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 /* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
  28 #define KPARAM_KMALLOCED        0x80000000
  29
  30 #if 0
  31 #define DEBUGP printk
  32 #else
  33 #define DEBUGP(fmt, a...)
  34 #endif
  35
  36 static inline char dash2underscore(char c)
  37 {
  38         if (c == '-')
  39                 return '_';
  40         return c;
  41 }
  42
  43 static inline int parameq(const char *input, const char *paramname)
  44 {
  45         unsigned int i;
  46         for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)
  47                 if (input[i] == '\0')
  48                         return 1;
  49         return 0;
  50 }
  51
  52 static int parse_one(char *param,
  53                      char *val,
  54                      struct kernel_param *params,
  55                      unsigned num_params,
  56                      int (*handle_unknown)(char *param, char *val))
  57 {
  58         unsigned int i;
  59
  60         /* Find parameter */
  61         for (i = 0; i < num_params; i++) {
  62                 if (parameq(param, params[i].name)) {
  63                         DEBUGP("They are equal!  Calling %p\n",
  64                                params[i].set);
  65                         return params[i].set(val, &params[i]);
  66                 }
  67         }
  68
  69         if (handle_unknown) {
  70                 DEBUGP("Unknown argument: calling %p\n", handle_unknown);
  71                 return handle_unknown(param, val);
  72         }
  73
  74         DEBUGP("Unknown argument `%s'\n", param);
  75         return -ENOENT;
  76 }
  77
  78 /* You can use " around spaces, but can't escape ". */
  79 /* Hyphens and underscores equivalent in parameter names. */
  80 static char *next_arg(char *args, char **param, char **val)
  81 {
  82         unsigned int i, equals = 0;
  83         int in_quote = 0, quoted = 0;
  84         char *next;
  85
  86         if (*args == '"') {
  87                 args++;
  88                 in_quote = 1;
  89                 quoted = 1;
  90         }
  91
  92         for (i = 0; args[i]; i++) {
  93                 if (args[i] == ' ' && !in_quote)
  94                         break;
  95                 if (equals == 0) {
  96                         if (args[i] == '=')
  97                                 equals = i;
  98                 }
  99                 if (args[i] == '"')
 100                         in_quote = !in_quote;
 101         }
 102
 103         *param = args;
 104         if (!equals)
 105                 *val = NULL;
 106         else {
 107                 args[equals] = '\0';
 108                 *val = args + equals + 1;
 109
 110                 /* Don't include quotes in value. */
 111                 if (**val == '"') {
 112                         (*val)++;
 113                         if (args[i-1] == '"')
 114                                 args[i-1] = '\0';
 115                 }
 116                 if (quoted && args[i-1] == '"')
 117                         args[i-1] = '\0';
 118         }
 119
 120         if (args[i]) {
 121                 args[i] = '\0';
 122                 next = args + i + 1;
 123         } else
 124                 next = args + i;
 125
 126         /* Chew up trailing spaces. */
 127         while (*next == ' ')
 128                 next++;
 129         return next;
 130 }
 131
 132 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
 133 int parse_args(const char *name,
 134                char *args,
 135                struct kernel_param *params,
 136                unsigned num,
 137                int (*unknown)(char *param, char *val))
 138 {
 139         char *param, *val;
 140
 141         DEBUGP("Parsing ARGS: %s\n", args);
 142
 143         /* Chew leading spaces */
 144         while (*args == ' ')
 145                 args++;
 146
 147         while (*args) {
 148                 int ret;
 149                 int irq_was_disabled;
 150
 151                 args = next_arg(args, &param, &val);
 152                 irq_was_disabled = irqs_disabled();
 153                 ret = parse_one(param, val, params, num, unknown);
 154                 if (irq_was_disabled && !irqs_disabled()) {
 155                         printk(KERN_WARNING "parse_args(): option '%s' enabled "
 156                                         "irq's!\n", param);
 157                 }
 158                 switch (ret) {
 159                 case -ENOENT:
 160                         printk(KERN_ERR "%s: Unknown parameter `%s'\n",
 161                                name, param);
 162                         return ret;
 163                 case -ENOSPC:
 164                         printk(KERN_ERR
 165                                "%s: `%s' too large for parameter `%s'\n",
