kernel/params.c

   1 /* Helpers for initial module or kernel cmdline parsing
   2    Copyright (C) 2001 Rusty Russell.
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17 */
  18 #include <linux/moduleparam.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/module.h>
  23 #include <linux/device.h>
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26 #include <linux/ctype.h>
  27
  28 #if 0
  29 #define DEBUGP printk
  30 #else
  31 #define DEBUGP(fmt, a...)
  32 #endif
  33
  34 static inline char dash2underscore(char c)
  35 {
  36         if (c == '-')
  37                 return '_';
  38         return c;
  39 }
  40
  41 static inline int parameq(const char *input, const char *paramname)
  42 {
  43         unsigned int i;
  44         for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)
  45                 if (input[i] == '\0')
  46                         return 1;
  47         return 0;
  48 }
  49
  50 static int parse_one(char *param,
  51                      char *val,
  52                      struct kernel_param *params,
  53                      unsigned num_params,
  54                      int (*handle_unknown)(char *param, char *val))
  55 {
  56         unsigned int i;
  57
  58         /* Find parameter */
  59         for (i = 0; i < num_params; i++) {
  60                 if (parameq(param, params[i].name)) {
  61                         DEBUGP("They are equal!  Calling %p\n",
  62                                params[i].set);
  63                         return params[i].set(val, &params[i]);
  64                 }
  65         }
  66
  67         if (handle_unknown) {
  68                 DEBUGP("Unknown argument: calling %p\n", handle_unknown);
  69                 return handle_unknown(param, val);
  70         }
  71
  72         DEBUGP("Unknown argument `%s'\n", param);
  73         return -ENOENT;
  74 }
  75
  76 /* You can use " around spaces, but can't escape ". */
  77 /* Hyphens and underscores equivalent in parameter names. */
  78 static char *next_arg(char *args, char **param, char **val)
  79 {
  80         unsigned int i, equals = 0;
  81         int in_quote = 0, quoted = 0;
  82         char *next;
  83
  84         if (*args == '"') {
  85                 args++;
  86                 in_quote = 1;
  87                 quoted = 1;
  88         }
  89
  90         for (i = 0; args[i]; i++) {
  91                 if (isspace(args[i]) && !in_quote)
  92                         break;
  93                 if (equals == 0) {
  94                         if (args[i] == '=')
  95                                 equals = i;
  96                 }
  97                 if (args[i] == '"')
  98                         in_quote = !in_quote;
  99         }
 100
 101         *param = args;
 102         if (!equals)
 103                 *val = NULL;
 104         else {
 105                 args[equals] = '\0';
 106                 *val = args + equals + 1;
 107
 108                 /* Don't include quotes in value. */
 109                 if (**val == '"') {
 110                         (*val)++;
 111                         if (args[i-1] == '"')
 112                                 args[i-1] = '\0';
 113                 }
 114                 if (quoted && args[i-1] == '"')
 115                         args[i-1] = '\0';
 116         }
 117
 118         if (args[i]) {
 119                 args[i] = '\0';
 120                 next = args + i + 1;
 121         } else
 122                 next = args + i;
 123
 124         /* Chew up trailing spaces. */
 125         while (isspace(*next))
 126                 next++;
 127         return next;
 128 }
 129
 130 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
 131 int parse_args(const char *name,
 132                char *args,
 133                struct kernel_param *params,
 134                unsigned num,
 135                int (*unknown)(char *param, char *val))
 136 {
 137         char *param, *val;
 138
 139         DEBUGP("Parsing ARGS: %s\n", args);
 140
 141         /* Chew leading spaces */
 142         while (isspace(*args))
 143                 args++;
 144
 145         while (*args) {
 146                 int ret;
 147                 int irq_was_disabled;
 148
 149                 args = next_arg(args, &param, &val);
 150                 irq_was_disabled = irqs_disabled();
 151                 ret = parse_one(param, val, params, num, unknown);
 152                 if (irq_was_disabled && !irqs_disabled()) {
 153                         printk(KERN_WARNING "parse_args(): option '%s' enabled "
 154                                         "irq's!\n", param);
 155                 }
 156                 switch (ret) {
 157                 case -ENOENT:
 158                         printk(KERN_ERR "%s: Unknown parameter `%s'\n",
 159                                name, param);
 160                         return ret;
 161                 case -ENOSPC:
 162                         printk(KERN_ERR
 163                                "%s: `%s' too large for parameter `%s'\n",
