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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 #include <linux/error-injection.h>
 23 #include <linux/tracepoint-defs.h>
 24 
 25 #include <linux/percpu.h>
 26 #include <asm/module.h>
 27 
 28 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
 29 #define MODULE_SIG_STRING "~Module signature appended~\n"
 30 
 31 /* Not Yet Implemented */
 32 #define MODULE_SUPPORTED_DEVICE(name)
 33 
 34 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
 35 
 36 struct modversion_info {
 37         unsigned long crc;
 38         char name[MODULE_NAME_LEN];
 39 };
 40 
 41 struct module;
 42 struct exception_table_entry;
 43 
 44 struct module_kobject {
 45         struct kobject kobj;
 46         struct module *mod;
 47         struct kobject *drivers_dir;
 48         struct module_param_attrs *mp;
 49         struct completion *kobj_completion;
 50 } __randomize_layout;
 51 
 52 struct module_attribute {
 53         struct attribute attr;
 54         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
 55                         char *);
 56         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
 57                          const char *, size_t count);
 58         void (*setup)(struct module *, const char *);
 59         int (*test)(struct module *);
 60         void (*free)(struct module *);
 61 };
 62 
 63 struct module_version_attribute {
 64         struct module_attribute mattr;
 65         const char *module_name;
 66         const char *version;
 67 } __attribute__ ((__aligned__(sizeof(void *))));
 68 
 69 extern ssize_t __modver_version_show(struct module_attribute *,
 70                                      struct module_kobject *, char *);
 71 
 72 extern struct module_attribute module_uevent;
 73 
 74 /* These are either module local, or the kernel's dummy ones. */
 75 extern int init_module(void);
 76 extern void cleanup_module(void);
 77 
 78 #ifndef MODULE
 79 /**
 80  * module_init() - driver initialization entry point
 81  * @x: function to be run at kernel boot time or module insertion
 82  *
 83  * module_init() will either be called during do_initcalls() (if
 84  * builtin) or at module insertion time (if a module).  There can only
 85  * be one per module.
 86  */
 87 #define module_init(x)  __initcall(x);
 88 
 89 /**
 90  * module_exit() - driver exit entry point
 91  * @x: function to be run when driver is removed
 92  *
 93  * module_exit() will wrap the driver clean-up code
 94  * with cleanup_module() when used with rmmod when
 95  * the driver is a module.  If the driver is statically
 96  * compiled into the kernel, module_exit() has no effect.
 97  * There can only be one per module.
 98  */
 99 #define module_exit(x)  __exitcall(x);
100 
101 #else /* MODULE */
102 
103 /*
104  * In most cases loadable modules do not need custom
105  * initcall levels. There are still some valid cases where
106  * a driver may be needed early if built in, and does not
107  * matter when built as a loadable module. Like bus
108  * snooping debug drivers.
109  */
110 #define early_initcall(fn)              module_init(fn)
111 #define core_initcall(fn)               module_init(fn)
112 #define core_initcall_sync(fn)          module_init(fn)
113 #define postcore_initcall(fn)           module_init(fn)
114 #define postcore_initcall_sync(fn)      module_init(fn)
115 #define arch_initcall(fn)               module_init(fn)
116 #define subsys_initcall(fn)             module_init(fn)
117 #define subsys_initcall_sync(fn)        module_init(fn)
118 #define fs_initcall(fn)                 module_init(fn)
119 #define fs_initcall_sync(fn)            module_init(fn)
120 #define rootfs_initcall(fn)             module_init(fn)
121 #define device_initcall(fn)             module_init(fn)
122 #define device_initcall_sync(fn)        module_init(fn)
123 #define late_initcall(fn)               module_init(fn)
124 #define late_initcall_sync(fn)          module_init(fn)
125 
126 #define console_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(__stringify(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         /* Kernel parameters. */
351 #ifdef CONFIG_SYSFS
352         struct mutex param_lock;
353 #endif
354         struct kernel_param *kp;
355         unsigned int num_kp;
356 
357         /* GPL-only exported symbols. */
358         unsigned int num_gpl_syms;
359         const struct kernel_symbol *gpl_syms;
360         const s32 *gpl_crcs;
361 
362 #ifdef CONFIG_UNUSED_SYMBOLS
363         /* unused exported symbols. */
364         const struct kernel_symbol *unused_syms;
365         const s32 *unused_crcs;
366         unsigned int num_unused_syms;
367 
368         /* GPL-only, unused exported symbols. */
369         unsigned int num_unused_gpl_syms;
370         const struct kernel_symbol *unused_gpl_syms;
371         const s32 *unused_gpl_crcs;
372 #endif
373 
374 #ifdef CONFIG_MODULE_SIG
375         /* Signature was verified. */
376         bool sig_ok;
377 #endif
378 
379         bool async_probe_requested;
380 
381         /* symbols that will be GPL-only in the near future. */
382         const struct kernel_symbol *gpl_future_syms;
383         const s32 *gpl_future_crcs;