 166                                name, val ?: "", param);
 167                         return ret;
 168                 case 0:
 169                         break;
 170                 default:
 171                         printk(KERN_ERR
 172                                "%s: `%s' invalid for parameter `%s'\n",
 173                                name, val ?: "", param);
 174                         return ret;
 175                 }
 176         }
 177
 178         /* All parsed OK. */
 179         return 0;
 180 }
 181
 182 /* Lazy bastard, eh? */
 183 #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn)       \
 184         int param_set_##name(const char *val, struct kernel_param *kp)  \
 185         {                                                               \
 186                 tmptype l;                                              \
 187                 int ret;                                                \
 188                                                                         \
 189                 if (!val) return -EINVAL;                               \
 190                 ret = strtolfn(val, 0, &l);                             \
 191                 if (ret == -EINVAL || ((type)l != l))                   \
 192                         return -EINVAL;                                 \
 193                 *((type *)kp->arg) = l;                                 \
 194                 return 0;                                               \
 195         }                                                               \
 196         int param_get_##name(char *buffer, struct kernel_param *kp)     \
 197         {                                                               \
 198                 return sprintf(buffer, format, *((type *)kp->arg));     \
 199         }
 200
 201 STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
 202 STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
 203 STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
 204 STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
 205 STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
 206 STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
 207 STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
 208
 209 int param_set_charp(const char *val, struct kernel_param *kp)
 210 {
 211         if (!val) {
 212                 printk(KERN_ERR "%s: string parameter expected\n",
 213                        kp->name);
 214                 return -EINVAL;
 215         }
 216
 217         if (strlen(val) > 1024) {
 218                 printk(KERN_ERR "%s: string parameter too long\n",
 219                        kp->name);
 220                 return -ENOSPC;
 221         }
 222
 223         if (kp->perm & KPARAM_KMALLOCED)
 224                 kfree(*(char **)kp->arg);
 225
 226         /* This is a hack.  We can't need to strdup in early boot, and we
 227          * don't need to; this mangled commandline is preserved. */
 228         if (slab_is_available()) {
 229                 kp->perm |= KPARAM_KMALLOCED;
 230                 *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
 231                 if (!kp->arg)
 232                         return -ENOMEM;
 233         } else
 234                 *(const char **)kp->arg = val;
 235
 236         return 0;
 237 }
 238
 239 int param_get_charp(char *buffer, struct kernel_param *kp)
 240 {
 241         return sprintf(buffer, "%s", *((char **)kp->arg));
 242 }
 243
 244 int param_set_bool(const char *val, struct kernel_param *kp)
 245 {
 246         /* No equals means "set"... */
 247         if (!val) val = "1";
 248
 249         /* One of =[yYnN01] */
 250         switch (val[0]) {
 251         case 'y': case 'Y': case '1':
 252                 *(int *)kp->arg = 1;
 253                 return 0;
 254         case 'n': case 'N': case '0':
 255                 *(int *)kp->arg = 0;
 256                 return 0;
 257         }
 258         return -EINVAL;
 259 }
 260
 261 int param_get_bool(char *buffer, struct kernel_param *kp)
 262 {
 263         /* Y and N chosen as being relatively non-coder friendly */
 264         return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N');
 265 }
 266
 267 int param_set_invbool(const char *val, struct kernel_param *kp)
 268 {
 269         int boolval, ret;
 270         struct kernel_param dummy;
 271
 272         dummy.arg = &boolval;
 273         ret = param_set_bool(val, &dummy);
 274         if (ret == 0)
 275                 *(int *)kp->arg = !boolval;
 276         return ret;
 277 }
 278
 279 int param_get_invbool(char *buffer, struct kernel_param *kp)
 280 {
 281         return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'N' : 'Y');
 282 }
 283
 284 /* We break the rule and mangle the string. */
 285 static int param_array(const char *name,
 286                        const char *val,
