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