384         unsigned int num_gpl_future_syms;
385 
386         /* Exception table */
387         unsigned int num_exentries;
388         struct exception_table_entry *extable;
389 
390         /* Startup function. */
391         int (*init)(void);
392 
393         /* Core layout: rbtree is accessed frequently, so keep together. */
394         struct module_layout core_layout __module_layout_align;
395         struct module_layout init_layout;
396 
397         /* Arch-specific module values */
398         struct mod_arch_specific arch;
399 
400         unsigned long taints;   /* same bits as kernel:taint_flags */
401 
402 #ifdef CONFIG_GENERIC_BUG
403         /* Support for BUG */
404         unsigned num_bugs;
405         struct list_head bug_list;
406         struct bug_entry *bug_table;
407 #endif
408 
409 #ifdef CONFIG_KALLSYMS
410         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
411         struct mod_kallsyms *kallsyms;
412         struct mod_kallsyms core_kallsyms;
413 
414         /* Section attributes */
415         struct module_sect_attrs *sect_attrs;
416 
417         /* Notes attributes */
418         struct module_notes_attrs *notes_attrs;
419 #endif
420 
421         /* The command line arguments (may be mangled).  People like
422            keeping pointers to this stuff */
423         char *args;
424 
425 #ifdef CONFIG_SMP
426         /* Per-cpu data. */
427         void __percpu *percpu;
428         unsigned int percpu_size;
429 #endif
430 
431 #ifdef CONFIG_TRACEPOINTS
432         unsigned int num_tracepoints;
433         tracepoint_ptr_t *tracepoints_ptrs;
434 #endif
435 #ifdef HAVE_JUMP_LABEL
436         struct jump_entry *jump_entries;
437         unsigned int num_jump_entries;
438 #endif
439 #ifdef CONFIG_TRACING
440         unsigned int num_trace_bprintk_fmt;
441         const char **trace_bprintk_fmt_start;
442 #endif
443 #ifdef CONFIG_EVENT_TRACING
444         struct trace_event_call **trace_events;
445         unsigned int num_trace_events;
446         struct trace_eval_map **trace_evals;
447         unsigned int num_trace_evals;
448 #endif
449 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
450         unsigned int num_ftrace_callsites;
451         unsigned long *ftrace_callsites;
452 #endif
453 
454 #ifdef CONFIG_LIVEPATCH
455         bool klp; /* Is this a livepatch module? */
456         bool klp_alive;
457 
458         /* Elf information */
459         struct klp_modinfo *klp_info;
460 #endif
461 
462 #ifdef CONFIG_MODULE_UNLOAD
463         /* What modules depend on me? */
464         struct list_head source_list;
465         /* What modules do I depend on? */
466         struct list_head target_list;
467 
468         /* Destruction function. */
469         void (*exit)(void);
470 
471         atomic_t refcnt;
472 #endif
473 
474 #ifdef CONFIG_CONSTRUCTORS
475         /* Constructor functions. */
476         ctor_fn_t *ctors;
477         unsigned int num_ctors;
478 #endif
479 
480 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
481         struct error_injection_entry *ei_funcs;
482         unsigned int num_ei_funcs;
483 #endif
484 } ____cacheline_aligned __randomize_layout;
485 #ifndef MODULE_ARCH_INIT
486 #define MODULE_ARCH_INIT {}
487 #endif
488 
489 extern struct mutex module_mutex;
490 
491 /* FIXME: It'd be nice to isolate modules during init, too, so they
492    aren't used before they (may) fail.  But presently too much code
493    (IDE & SCSI) require entry into the module during init.*/
494 static inline bool module_is_live(struct module *mod)
495 {
496         return mod->state != MODULE_STATE_GOING;
497 }
498 
499 struct module *__module_text_address(unsigned long addr);
500 struct module *__module_address(unsigned long addr);
501 bool is_module_address(unsigned long addr);
502 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
503 bool is_module_percpu_address(unsigned long addr);
504 bool is_module_text_address(unsigned long addr);
505 
506 static inline bool within_module_core(unsigned long addr,
507                                       const struct module *mod)
508 {
509         return (unsigned long)mod->core_layout.base <= addr &&
510                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
511 }
512 
513 static inline bool within_module_init(unsigned long addr,
514                                       const struct module *mod)
515 {
516         return (unsigned long)mod->init_layout.base <= addr &&
517                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
518 }
519 
520 static inline bool within_module(unsigned long addr, const struct module *mod)
521 {
522         return within_module_init(addr, mod) || within_module_core(addr, mod);
523 }
524 
525 /* Search for module by name: must hold module_mutex. */
526 struct module *find_module(const char *name);
527 
528 struct symsearch {
529         const struct kernel_symbol *start, *stop;
530         const s32 *crcs;
531         enum {
532                 NOT_GPL_ONLY,
533                 GPL_ONLY,
534                 WILL_BE_GPL_ONLY,
535         } licence;
536         bool unused;
537 };
538 
539 /*
540  * Search for an exported symbol by name.