 287                        unsigned int min, unsigned int max,
 288                        void *elem, int elemsize,
 289                        int (*set)(const char *, struct kernel_param *kp),
 290                        unsigned int *num)
 291 {
 292         int ret;
 293         struct kernel_param kp;
 294         char save;
 295
 296         /* Get the name right for errors. */
 297         kp.name = name;
 298         kp.arg = elem;
 299
 300         /* No equals sign? */
 301         if (!val) {
 302                 printk(KERN_ERR "%s: expects arguments\n", name);
 303                 return -EINVAL;
 304         }
 305
 306         *num = 0;
 307         /* We expect a comma-separated list of values. */
 308         do {
 309                 int len;
 310
 311                 if (*num == max) {
 312                         printk(KERN_ERR "%s: can only take %i arguments\n",
 313                                name, max);
 314                         return -EINVAL;
 315                 }
 316                 len = strcspn(val, ",");
 317
 318                 /* nul-terminate and parse */
 319                 save = val[len];
 320                 ((char *)val)[len] = '\0';
 321                 ret = set(val, &kp);
 322
 323                 if (ret != 0)
 324                         return ret;
 325                 kp.arg += elemsize;
 326                 val += len+1;
 327                 (*num)++;
 328         } while (save == ',');
 329
 330         if (*num < min) {
 331                 printk(KERN_ERR "%s: needs at least %i arguments\n",
 332                        name, min);
 333                 return -EINVAL;
 334         }
 335         return 0;
 336 }
 337
 338 int param_array_set(const char *val, struct kernel_param *kp)
 339 {
 340         const struct kparam_array *arr = kp->arr;
 341         unsigned int temp_num;
 342
 343         return param_array(kp->name, val, 1, arr->max, arr->elem,
 344                            arr->elemsize, arr->set, arr->num ?: &temp_num);
 345 }
 346
 347 int param_array_get(char *buffer, struct kernel_param *kp)
 348 {
 349         int i, off, ret;
 350         const struct kparam_array *arr = kp->arr;
 351         struct kernel_param p;
 352
 353         p = *kp;
 354         for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
 355                 if (i)
 356                         buffer[off++] = ',';
 357                 p.arg = arr->elem + arr->elemsize * i;
 358                 ret = arr->get(buffer + off, &p);
 359                 if (ret < 0)
 360                         return ret;
 361                 off += ret;
 362         }
 363         buffer[off] = '\0';
 364         return off;
 365 }
 366
 367 int param_set_copystring(const char *val, struct kernel_param *kp)
 368 {
 369         const struct kparam_string *kps = kp->str;
 370
 371         if (!val) {
 372                 printk(KERN_ERR "%s: missing param set value\n", kp->name);
 373                 return -EINVAL;
 374         }
 375         if (strlen(val)+1 > kps->maxlen) {
 376                 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
 377                        kp->name, kps->maxlen-1);
 378                 return -ENOSPC;
 379         }
 380         strcpy(kps->string, val);
 381         return 0;
 382 }
 383
 384 int param_get_string(char *buffer, struct kernel_param *kp)
 385 {
 386         const struct kparam_string *kps = kp->str;
 387         return strlcpy(buffer, kps->string, kps->maxlen);
 388 }
 389
 390 /* sysfs output in /sys/modules/XYZ/parameters/ */
 391 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
 392 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
 393
 394 extern struct kernel_param __start___param[], __stop___param[];
 395
 396 struct param_attribute
 397 {
 398         struct module_attribute mattr;
 399         struct kernel_param *param;
 400 };
 401
 402 struct module_param_attrs
 403 {
 404         unsigned int num;
 405         struct attribute_group grp;
 406         struct param_attribute attrs[0];
 407 };
 408
 409 #ifdef CONFIG_SYSFS
 410 #define to_param_attr(n) container_of(n, struct param_attribute, mattr);
 411
 412 static ssize_t param_attr_show(struct module_attribute *mattr,
 413                                struct module *mod, char *buf)
 414 {
 415         int count;
 416         struct param_attribute *attribute = to_param_attr(mattr);
 417
 418         if (!attribute->param->get)
 419                 return -EPERM;
 420
 421         count = attribute->param->get(buf, attribute->param);
 422         if (count > 0) {
 423                 strcat(buf, "\n");
 424                 ++count;
 425         }
 426         return count;
 427 }
 428
 429 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
 430 static ssize_t param_attr_store(struct module_attribute *mattr,
