)
113 #define subsys_initcall(fn)             module_init(fn)
114 #define subsys_initcall_sync(fn)        module_init(fn)
115 #define fs_initcall(fn)                 module_init(fn)
116 #define fs_initcall_sync(fn)            module_init(fn)
117 #define rootfs_initcall(fn)             module_init(fn)
118 #define device_initcall(fn)             module_init(fn)
119 #define device_initcall_sync(fn)        module_init(fn)
120 #define late_initcall(fn)               module_init(fn)
121 #define late_initcall_sync(fn)          module_init(fn)
122 
123 #define console_initcall(fn)            module_init(fn)
124 #define security_initcall(fn)           module_init(fn)
125 
126 /* Each module must use one module_init(). */
127 #define module_init(initfn)                                     \
128         static inline initcall_t __inittest(void)               \
129         { return initfn; }                                      \
130         int init_module(void) __attribute__((alias(#initfn)));
131 
132 /* This is only required if you want to be unloadable. */
133 #define module_exit(exitfn)                                     \
134         static inline exitcall_t __exittest(void)               \
135         { return exitfn; }                                      \
136         void cleanup_module(void) __attribute__((alias(#exitfn)));
137 
138 #endif
139 
140 /* This means "can be init if no module support, otherwise module load
141    may call it." */
142 #ifdef CONFIG_MODULES
143 #define __init_or_module
144 #define __initdata_or_module
145 #define __initconst_or_module
146 #define __INIT_OR_MODULE        .text
147 #define __INITDATA_OR_MODULE    .data
148 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
149 #else
150 #define __init_or_module __init
151 #define __initdata_or_module __initdata
152 #define __initconst_or_module __initconst
153 #define __INIT_OR_MODULE __INIT
154 #define __INITDATA_OR_MODULE __INITDATA
155 #define __INITRODATA_OR_MODULE __INITRODATA
156 #endif /*CONFIG_MODULES*/
157 
158 /* Archs provide a method of finding the correct exception table. */
159 struct exception_table_entry;
160 
161 const struct exception_table_entry *
162 search_extable(const struct exception_table_entry *first,
163                const struct exception_table_entry *last,
164                unsigned long value);
165 void sort_extable(struct exception_table_entry *start,
166                   struct exception_table_entry *finish);
167 void sort_main_extable(void);
168 void trim_init_extable(struct module *m);
169 
170 /* Generic info of form tag = "info" */
171 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
172 
173 /* For userspace: you can also call me... */
174 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
175 
176 /* Soft module dependencies. See man modprobe.d for details.
177  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
178  */
179 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
180 
181 /*
182  * The following license idents are currently accepted as indicating free
183  * software modules
184  *
185  *      "GPL"                           [GNU Public License v2 or later]
186  *      "GPL v2"                        [GNU Public License v2]
187  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
188  *      "Dual BSD/GPL"                  [GNU Public License v2
189  *                                       or BSD license choice]
190  *      "Dual MIT/GPL"                  [GNU Public License v2
191  *                                       or MIT license choice]
192  *      "Dual MPL/GPL"                  [GNU Public License v2
193  *                                       or Mozilla license choice]
194  *
195  * The following other idents are available
196  *
197  *      "Proprietary"                   [Non free products]
198  *
199  * There are dual licensed components, but when running with Linux it is the
200  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
201  * is a GPL combined work.
202  *
203  * This exists for several reasons
204  * 1.   So modinfo can show license info for users wanting to vet their setup
205  *      is free
206  * 2.   So the community can ignore bug reports including proprietary modules
207  * 3.   So vendors can do likewise based on their own policies
208  */
209 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
210 
211 /*
212  * Author(s), use "Name <email>" or just "Name", for multiple
213  * authors use multiple MODULE_AUTHOR() statements/lines.
214  */
215 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
216 
217 /* What your module does. */
218 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
219 
220 #ifdef MODULE
221 /* Creates an alias so file2alias.c can find device table. */
222 #define MODULE_DEVICE_TABLE(type, name)                                 \
223 extern const typeof(name) __mod_##type##__##name##_device_table         \
224   __attribute__ ((unused, alias(__stringify(name))))
225 #else  /* !MODULE */
226 #define MODULE_DEVICE_TABLE(type, name)
227 #endif
228 
229 /* Version of form [<epoch>:]<version>[-<extra-version>].
230  * Or for CVS/RCS ID version, everything but the number is stripped.
231  * <epoch>: A (small) unsigned integer which allows you to start versions
232  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
233  * "1:2.0".