541  *
542  * Must be called with module_mutex held or preemption disabled.
543  */
544 const struct kernel_symbol *find_symbol(const char *name,
545                                         struct module **owner,
546                                         const s32 **crc,
547                                         bool gplok,
548                                         bool warn);
549 
550 /*
551  * Walk the exported symbol table
552  *
553  * Must be called with module_mutex held or preemption disabled.
554  */
555 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
556                                     struct module *owner,
557                                     void *data), void *data);
558 
559 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
560    symnum out of range. */
561 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
562                         char *name, char *module_name, int *exported);
563 
564 /* Look for this name: can be of form module:name. */
565 unsigned long module_kallsyms_lookup_name(const char *name);
566 
567 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
568                                              struct module *, unsigned long),
569                                    void *data);
570 
571 extern void __noreturn __module_put_and_exit(struct module *mod,
572                         long code);
573 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
574 
575 #ifdef CONFIG_MODULE_UNLOAD
576 int module_refcount(struct module *mod);
577 void __symbol_put(const char *symbol);
578 #define symbol_put(x) __symbol_put(__stringify(x))
579 void symbol_put_addr(void *addr);
580 
581 /* Sometimes we know we already have a refcount, and it's easier not
582    to handle the error case (which only happens with rmmod --wait). */
583 extern void __module_get(struct module *module);
584 
585 /* This is the Right Way to get a module: if it fails, it's being removed,
586  * so pretend it's not there. */
587 extern bool try_module_get(struct module *module);
588 
589 extern void module_put(struct module *module);
590 
591 #else /*!CONFIG_MODULE_UNLOAD*/
592 static inline bool try_module_get(struct module *module)
593 {
594         return !module || module_is_live(module);
595 }
596 static inline void module_put(struct module *module)
597 {
598 }
599 static inline void __module_get(struct module *module)
600 {
601 }
602 #define symbol_put(x) do { } while (0)
603 #define symbol_put_addr(p) do { } while (0)
604 
605 #endif /* CONFIG_MODULE_UNLOAD */
606 int ref_module(struct module *a, struct module *b);
607 
608 /* This is a #define so the string doesn't get put in every .o file */
609 #define module_name(mod)                        \
610 ({                                              \
611         struct module *__mod = (mod);           \
612         __mod ? __mod->name : "kernel";         \
613 })
614 
615 /* Dereference module function descriptor */
616 void *dereference_module_function_descriptor(struct module *mod, void *ptr);
617 
618 /* For kallsyms to ask for address resolution.  namebuf should be at
619  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
620  * found, otherwise NULL. */
621 const char *module_address_lookup(unsigned long addr,
622                             unsigned long *symbolsize,
623                             unsigned long *offset,
624                             char **modname,
625                             char *namebuf);
626 int lookup_module_symbol_name(unsigned long addr, char *symname);
627 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
628 
629 int register_module_notifier(struct notifier_block *nb);
630 int unregister_module_notifier(struct notifier_block *nb);
631 
632 extern void print_modules(void);
633 
634 static inline bool module_requested_async_probing(struct module *module)
635 {
636         return module && module->async_probe_requested;
637 }
638 
639 #ifdef CONFIG_LIVEPATCH
640 static inline bool is_livepatch_module(struct module *mod)
641 {
642         return mod->klp;
643 }
644 #else /* !CONFIG_LIVEPATCH */
645 static inline bool is_livepatch_module(struct module *mod)
646 {
647         return false;
648 }
649 #endif /* CONFIG_LIVEPATCH */
650 
651 bool is_module_sig_enforced(void);
652 
653 #else /* !CONFIG_MODULES... */
654 
655 static inline struct module *__module_address(unsigned long addr)
656 {
657         return NULL;
658 }
659 
660 static inline struct module *__module_text_address(unsigned long addr)
661 {
662         return NULL;
663 }
664 
665 static inline bool is_module_address(unsigned long addr)
666 {
667         return false;
668 }
669 
670 static inline bool is_module_percpu_address(unsigned long addr)
671 {
672         return false;
673 }
674 
675 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
676 {
677         return false;
678 }
679 