 431                                 struct module *owner,
 432                                 const char *buf, size_t len)
 433 {
 434         int err;
 435         struct param_attribute *attribute = to_param_attr(mattr);
 436
 437         if (!attribute->param->set)
 438                 return -EPERM;
 439
 440         err = attribute->param->set(buf, attribute->param);
 441         if (!err)
 442                 return len;
 443         return err;
 444 }
 445 #endif
 446
 447 #ifdef CONFIG_MODULES
 448 #define __modinit
 449 #else
 450 #define __modinit __init
 451 #endif
 452
 453 #ifdef CONFIG_SYSFS
 454 /*
 455  * add_sysfs_param - add a parameter to sysfs
 456  * @mk: struct module_kobject
 457  * @kparam: the actual parameter definition to add to sysfs
 458  * @name: name of parameter
 459  *
 460  * Create a kobject if for a (per-module) parameter if mp NULL, and
 461  * create file in sysfs.  Returns an error on out of memory.  Always cleans up
 462  * if there's an error.
 463  */
 464 static __modinit int add_sysfs_param(struct module_kobject *mk,
 465                                      struct kernel_param *kp,
 466                                      const char *name)
 467 {
 468         struct module_param_attrs *new;
 469         struct attribute **attrs;
 470         int err, num;
 471
 472         /* We don't bother calling this with invisible parameters. */
 473         BUG_ON(!kp->perm);
 474
 475         if (!mk->mp) {
 476                 num = 0;
 477                 attrs = NULL;
 478         } else {
 479                 num = mk->mp->num;
 480                 attrs = mk->mp->grp.attrs;
 481         }
 482
 483         /* Enlarge. */
 484         new = krealloc(mk->mp,
 485                        sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
 486                        GFP_KERNEL);
 487         if (!new) {
 488                 kfree(mk->mp);
 489                 err = -ENOMEM;
 490                 goto fail;
 491         }
 492         attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
 493         if (!attrs) {
 494                 err = -ENOMEM;
 495                 goto fail_free_new;
 496         }
 497
 498         /* Sysfs wants everything zeroed. */
 499         memset(new, 0, sizeof(*new));
 500         memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
 501         memset(&attrs[num], 0, sizeof(attrs[num]));
 502         new->grp.name = "parameters";
 503         new->grp.attrs = attrs;
 504
 505         /* Tack new one on the end. */
 506         new->attrs[num].param = kp;
 507         new->attrs[num].mattr.show = param_attr_show;
 508         new->attrs[num].mattr.store = param_attr_store;
 509         new->attrs[num].mattr.attr.name = (char *)name;
 510         new->attrs[num].mattr.attr.mode = kp->perm;
 511         new->num = num+1;
 512
 513         /* Fix up all the pointers, since krealloc can move us */
 514         for (num = 0; num < new->num; num++)
 515                 new->grp.attrs[num] = &new->attrs[num].mattr.attr;
 516         new->grp.attrs[num] = NULL;
 517
 518         mk->mp = new;
 519         return 0;
 520
 521 fail_free_new:
 522         kfree(new);
 523 fail:
 524         mk->mp = NULL;
 525         return err;
 526 }
 527
 528 #ifdef CONFIG_MODULES
 529 static void free_module_param_attrs(struct module_kobject *mk)
 530 {
 531         kfree(mk->mp->grp.attrs);
 532         kfree(mk->mp);
 533         mk->mp = NULL;
 534 }
 535
 536 /*
 537  * module_param_sysfs_setup - setup sysfs support for one module
 538  * @mod: module
 539  * @kparam: module parameters (array)
 540  * @num_params: number of module parameters
 541  *
 542  * Adds sysfs entries for module parameters under
 543  * /sys/module/[mod->name]/parameters/
 544  */
 545 int module_param_sysfs_setup(struct module *mod,
 546                              struct kernel_param *kparam,
 547                              unsigned int num_params)
 548 {
 549         int i, err;
 550         bool params = false;
 551
 552         for (i = 0; i < num_params; i++) {
 553                 if (kparam[i].perm == 0)
 554                         continue;
 555                 err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
 556                 if (err)
 557                         return err;
 558                 params = true;
 559         }
 560
 561         if (!params)
 562                 return 0;
 563
 564         /* Create the param group. */
 565         err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
 566         if (err)
 567                 free_module_param_attrs(&mod->mkobj);
 568         return err;
 569 }
 570
 571 /*
 572  * module_param_sysfs_remove - remove sysfs support for one module
 573  * @mod: module
 574  *
 575  * Remove sysfs entries for module parameters and the corresponding
 576  * kobject.
