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         return skip_spaces(next);
 126 }
 127
 128 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
 129 int parse_args(const char *name,
 130                char *args,
 131                struct kernel_param *params,
 132                unsigned num,
 133                int (*unknown)(char *param, char *val))
 134 {
 135         char *param, *val;
 136
 137         DEBUGP("Parsing ARGS: %s\n", args);
 138
 139         /* Chew leading spaces */
 140         args = skip_spaces(args);
 141
 142         while (*args) {
 143                 int ret;
 144                 int irq_was_disabled;
 145
 146                 args = next_arg(args, &param, &val);
 147                 irq_was_disabled = irqs_disabled();
 148                 ret = parse_one(param, val, params, num, unknown);
 149                 if (irq_was_disabled && !irqs_disabled()) {
 150                         printk(KERN_WARNING "parse_args(): option '%s' enabled "
 151                                         "irq's!\n", param);
 152                 }
 153                 switch (ret) {
 154                 case -ENOENT:
 155                         printk(KERN_ERR "%s: Unknown parameter `%s'\n",
 156                                name, param);
 157                         return ret;
 158                 case -ENOSPC:
 159                         printk(KERN_ERR
 160                                "%s: `%s' too large for parameter `%s'\n",
 161                                name, val ?: "", param);
 162                         return ret;
 163                 case 0:
 164                         break;
 165                 default:
 166                         printk(KERN_ERR
 167                                "%s: `%s' invalid for parameter `%s'\n",
 168                                name, val ?: "", param);
 169                         return ret;
 170                 }
 171         }
 172
 173         /* All parsed OK. */
 174         return 0;
 175 }
 176
 177 /* Lazy bastard, eh? */
 178 #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn)       \
 179         int param_set_##name(const char *val, struct kernel_param *kp)  \
 180         {                                                               \
 181                 tmptype l;                                              \
 182                 int ret;                                                \
 183                                                                         \
 184                 if (!val) return -EINVAL;                               \
 185                 ret = strtolfn(val, 0, &l);                             \
 186                 if (ret == -EINVAL || ((type)l != l))                   \
 187                         return -EINVAL;                                 \
 188                 *((type *)kp->arg) = l;                                 \
 189                 return 0;                                               \
 190         }                                                               \
 191         int param_get_##name(char *buffer, struct kernel_param *kp)     \
 192         {                                                               \
 193                 return sprintf(buffer, format, *((type *)kp->arg));     \
 194         }
 195
 196 STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
 197 STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
 198 STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
 199 STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
 200 STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
 201 STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
 202 STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
 203
 204 int param_set_charp(const char *val, struct kernel_param *kp)
 205 {
 206         if (!val) {
 207                 printk(KERN_ERR "%s: string parameter expected\n",
 208                        kp->name);
 209                 return -EINVAL;
 210         }
 211
 212         if (strlen(val) > 1024) {
 213                 printk(KERN_ERR "%s: string parameter too long\n",
 214                        kp->name);
 215                 return -ENOSPC;
 216         }
 217
 218         /* This is a hack.  We can't need to strdup in early boot, and we
 219          * don't need to; this mangled commandline is preserved. */
 220         if (slab_is_available()) {
 221                 *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
 222                 if (!*(char **)kp->arg)
 223                         return -ENOMEM;
 224         } else
 225                 *(const char **)kp->arg = val;
 226
 227         return 0;