680 static inline bool is_module_text_address(unsigned long addr)
681 {
682         return false;
683 }
684 
685 /* Get/put a kernel symbol (calls should be symmetric) */
686 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
687 #define symbol_put(x) do { } while (0)
688 #define symbol_put_addr(x) do { } while (0)
689 
690 static inline void __module_get(struct module *module)
691 {
692 }
693 
694 static inline bool try_module_get(struct module *module)
695 {
696         return true;
697 }
698 
699 static inline void module_put(struct module *module)
700 {
701 }
702 
703 #define module_name(mod) "kernel"
704 
705 /* For kallsyms to ask for address resolution.  NULL means not found. */
706 static inline const char *module_address_lookup(unsigned long addr,
707                                           unsigned long *symbolsize,
708                                           unsigned long *offset,
709                                           char **modname,
710                                           char *namebuf)
711 {
712         return NULL;
713 }
714 
715 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
716 {
717         return -ERANGE;
718 }
719 
720 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
721 {
722         return -ERANGE;
723 }
724 
725 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
726                                         char *type, char *name,
727                                         char *module_name, int *exported)
728 {
729         return -ERANGE;
730 }
731 
732 static inline unsigned long module_kallsyms_lookup_name(const char *name)
733 {
734         return 0;
735 }
736 
737 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
738                                                            struct module *,
739                                                            unsigned long),
740                                                  void *data)
741 {
742         return 0;
743 }
744 
745 static inline int register_module_notifier(struct notifier_block *nb)
746 {
747         /* no events will happen anyway, so this can always succeed */
748         return 0;
749 }
750 
751 static inline int unregister_module_notifier(struct notifier_block *nb)
752 {
753         return 0;
754 }
755 
756 #define module_put_and_exit(code) do_exit(code)
757 
758 static inline void print_modules(void)
759 {
760 }
761 
762 static inline bool module_requested_async_probing(struct module *module)
763 {
764         return false;
765 }
766 
767 static inline bool is_module_sig_enforced(void)
768 {
769         return false;
770 }
771 
772 /* Dereference module function descriptor */
773 static inline
774 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
775 {
776         return ptr;
777 }
778 
779 #endif /* CONFIG_MODULES */
780 
781 #ifdef CONFIG_SYSFS
782 extern struct kset *module_kset;
783 extern struct kobj_type module_ktype;
784 extern int module_sysfs_initialized;
785 #endif /* CONFIG_SYSFS */
786 
787 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
788 
789 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
790 
791 #define __MODULE_STRING(x) __stringify(x)
792 
793 #ifdef CONFIG_STRICT_MODULE_RWX
794 extern void set_all_modules_text_rw(void);
795 extern void set_all_modules_text_ro(void);
796 extern void module_enable_ro(const struct module *mod, bool after_init);
797 extern void module_disable_ro(const struct module *mod);
798 #else
799 static inline void set_all_modules_text_rw(void) { }
800 static inline void set_all_modules_text_ro(void) { }
801 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
802 static inline void module_disable_ro(const struct module *mod) { }
803 #endif
804 
805 #ifdef CONFIG_GENERIC_BUG
806 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
807                          struct module *);
808 void module_bug_cleanup(struct module *);
809 
810 #else   /* !CONFIG_GENERIC_BUG */
811 
812 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
813                                         const Elf_Shdr *sechdrs,
814                                         struct module *mod)
815 {
816 }
817 static inline void module_bug_cleanup(struct module *mod) {}
818 #endif  /* CONFIG_GENERIC_BUG */
819 
820 #ifdef CONFIG_RETPOLINE
821 extern bool retpoline_module_ok(bool has_retpoline);
822 #else
823 static inline bool retpoline_module_ok(bool has_retpoline)
824 {
825         return true;
826 }
827 #endif
828 
829 #ifdef CONFIG_MODULE_SIG
830 static inline bool module_sig_ok(struct module *module)
831 {
832         return module->sig_ok;
833 }
834 #else   /* !CONFIG_MODULE_SIG */
835 static inline bool module_sig_ok(struct module *module)
836 {
837         return true;
838 }
839 #endif  /* CONFIG_MODULE_SIG */
840 
841 #endif /* _LINUX_MODULE_H */
842 

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