 577  */
 578 void module_param_sysfs_remove(struct module *mod)
 579 {
 580         if (mod->mkobj.mp) {
 581                 sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
 582                 /* We are positive that no one is using any param
 583                  * attrs at this point.  Deallocate immediately. */
 584                 free_module_param_attrs(&mod->mkobj);
 585         }
 586 }
 587 #endif
 588
 589 void destroy_params(const struct kernel_param *params, unsigned num)
 590 {
 591         unsigned int i;
 592
 593         for (i = 0; i < num; i++)
 594                 if (params[i].perm & KPARAM_KMALLOCED)
 595                         kfree(*(char **)params[i].arg);
 596 }
 597
 598 static void __init kernel_add_sysfs_param(const char *name,
 599                                           struct kernel_param *kparam,
 600                                           unsigned int name_skip)
 601 {
 602         struct module_kobject *mk;
 603         struct kobject *kobj;
 604         int err;
 605
 606         kobj = kset_find_obj(module_kset, name);
 607         if (kobj) {
 608                 /* We already have one.  Remove params so we can add more. */
 609                 mk = to_module_kobject(kobj);
 610                 /* We need to remove it before adding parameters. */
 611                 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
 612         } else {
 613                 mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
 614                 BUG_ON(!mk);
 615
 616                 mk->mod = THIS_MODULE;
 617                 mk->kobj.kset = module_kset;
 618                 err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
 619                                            "%s", name);
 620                 if (err) {
 621                         kobject_put(&mk->kobj);
 622                         printk(KERN_ERR "Module '%s' failed add to sysfs, "
 623                                "error number %d\n", name, err);
 624                         printk(KERN_ERR "The system will be unstable now.\n");
 625                         return;
 626                 }
 627                 /* So that exit path is even. */
 628                 kobject_get(&mk->kobj);
 629         }
 630
 631         /* These should not fail at boot. */
 632         err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
 633         BUG_ON(err);
 634         err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
 635         BUG_ON(err);
 636         kobject_uevent(&mk->kobj, KOBJ_ADD);
 637         kobject_put(&mk->kobj);
 638 }
 639
 640 /*
 641  * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
 642  *
 643  * Add module_parameters to sysfs for "modules" built into the kernel.
 644  *
 645  * The "module" name (KBUILD_MODNAME) is stored before a dot, the
 646  * "parameter" name is stored behind a dot in kernel_param->name. So,
 647  * extract the "module" name for all built-in kernel_param-eters,
 648  * and for all who have the same, call kernel_add_sysfs_param.