 164                                name, val ?: "", param);
 165                         return ret;
 166                 case 0:
 167                         break;
 168                 default:
 169                         printk(KERN_ERR
 170                                "%s: `%s' invalid for parameter `%s'\n",
 171                                name, val ?: "", param);
 172                         return ret;
 173                 }
 174         }
 175
 176         /* All parsed OK. */
 177         return 0;
 178 }
 179
 180 /* Lazy bastard, eh? */
 181 #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn)       \
 182         int param_set_##name(const char *val, struct kernel_param *kp)  \
 183         {                                                               \
 184                 tmptype l;                                              \
 185                 int ret;                                                \
 186                                                                         \
 187                 if (!val) return -EINVAL;                               \
 188                 ret = strtolfn(val, 0, &l);                             \
 189                 if (ret == -EINVAL || ((type)l != l))                   \
 190                         return -EINVAL;                                 \
 191                 *((type *)kp->arg) = l;                                 \
 192                 return 0;                                               \
 193         }                                                               \
 194         int param_get_##name(char *buffer, struct kernel_param *kp)     \
 195         {                                                               \
 196                 return sprintf(buffer, format, *((type *)kp->arg));     \
 197         }
 198
 199 STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
 200 STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
 201 STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
 202 STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
 203 STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
 204 STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
 205 STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
 206
 207 int param_set_charp(const char *val, struct kernel_param *kp)
 208 {
 209         if (!val) {
 210                 printk(KERN_ERR "%s: string parameter expected\n",
 211                        kp->name);
 212                 return -EINVAL;
 213         }
 214
 215         if (strlen(val) > 1024) {
 216                 printk(KERN_ERR "%s: string parameter too long\n",
 217                        kp->name);
 218                 return -ENOSPC;
 219         }
 220
 221         /* This is a hack.  We can't need to strdup in early boot, and we
 222          * don't need to; this mangled commandline is preserved. */
 223         if (slab_is_available()) {
 224                 *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
 225                 if (!*(char **)kp->arg)
 226                         return -ENOMEM;
 227         } else
 228                 *(const char **)kp->arg = val;
 229
 230         return 0;
 231 }
 232
 233 int param_get_charp(char *buffer, struct kernel_param *kp)
 234 {
 235         return sprintf(buffer, "%s", *((char **)kp->arg));
 236 }
 237
 238 /* Actually could be a bool or an int, for historical reasons. */
 239 int param_set_bool(const char *val, struct kernel_param *kp)
 240 {
 241         bool v;
 242
 243         /* No equals means "set"... */
 244         if (!val) val = "1";
 245
 246         /* One of =[yYnN01] */
 247         switch (val[0]) {
 248         case 'y': case 'Y': case '1':
 249                 v = true;
 250                 break;
 251         case 'n': case 'N': case '0':
 252                 v = false;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257
 258         if (kp->flags & KPARAM_ISBOOL)
 259                 *(bool *)kp->arg = v;
 260         else
 261                 *(int *)kp->arg = v;
 262         return 0;
 263 }
 264
 265 int param_get_bool(char *buffer, struct kernel_param *kp)
 266 {
 267         bool val;
 268         if (kp->flags & KPARAM_ISBOOL)
 269                 val = *(bool *)kp->arg;
 270         else
 271                 val = *(int *)kp->arg;
 272
 273         /* Y and N chosen as being relatively non-coder friendly */
 274         return sprintf(buffer, "%c", val ? 'Y' : 'N');
 275 }
 276
 277 /* This one must be bool. */
 278 int param_set_invbool(const char *val, struct kernel_param *kp)
 279 {
 280         int ret;
 281         bool boolval;
 282         struct kernel_param dummy;
 283
 284         dummy.arg = &boolval;
 285         dummy.flags = KPARAM_ISBOOL;
 286         ret = param_set_bool(val, &dummy);
 287         if (ret == 0)
 288                 *(bool *)kp->arg = !boolval;
 289         return ret;
 290 }
 291
 292 int param_get_invbool(char *buffer, struct kernel_param *kp)