234 
235  * <version>: The <version> may contain only alphanumerics and the
236  * character `.'.  Ordered by numeric sort for numeric parts,
237  * ascii sort for ascii parts (as per RPM or DEB algorithm).
238 
239  * <extraversion>: Like <version>, but inserted for local
240  * customizations, eg "rh3" or "rusty1".
241 
242  * Using this automatically adds a checksum of the .c files and the
243  * local headers in "srcversion".
244  */
245 
246 #if defined(MODULE) || !defined(CONFIG_SYSFS)
247 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
248 #else
249 #define MODULE_VERSION(_version)                                        \
250         static struct module_version_attribute ___modver_attr = {       \
251                 .mattr  = {                                             \
252                         .attr   = {                                     \
253                                 .name   = "version",                    \
254                                 .mode   = S_IRUGO,                      \
255                         },                                              \
256                         .show   = __modver_version_show,                \
257                 },                                                      \
258                 .module_name    = KBUILD_MODNAME,                       \
259                 .version        = _version,                             \
260         };                                                              \
261         static const struct module_version_attribute                    \
262         __used __attribute__ ((__section__ ("__modver")))               \
263         * __moduleparam_const __modver_attr = &___modver_attr
264 #endif
265 
266 /* Optional firmware file (or files) needed by the module
267  * format is simply firmware file name.  Multiple firmware
268  * files require multiple MODULE_FIRMWARE() specifiers */
269 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
270 
271 /* Given an address, look for it in the exception tables */
272 const struct exception_table_entry *search_exception_tables(unsigned long add);
273 
274 struct notifier_block;
275 
276 #ifdef CONFIG_MODULES
277 
278 extern int modules_disabled; /* for sysctl */
279 /* Get/put a kernel symbol (calls must be symmetric) */
280 void *__symbol_get(const char *symbol);
281 void *__symbol_get_gpl(const char *symbol);
282 #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x))))
283 
284 /* modules using other modules: kdb wants to see this. */
285 struct module_use {
286         struct list_head source_list;
287         struct list_head target_list;
288         struct module *source, *target;
289 };
290 
291 enum module_state {
292         MODULE_STATE_LIVE,      /* Normal state. */
293         MODULE_STATE_COMING,    /* Full formed, running module_init. */
294         MODULE_STATE_GOING,     /* Going away. */
295         MODULE_STATE_UNFORMED,  /* Still setting it up. */
296 };
297 
298 struct module;
299 
300 struct mod_tree_node {
301         struct module *mod;
302         struct latch_tree_node node;
303 };
304 
305 struct module_layout {
306         /* The actual code + data. */
307         void *base;
308         /* Total size. */
309         unsigned int size;
310         /* The size of the executable code.  */
311         unsigned int text_size;
312         /* Size of RO section of the module (text+rodata) */
313         unsigned int ro_size;
314 
315 #ifdef CONFIG_MODULES_TREE_LOOKUP
316         struct mod_tree_node mtn;
317 #endif
318 };
319 
320 #ifdef CONFIG_MODULES_TREE_LOOKUP
321 /* Only touch one cacheline for common rbtree-for-core-layout case. */
322 #define __module_layout_align ____cacheline_aligned
323 #else
324 #define __module_layout_align
325 #endif
326 
327 struct mod_kallsyms {
328         Elf_Sym *symtab;
329         unsigned int num_symtab;
330         char *strtab;
331 };
332 
333 #ifdef CONFIG_LIVEPATCH
334 struct klp_modinfo {
335         Elf_Ehdr hdr;
336         Elf_Shdr *sechdrs;
337         char *secstrings;
338         unsigned int symndx;
339 };
340 #endif
341 
342 struct module {
343         enum module_state state;
344 
345         /* Member of list of modules */
346         struct list_head list;
347 
348         /* Unique handle for this module */
349         char name[MODULE_NAME_LEN];
350 
351         /* Sysfs stuff. */
352         struct module_kobject mkobj;
353         struct module_attribute *modinfo_attrs;
354         const char *version;
355         const char *srcversion;
356         struct kobject *holders_dir;
357 
358         /* Exported symbols */
359         const struct kernel_symbol *syms;
360         const unsigned long *crcs;
361         unsigned int num_syms;
362 
363         /* Kernel parameters. */
364 #ifdef CONFIG_SYSFS
365         struct mutex param_lock;
366 #endif
367         struct kernel_param *kp;
368         unsigned int num_kp;
369 
370         /* GPL-only exported symbols. */
371         unsigned int num_gpl_syms;
372         const struct kernel_symbol *gpl_syms;
373         const unsigned long *gpl_crcs;
374 
375 #ifdef CONFIG_UNUSED_SYMBOLS
376         /* unused exported symbols. */
377         const struct kernel_symbol *unused_syms;
378         const unsigned long *unused_crcs;
379         unsigned int num_unused_syms;
380 
381         /* GPL-only, unused exported symbols. */
382         unsigned int num_unused_gpl_syms;
