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