 293 {
 294         return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
 295 }
 296
 297 /* We break the rule and mangle the string. */
 298 static int param_array(const char *name,
 299                        const char *val,
 300                        unsigned int min, unsigned int max,
 301                        void *elem, int elemsize,
 302                        int (*set)(const char *, struct kernel_param *kp),
 303                        u16 flags,
 304                        unsigned int *num)
 305 {
 306         int ret;
 307         struct kernel_param kp;
 308         char save;
 309
 310         /* Get the name right for errors. */
 311         kp.name = name;
 312         kp.arg = elem;
 313         kp.flags = flags;
 314
 315         /* No equals sign? */
 316         if (!val) {
 317                 printk(KERN_ERR "%s: expects arguments\n", name);
 318                 return -EINVAL;
 319         }
 320
 321         *num = 0;
 322         /* We expect a comma-separated list of values. */
 323         do {
 324                 int len;
 325
 326                 if (*num == max) {
 327                         printk(KERN_ERR "%s: can only take %i arguments\n",
 328                                name, max);
 329                         return -EINVAL;
 330                 }
 331                 len = strcspn(val, ",");
 332
 333                 /* nul-terminate and parse */
 334                 save = val[len];
 335                 ((char *)val)[len] = '\0';
 336                 ret = set(val, &kp);
 337
 338                 if (ret != 0)
 339                         return ret;
 340                 kp.arg += elemsize;
 341                 val += len+1;
 342                 (*num)++;
 343         } while (save == ',');
 344
 345         if (*num < min) {
 346                 printk(KERN_ERR "%s: needs at least %i arguments\n",
 347                        name, min);
 348                 return -EINVAL;
 349         }
 350         return 0;
 351 }
 352
 353 int param_array_set(const char *val, struct kernel_param *kp)
 354 {
 355         const struct kparam_array *arr = kp->arr;
 356         unsigned int temp_num;
 357
 358         return param_array(kp->name, val, 1, arr->max, arr->elem,
 359                            arr->elemsize, arr->set, kp->flags,
 360                            arr->num ?: &temp_num);
 361 }
 362
 363 int param_array_get(char *buffer, struct kernel_param *kp)
 364 {
 365         int i, off, ret;
 366         const struct kparam_array *arr = kp->arr;
 367         struct kernel_param p;
 368
 369         p = *kp;
 370         for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
 371                 if (i)
 372                         buffer[off++] = ',';
 373                 p.arg = arr->elem + arr->elemsize * i;
 374                 ret = arr->get(buffer + off, &p);
 375                 if (ret < 0)
 376                         return ret;
 377                 off += ret;
 378         }
 379         buffer[off] = '\0';
 380         return off;
 381 }
 382
 383 int param_set_copystring(const char *val, struct kernel_param *kp)
 384 {
 385         const struct kparam_string *kps = kp->str;
 386
 387         if (!val) {
 388                 printk(KERN_ERR "%s: missing param set value\n", kp->name);
 389                 return -EINVAL;
 390         }
 391         if (strlen(val)+1 > kps->maxlen) {
 392                 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
 393                        kp->name, kps->maxlen-1);
 394                 return -ENOSPC;
 395         }
 396         strcpy(kps->string, val);
 397         return 0;
 398 }
 399
 400 int param_get_string(char *buffer, struct kernel_param *kp)
 401 {
 402         const struct kparam_string *kps = kp->str;
 403         return strlcpy(buffer, kps->string, kps->maxlen);
 404 }
 405
 406 /* sysfs output in /sys/modules/XYZ/parameters/ */
 407 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
 408 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
 409
 410 extern struct kernel_param __start___param[], __stop___param[];
 411
 412 struct param_attribute
 413 {
 414         struct module_attribute mattr;
 415         struct kernel_param *param;
 416 };
 417
 418 struct module_param_attrs
 419 {
 420         unsigned int num;
 421         struct attribute_group grp;
 422         struct param_attribute attrs[0];
 423 };
 424
 425 #ifdef CONFIG_SYSFS
 426 #define to_param_attr(n) container_of(n, struct param_attribute, mattr);
 427
 428 static ssize_t param_attr_show(struct module_attribute *mattr,
 429                                struct module *mod, char *buf)
 430 {
 431         int count;
 432         struct param_attribute *attribute = to_param_attr(mattr);
 433
 434         if (!attribute->param->get)
 435                 return -EPERM;
 436
 437         count = attribute->param->get(buf, attribute->param);
 438         if (count > 0) {
 439                 strcat(buf, "\n");
 440                 ++count;
 441         }