383         const struct kernel_symbol *unused_gpl_syms;
384         const unsigned long *unused_gpl_crcs;
385 #endif
386 
387 #ifdef CONFIG_MODULE_SIG
388         /* Signature was verified. */
389         bool sig_ok;
390 #endif
391 
392         bool async_probe_requested;
393 
394         /* symbols that will be GPL-only in the near future. */
395         const struct kernel_symbol *gpl_future_syms;
396         const unsigned long *gpl_future_crcs;
397         unsigned int num_gpl_future_syms;
398 
399         /* Exception table */
400         unsigned int num_exentries;
401         struct exception_table_entry *extable;
402 
403         /* Startup function. */
404         int (*init)(void);
405 
406         /* Core layout: rbtree is accessed frequently, so keep together. */
407         struct module_layout core_layout __module_layout_align;
408         struct module_layout init_layout;
409 
410         /* Arch-specific module values */
411         struct mod_arch_specific arch;
412 
413         unsigned int taints;    /* same bits as kernel:tainted */
414 
415 #ifdef CONFIG_GENERIC_BUG
416         /* Support for BUG */
417         unsigned num_bugs;
418         struct list_head bug_list;
419         struct bug_entry *bug_table;
420 #endif
421 
422 #ifdef CONFIG_KALLSYMS
423         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
424         struct mod_kallsyms *kallsyms;
425         struct mod_kallsyms core_kallsyms;
426         
427         /* Section attributes */
428         struct module_sect_attrs *sect_attrs;
429 
430         /* Notes attributes */
431         struct module_notes_attrs *notes_attrs;
432 #endif
433 
434         /* The command line arguments (may be mangled).  People like
435            keeping pointers to this stuff */
436         char *args;
437 
438 #ifdef CONFIG_SMP
439         /* Per-cpu data. */
440         void __percpu *percpu;
441         unsigned int percpu_size;
442 #endif
443 
444 #ifdef CONFIG_TRACEPOINTS
445         unsigned int num_tracepoints;
446         struct tracepoint * const *tracepoints_ptrs;
447 #endif
448 #ifdef HAVE_JUMP_LABEL
449         struct jump_entry *jump_entries;
450         unsigned int num_jump_entries;
451 #endif
452 #ifdef CONFIG_TRACING
453         unsigned int num_trace_bprintk_fmt;
454         const char **trace_bprintk_fmt_start;
455 #endif
456 #ifdef CONFIG_EVENT_TRACING
457         struct trace_event_call **trace_events;
458         unsigned int num_trace_events;
459         struct trace_enum_map **trace_enums;
460         unsigned int num_trace_enums;
461 #endif
462 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
463         unsigned int num_ftrace_callsites;
464         unsigned long *ftrace_callsites;
465 #endif
466 
467 #ifdef CONFIG_LIVEPATCH
468         bool klp; /* Is this a livepatch module? */
469         bool klp_alive;
470 
471         /* Elf information */
472         struct klp_modinfo *klp_info;
473 #endif
474 
475 #ifdef CONFIG_MODULE_UNLOAD
476         /* What modules depend on me? */
477         struct list_head source_list;
478         /* What modules do I depend on? */
479         struct list_head target_list;
480 
481         /* Destruction function. */
482         void (*exit)(void);
483 
484         atomic_t refcnt;
485 #endif
486 
487 #ifdef CONFIG_CONSTRUCTORS
488         /* Constructor functions. */
489         ctor_fn_t *ctors;
490         unsigned int num_ctors;
491 #endif
492 } ____cacheline_aligned;
493 #ifndef MODULE_ARCH_INIT
494 #define MODULE_ARCH_INIT {}
495 #endif
496 
497 extern struct mutex module_mutex;
498 
499 /* FIXME: It'd be nice to isolate modules during init, too, so they
500    aren't used before they (may) fail.  But presently too much code
501    (IDE & SCSI) require entry into the module during init.*/
502 static inline int module_is_live(struct module *mod)
503 {
504         return mod->state != MODULE_STATE_GOING;
505 }
506 
507 struct module *__module_text_address(unsigned long addr);
508 struct module *__module_address(unsigned long addr);
509 bool is_module_address(unsigned long addr);
510 bool is_module_percpu_address(unsigned long addr);
511 bool is_module_text_address(unsigned long addr);
512 
513 static inline bool within_module_core(unsigned long addr,
514                                       const struct module *mod)
515 {
516         return (unsigned long)mod->core_layout.base <= addr &&
517                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
518 }
519 
520 static inline bool within_module_init(unsigned long addr,
521                                       const struct module *mod)
522 {
523         return (unsigned long)mod->init_layout.base <= addr &&
524                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
525 }
526 
527 static inline bool within_module(unsigned long addr, const struct module *mod)
528 {
529         return within_module_init(addr, mod) || within_module_core(addr, mod);
530 }
531 
532 /* Search for module by name: must hold module_mutex. */
533 struct module *find_module(const char *name);
534 
535 struct symsearch {
536         const struct kernel_symbol *start, *stop;
537         const unsigned long *crcs;
538         enum {
539                 NOT_GPL_ONLY,
540                 GPL_ONLY,
541                 WILL_BE_GPL_ONLY,
542         } licence;
543         bool unused;
544 };
545 
546 /*
547  * Search for an exported symbol by name.