 649  */
 650 static void __init param_sysfs_builtin(void)
 651 {
 652         struct kernel_param *kp;
 653         unsigned int name_len;
 654         char modname[MODULE_NAME_LEN];
 655
 656         for (kp = __start___param; kp < __stop___param; kp++) {
 657                 char *dot;
 658
 659                 if (kp->perm == 0)
 660                         continue;
 661
 662                 dot = strchr(kp->name, '.');
 663                 if (!dot) {
 664                         /* This happens for core_param() */
 665                         strcpy(modname, "kernel");
 666                         name_len = 0;
 667                 } else {
 668                         name_len = dot - kp->name + 1;
 669                         strlcpy(modname, kp->name, name_len);
 670                 }
 671                 kernel_add_sysfs_param(modname, kp, name_len);
 672         }
 673 }
 674
 675
 676 /* module-related sysfs stuff */
 677
 678 static ssize_t module_attr_show(struct kobject *kobj,
 679                                 struct attribute *attr,
 680                                 char *buf)
 681 {
 682         struct module_attribute *attribute;
 683         struct module_kobject *mk;
 684         int ret;
 685
 686         attribute = to_module_attr(attr);
 687         mk = to_module_kobject(kobj);
 688
 689         if (!attribute->show)
 690                 return -EIO;
 691
 692         ret = attribute->show(attribute, mk->mod, buf);
 693
 694         return ret;
 695 }
 696
 697 static ssize_t module_attr_store(struct kobject *kobj,
 698                                 struct attribute *attr,
 699                                 const char *buf, size_t len)
 700 {
 701         struct module_attribute *attribute;
 702         struct module_kobject *mk;
 703         int ret;
 704
 705         attribute = to_module_attr(attr);
 706         mk = to_module_kobject(kobj);
 707
 708         if (!attribute->store)
 709                 return -EIO;
 710
 711         ret = attribute->store(attribute, mk->mod, buf, len);
 712
 713         return ret;
 714 }
 715
 716 static struct sysfs_ops module_sysfs_ops = {
 717         .show = module_attr_show,
 718         .store = module_attr_store,
 719 };
 720
 721 static int uevent_filter(struct kset *kset, struct kobject *kobj)
 722 {
 723         struct kobj_type *ktype = get_ktype(kobj);
 724
 725         if (ktype == &module_ktype)
 726                 return 1;
 727         return 0;
 728 }
 729
 730 static struct kset_uevent_ops module_uevent_ops = {
 731         .filter = uevent_filter,
 732 };
 733
 734 struct kset *module_kset;
 735 int module_sysfs_initialized;
 736
 737 struct kobj_type module_ktype = {
 738         .sysfs_ops =    &module_sysfs_ops,
 739 };
 740
 741 /*
 742  * param_sysfs_init - wrapper for built-in params support
 743  */
 744 static int __init param_sysfs_init(void)
 745 {
 746         module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
 747         if (!module_kset) {
 748                 printk(KERN_WARNING "%s (%d): error creating kset\n",
 749                         __FILE__, __LINE__);
 750                 return -ENOMEM;
 751         }
 752         module_sysfs_initialized = 1;
 753
 754         param_sysfs_builtin();
 755
 756         return 0;
 757 }
 758 subsys_initcall(param_sysfs_init);
 759
 760 #endif /* CONFIG_SYSFS */
 761
 762 EXPORT_SYMBOL(param_set_byte);
 763 EXPORT_SYMBOL(param_get_byte);
 764 EXPORT_SYMBOL(param_set_short);
 765 EXPORT_SYMBOL(param_get_short);
 766 EXPORT_SYMBOL(param_set_ushort);
 767 EXPORT_SYMBOL(param_get_ushort);
 768 EXPORT_SYMBOL(param_set_int);
 769 EXPORT_SYMBOL(param_get_int);
 770 EXPORT_SYMBOL(param_set_uint);
 771 EXPORT_SYMBOL(param_get_uint);
 772 EXPORT_SYMBOL(param_set_long);
 773 EXPORT_SYMBOL(param_get_long);
 774 EXPORT_SYMBOL(param_set_ulong);
 775 EXPORT_SYMBOL(param_get_ulong);
 776 EXPORT_SYMBOL(param_set_charp);
 777 EXPORT_SYMBOL(param_get_charp);
 778 EXPORT_SYMBOL(param_set_bool);
 779 EXPORT_SYMBOL(param_get_bool);
 780 EXPORT_SYMBOL(param_set_invbool);
 781 EXPORT_SYMBOL(param_get_invbool);
 782 EXPORT_SYMBOL(param_array_set);
 783 EXPORT_SYMBOL(param_array_get);
 784 EXPORT_SYMBOL(param_set_copystring);
 785 EXPORT_SYMBOL(param_get_string);