 442         return count;
 443 }
 444
 445 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
 446 static ssize_t param_attr_store(struct module_attribute *mattr,
 447                                 struct module *owner,
 448                                 const char *buf, size_t len)
 449 {
 450         int err;
 451         struct param_attribute *attribute = to_param_attr(mattr);
 452
 453         if (!attribute->param->set)
 454                 return -EPERM;
 455
 456         err = attribute->param->set(buf, attribute->param);
 457         if (!err)
 458                 return len;
 459         return err;
 460 }
 461 #endif
 462
 463 #ifdef CONFIG_MODULES
 464 #define __modinit
 465 #else
 466 #define __modinit __init
 467 #endif
 468
 469 #ifdef CONFIG_SYSFS
 470 /*
 471  * add_sysfs_param - add a parameter to sysfs
 472  * @mk: struct module_kobject
 473  * @kparam: the actual parameter definition to add to sysfs
 474  * @name: name of parameter
 475  *
 476  * Create a kobject if for a (per-module) parameter if mp NULL, and
 477  * create file in sysfs.  Returns an error on out of memory.  Always cleans up
 478  * if there's an error.
 479  */
 480 static __modinit int add_sysfs_param(struct module_kobject *mk,
 481                                      struct kernel_param *kp,
 482                                      const char *name)
 483 {
 484         struct module_param_attrs *new;
 485         struct attribute **attrs;
 486         int err, num;
 487
 488         /* We don't bother calling this with invisible parameters. */
 489         BUG_ON(!kp->perm);
 490
 491         if (!mk->mp) {
 492                 num = 0;
 493                 attrs = NULL;
 494         } else {
 495                 num = mk->mp->num;
 496                 attrs = mk->mp->grp.attrs;
 497         }
 498
 499         /* Enlarge. */
 500         new = krealloc(mk->mp,
 501                        sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
 502                        GFP_KERNEL);
 503         if (!new) {
 504                 kfree(mk->mp);
 505                 err = -ENOMEM;
 506                 goto fail;
 507         }
 508         attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
 509         if (!attrs) {
 510                 err = -ENOMEM;
 511                 goto fail_free_new;
 512         }
 513
 514         /* Sysfs wants everything zeroed. */
 515         memset(new, 0, sizeof(*new));
 516         memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
 517         memset(&attrs[num], 0, sizeof(attrs[num]));
 518         new->grp.name = "parameters";
 519         new->grp.attrs = attrs;
 520
 521         /* Tack new one on the end. */
 522         new->attrs[num].param = kp;
 523         new->attrs[num].mattr.show = param_attr_show;
 524         new->attrs[num].mattr.store = param_attr_store;
 525         new->attrs[num].mattr.attr.name = (char *)name;
 526         new->attrs[num].mattr.attr.mode = kp->perm;
 527         new->num = num+1;
 528
 529         /* Fix up all the pointers, since krealloc can move us */
 530         for (num = 0; num < new->num; num++)
 531                 new->grp.attrs[num] = &new->attrs[num].mattr.attr;
 532         new->grp.attrs[num] = NULL;
 533
 534         mk->mp = new;
 535         return 0;
 536
 537 fail_free_new:
 538         kfree(new);
 539 fail:
 540         mk->mp = NULL;
 541         return err;
 542 }
 543
 544 #ifdef CONFIG_MODULES
 545 static void free_module_param_attrs(struct module_kobject *mk)
 546 {
 547         kfree(mk->mp->grp.attrs);
 548         kfree(mk->mp);
 549         mk->mp = NULL;
 550 }
 551
 552 /*
 553  * module_param_sysfs_setup - setup sysfs support for one module
 554  * @mod: module
 555  * @kparam: module parameters (array)
 556  * @num_params: number of module parameters
 557  *
 558  * Adds sysfs entries for module parameters under
 559  * /sys/module/[mod->name]/parameters/
 560  */
 561 int module_param_sysfs_setup(struct module *mod,
 562                              struct kernel_param *kparam,
 563                              unsigned int num_params)
 564 {
 565         int i, err;
 566         bool params = false;
 567
 568         for (i = 0; i < num_params; i++) {
 569                 if (kparam[i].perm == 0)
 570                         continue;
 571                 err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
 572                 if (err)
 573                         return err;
 574                 params = true;
 575         }
 576
 577         if (!params)
 578                 return 0;
 579
 580         /* Create the param group. */
 581         err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
 582         if (err)
 583                 free_module_param_attrs(&mod->mkobj);
 584         return err;
 585 }
 586
 587 /*
 588  * module_param_sysfs_remove - remove sysfs support for one module
 589  * @mod: module
 590  *
 591  * Remove sysfs entries for module parameters and the corresponding
 592  * kobject.