548  *
549  * Must be called with module_mutex held or preemption disabled.
550  */
551 const struct kernel_symbol *find_symbol(const char *name,
552                                         struct module **owner,
553                                         const unsigned long **crc,
554                                         bool gplok,
555                                         bool warn);
556 
557 /*
558  * Walk the exported symbol table
559  *
560  * Must be called with module_mutex held or preemption disabled.
561  */
562 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
563                                     struct module *owner,
564                                     void *data), void *data);
565 
566 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
567    symnum out of range. */
568 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
569                         char *name, char *module_name, int *exported);
570 
571 /* Look for this name: can be of form module:name. */
572 unsigned long module_kallsyms_lookup_name(const char *name);
573 
574 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
575                                              struct module *, unsigned long),
576                                    void *data);
577 
578 extern void __module_put_and_exit(struct module *mod, long code)
579         __attribute__((noreturn));
580 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
581 
582 #ifdef CONFIG_MODULE_UNLOAD
583 int module_refcount(struct module *mod);
584 void __symbol_put(const char *symbol);
585 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
586 void symbol_put_addr(void *addr);
587 
588 /* Sometimes we know we already have a refcount, and it's easier not
589    to handle the error case (which only happens with rmmod --wait). */
590 extern void __module_get(struct module *module);
591 
592 /* This is the Right Way to get a module: if it fails, it's being removed,
593  * so pretend it's not there. */
594 extern bool try_module_get(struct module *module);
595 
596 extern void module_put(struct module *module);
597 
598 #else /*!CONFIG_MODULE_UNLOAD*/
599 static inline int try_module_get(struct module *module)
600 {
601         return !module || module_is_live(module);
602 }
603 static inline void module_put(struct module *module)
604 {
605 }
606 static inline void __module_get(struct module *module)
607 {
608 }
609 #define symbol_put(x) do { } while (0)
610 #define symbol_put_addr(p) do { } while (0)
611 
612 #endif /* CONFIG_MODULE_UNLOAD */
613 int ref_module(struct module *a, struct module *b);
614 
615 /* This is a #define so the string doesn't get put in every .o file */
616 #define module_name(mod)                        \
617 ({                                              \
618         struct module *__mod = (mod);           \
619         __mod ? __mod->name : "kernel";         \
620 })
621 
622 /* For kallsyms to ask for address resolution.  namebuf should be at
623  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
624  * found, otherwise NULL. */
625 const char *module_address_lookup(unsigned long addr,
626                             unsigned long *symbolsize,
627                             unsigned long *offset,
628                             char **modname,
629                             char *namebuf);
630 int lookup_module_symbol_name(unsigned long addr, char *symname);
631 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
632 
633 /* For extable.c to search modules' exception tables. */
634 const struct exception_table_entry *search_module_extables(unsigned long addr);
635 
636 int register_module_notifier(struct notifier_block *nb);
637 int unregister_module_notifier(struct notifier_block *nb);
638 
639 extern void print_modules(void);
640 
641 static inline bool module_requested_async_probing(struct module *module)
642 {
643         return module && module->async_probe_requested;
644 }
645 
646 #ifdef CONFIG_LIVEPATCH
647 static inline bool is_livepatch_module(struct module *mod)
648 {
649         return mod->klp;
650 }
651 #else /* !CONFIG_LIVEPATCH */
652 static inline bool is_livepatch_module(struct module *mod)
653 {
654         return false;
655 }
656 #endif /* CONFIG_LIVEPATCH */
657 
658 #else /* !CONFIG_MODULES... */
659 
660 /* Given an address, look for it in the exception tables. */
661 static inline const struct exception_table_entry *
662 search_module_extables(unsigned long addr)
663 {
664         return NULL;
665 }
666 
667 static inline struct module *__module_address(unsigned long addr)
668 {
669         return NULL;
670 }
671 
672 static inline struct module *__module_text_address(unsigned long addr)