 593  */
 594 void module_param_sysfs_remove(struct module *mod)
 595 {
 596         if (mod->mkobj.mp) {
 597                 sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
 598                 /* We are positive that no one is using any param
 599                  * attrs at this point.  Deallocate immediately. */
 600                 free_module_param_attrs(&mod->mkobj);
 601         }
 602 }
 603 #endif
 604
 605 void destroy_params(const struct kernel_param *params, unsigned num)
 606 {
 607         /* FIXME: This should free kmalloced charp parameters.  It doesn't. */
 608 }
 609
 610 static void __init kernel_add_sysfs_param(const char *name,
 611                                           struct kernel_param *kparam,
 612                                           unsigned int name_skip)
 613 {
 614         struct module_kobject *mk;
 615         struct kobject *kobj;
 616         int err;
 617
 618         kobj = kset_find_obj(module_kset, name);
 619         if (kobj) {
 620                 /* We already have one.  Remove params so we can add more. */
 621                 mk = to_module_kobject(kobj);
 622                 /* We need to remove it before adding parameters. */
 623                 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
 624         } else {
 625                 mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
 626                 BUG_ON(!mk);
 627
 628                 mk->mod = THIS_MODULE;
 629                 mk->kobj.kset = module_kset;
 630                 err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
 631                                            "%s", name);
 632                 if (err) {
 633                         kobject_put(&mk->kobj);
 634                         printk(KERN_ERR "Module '%s' failed add to sysfs, "
 635                                "error number %d\n", name, err);
 636                         printk(KERN_ERR "The system will be unstable now.\n");
 637                         return;
 638                 }
 639                 /* So that exit path is even. */
 640                 kobject_get(&mk->kobj);
 641         }
 642
 643         /* These should not fail at boot. */
 644         err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
 645         BUG_ON(err);
 646         err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
 647         BUG_ON(err);
 648         kobject_uevent(&mk->kobj, KOBJ_ADD);
 649         kobject_put(&mk->kobj);
 650 }
 651
 652 /*
 653  * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
 654  *
 655  * Add module_parameters to sysfs for "modules" built into the kernel.
 656  *
 657  * The "module" name (KBUILD_MODNAME) is stored before a dot, the
 658  * "parameter" name is stored behind a dot in kernel_param->name. So,
 659  * extract the "module" name for all built-in kernel_param-eters,
 660  * and for all who have the same, call kernel_add_sysfs_param.
 661  */
 662 static void __init param_sysfs_builtin(void)
 663 {
 664         struct kernel_param *kp;
 665         unsigned int name_len;
 666         char modname[MODULE_NAME_LEN];
 667
 668         for (kp = __start___param; kp < __stop___param; kp++) {
 669                 char *dot;
 670
 671                 if (kp->perm == 0)
 672                         continue;
 673
 674                 dot = strchr(kp->name, '.');
 675                 if (!dot) {
 676                         /* This happens for core_param() */
 677                         strcpy(modname, "kernel");
 678                         name_len = 0;
 679                 } else {
 680                         name_len = dot - kp->name + 1;
 681                         strlcpy(modname, kp->name, name_len);
 682                 }
 683                 kernel_add_sysfs_param(modname, kp, name_len);
 684         }
 685 }
 686
 687
 688 /* module-related sysfs stuff */
 689
 690 static ssize_t module_attr_show(struct kobject *kobj,
 691                                 struct attribute *attr,
 692                                 char *buf)
 693 {
 694         struct module_attribute *attribute;
 695         struct module_kobject *mk;
 696         int ret;
 697
 698         attribute = to_module_attr(attr);
 699         mk = to_module_kobject(kobj);
 700
 701         if (!attribute->show)
 702                 return -EIO;
 703
 704         ret = attribute->show(attribute, mk->mod, buf);
 705
 706         return ret;
 707 }
 708
 709 static ssize_t module_attr_store(struct kobject *kobj,
 710                                 struct attribute *attr,
 711                                 const char *buf, size_t len)
 712 {
 713         struct module_attribute *attribute;
 714         struct module_kobject *mk;
 715         int ret;
 716
 717         attribute = to_module_attr(attr);
 718         mk = to_module_kobject(kobj);
 719
 720         if (!attribute->store)
 721                 return -EIO;
 722
 723         ret = attribute->store(attribute, mk->mod, buf, len);
 724
 725         return ret;
 726 }
 727
 728 static struct sysfs_ops module_sysfs_ops = {
 729         .show = module_attr_show,
 730         .store = module_attr_store,
 731 };
 732
 733 static int uevent_filter(struct kset *kset, struct kobject *kobj)
 734 {
 735         struct kobj_type *ktype = get_ktype(kobj);
 736
 737         if (ktype == &module_ktype)
 738                 return 1;
 739         return 0;
 740 }
 741
 742 static struct kset_uevent_ops module_uevent_ops = {
 743         .filter = uevent_filter,
 744 };
 745
 746 struct kset *module_kset;
 747 int module_sysfs_initialized;
 748
 749 struct kobj_type module_ktype = {
 750         .sysfs_ops =    &module_sysfs_ops,
 751 };
 752
 753 /*
 754  * param_sysfs_init - wrapper for built-in params support
 755  */
 756 static int __init param_sysfs_init(void)
 757 {
 758         module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
 759         if (!module_kset) {
 760                 printk(KERN_WARNING "%s (%d): error creating kset\n",
 761                         __FILE__, __LINE__);
 762                 return -ENOMEM;
 763         }
 764         module_sysfs_initialized = 1;
 765
 766         param_sysfs_builtin();
 767
 768         return 0;
 769 }
 770 subsys_initcall(param_sysfs_init);
 771
 772 #endif /* CONFIG_SYSFS */
 773
 774 EXPORT_SYMBOL(param_set_byte);
 775 EXPORT_SYMBOL(param_get_byte);
 776 EXPORT_SYMBOL(param_set_short);
 777 EXPORT_SYMBOL(param_get_short);
 778 EXPORT_SYMBOL(param_set_ushort);
 779 EXPORT_SYMBOL(param_get_ushort);
 780 EXPORT_SYMBOL(param_set_int);
 781 EXPORT_SYMBOL(param_get_int);
 782 EXPORT_SYMBOL(param_set_uint);
 783 EXPORT_SYMBOL(param_get_uint);
 784 EXPORT_SYMBOL(param_set_long);
 785 EXPORT_SYMBOL(param_get_long);
 786 EXPORT_SYMBOL(param_set_ulong);
 787 EXPORT_SYMBOL(param_get_ulong);
 788 EXPORT_SYMBOL(param_set_charp);
 789 EXPORT_SYMBOL(param_get_charp);
 790 EXPORT_SYMBOL(param_set_bool);
 791 EXPORT_SYMBOL(param_get_bool);
 792 EXPORT_SYMBOL(param_set_invbool);
 793 EXPORT_SYMBOL(param_get_invbool);
 794 EXPORT_SYMBOL(param_array_set);
 795 EXPORT_SYMBOL(param_array_get);
 796 EXPORT_SYMBOL(param_set_copystring);
 797 EXPORT_SYMBOL(param_get_string);