673 {
674         return NULL;
675 }
676 
677 static inline bool is_module_address(unsigned long addr)
678 {
679         return false;
680 }
681 
682 static inline bool is_module_percpu_address(unsigned long addr)
683 {
684         return false;
685 }
686 
687 static inline bool is_module_text_address(unsigned long addr)
688 {
689         return false;
690 }
691 
692 /* Get/put a kernel symbol (calls should be symmetric) */
693 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
694 #define symbol_put(x) do { } while (0)
695 #define symbol_put_addr(x) do { } while (0)
696 
697 static inline void __module_get(struct module *module)
698 {
699 }
700 
701 static inline int try_module_get(struct module *module)
702 {
703         return 1;
704 }
705 
706 static inline void module_put(struct module *module)
707 {
708 }
709 
710 #define module_name(mod) "kernel"
711 
712 /* For kallsyms to ask for address resolution.  NULL means not found. */
713 static inline const char *module_address_lookup(unsigned long addr,
714                                           unsigned long *symbolsize,
715                                           unsigned long *offset,
716                                           char **modname,
717                                           char *namebuf)
718 {
719         return NULL;
720 }
721 
722 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
723 {
724         return -ERANGE;
725 }
726 
727 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
728 {
729         return -ERANGE;
730 }
731 
732 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
733                                         char *type, char *name,
734                                         char *module_name, int *exported)
735 {
736         return -ERANGE;
737 }
738 
739 static inline unsigned long module_kallsyms_lookup_name(const char *name)
740 {
741         return 0;
742 }
743 
744 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
745                                                            struct module *,
746                                                            unsigned long),
747                                                  void *data)
748 {
749         return 0;
750 }
751 
752 static inline int register_module_notifier(struct notifier_block *nb)
753 {
754         /* no events will happen anyway, so this can always succeed */
755         return 0;
756 }
757 
758 static inline int unregister_module_notifier(struct notifier_block *nb)
759 {
760         return 0;
761 }
762 
763 #define module_put_and_exit(code) do_exit(code)
764 
765 static inline void print_modules(void)
766 {
767 }
768 
769 static inline bool module_requested_async_probing(struct module *module)
770 {
771         return false;
772 }
773 
774 #endif /* CONFIG_MODULES */
775 
776 #ifdef CONFIG_SYSFS
777 extern struct kset *module_kset;
778 extern struct kobj_type module_ktype;
779 extern int module_sysfs_initialized;
780 #endif /* CONFIG_SYSFS */
781 
782 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
783 
784 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
785 
786 #define __MODULE_STRING(x) __stringify(x)
787 
788 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
789 extern void set_all_modules_text_rw(void);
790 extern void set_all_modules_text_ro(void);
791 extern void module_enable_ro(const struct module *mod);
792 extern void module_disable_ro(const struct module *mod);
793 #else
794 static inline void set_all_modules_text_rw(void) { }
795 static inline void set_all_modules_text_ro(void) { }
796 static inline void module_enable_ro(const struct module *mod) { }
797 static inline void module_disable_ro(const struct module *mod) { }
798 #endif
799 
800 #ifdef CONFIG_GENERIC_BUG
801 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
802                          struct module *);
803 void module_bug_cleanup(struct module *);
804 
805 #else   /* !CONFIG_GENERIC_BUG */
806 
807 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
808                                         const Elf_Shdr *sechdrs,
809                                         struct module *mod)
810 {
811 }
812 static inline void module_bug_cleanup(struct module *mod) {}
813 #endif  /* CONFIG_GENERIC_BUG */
814 
815 #ifdef CONFIG_MODULE_SIG
816 static inline bool module_sig_ok(struct module *module)
817 {
818         return module->sig_ok;
819 }
820 #else   /* !CONFIG_MODULE_SIG */
821 static inline bool module_sig_ok(struct module *module)
822 {
823         return true;
824 }
825 #endif  /* CONFIG_MODULE_SIG */
826 
827 #endif /* _LINUX_MODULE_H */
828 

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