 228 }
 229
 230 int param_get_charp(char *buffer, struct kernel_param *kp)
 231 {
 232         return sprintf(buffer, "%s", *((char **)kp->arg));
 233 }
 234
 235 /* Actually could be a bool or an int, for historical reasons. */
 236 int param_set_bool(const char *val, struct kernel_param *kp)
 237 {
 238         bool v;
 239
 240         /* No equals means "set"... */
 241         if (!val) val = "1";
 242
 243         /* One of =[yYnN01] */
 244         switch (val[0]) {
 245         case 'y': case 'Y': case '1':
 246                 v = true;
 247                 break;
 248         case 'n': case 'N': case '0':
 249                 v = false;
 250                 break;
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         if (kp->flags & KPARAM_ISBOOL)
 256                 *(bool *)kp->arg = v;
 257         else
 258                 *(int *)kp->arg = v;
 259         return 0;
 260 }
 261
 262 int param_get_bool(char *buffer, struct kernel_param *kp)
 263 {
 264         bool val;
 265         if (kp->flags & KPARAM_ISBOOL)
 266                 val = *(bool *)kp->arg;
 267         else
 268                 val = *(int *)kp->arg;
 269
 270         /* Y and N chosen as being relatively non-coder friendly */
 271         return sprintf(buffer, "%c", val ? 'Y' : 'N');
 272 }
 273
 274 /* This one must be bool. */
 275 int param_set_invbool(const char *val, struct kernel_param *kp)
 276 {
 277         int ret;
 278         bool boolval;
 279         struct kernel_param dummy;
 280
 281         dummy.arg = &boolval;
 282         dummy.flags = KPARAM_ISBOOL;
 283         ret = param_set_bool(val, &dummy);
 284         if (ret == 0)
 285                 *(bool *)kp->arg = !boolval;
 286         return ret;
 287 }
 288
 289 int param_get_invbool(char *buffer, struct kernel_param *kp)
 290 {
 291         return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
 292 }
 293
 294 /* We break the rule and mangle the string. */
 295 static int param_array(const char *name,
 296                        const char *val,
 297                        unsigned int min, unsigned int max,
 298                        void *elem, int elemsize,
 299                        int (*set)(const char *, struct kernel_param *kp),
 300                        u16 flags,
 301                        unsigned int *num)
 302 {
 303         int ret;
 304         struct kernel_param kp;
 305         char save;
 306
 307         /* Get the name right for errors. */
 308         kp.name = name;
 309         kp.arg = elem;
 310         kp.flags = flags;
 311
 312         /* No equals sign? */
 313         if (!val) {
 314                 printk(KERN_ERR "%s: expects arguments\n", name);
 315                 return -EINVAL;
 316         }
 317
 318         *num = 0;
 319         /* We expect a comma-separated list of values. */
 320         do {
 321                 int len;
 322
 323                 if (*num == max) {
 324                         printk(KERN_ERR "%s: can only take %i arguments\n",
 325                                name, max);
 326                         return -EINVAL;
 327                 }
 328                 len = strcspn(val, ",");
 329
 330                 /* nul-terminate and parse */
 331                 save = val[len];
 332                 ((char *)val)[len] = '\0';
 333                 ret = set(val, &kp);
 334
 335                 if (ret != 0)
 336                         return ret;
 337                 kp.arg += elemsize;
 338                 val += len+1;
 339                 (*num)++;
 340         } while (save == ',');
 341
 342         if (*num < min) {
 343                 printk(KERN_ERR "%s: needs at least %i arguments\n",
 344                        name, min);
 345                 return -EINVAL;
 346         }
 347         return 0;
 348 }
 349
 350 int param_array_set(const char *val, struct kernel_param *kp)
 351 {
 352         const struct kparam_array *arr = kp->arr;
 353         unsigned int temp_num;
 354
 355         return param_array(kp->name, val, 1, arr->max, arr->elem,
 356                            arr->elemsize, arr->set, kp->flags,
 357                            arr->num ?: &temp_num);
 358 }
 359
 360 int param_array_get(char *buffer, struct kernel_param *kp)
 361 {
 362         int i, off, ret;
 363         const struct kparam_array *arr = kp->arr;
 364         struct kernel_param p;
 365
 366         p = *kp;
 367         for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
 368                 if (i)
 369                         buffer[off++] = ',';
 370                 p.arg = arr->elem + arr->elemsize * i;
 371                 ret = arr->get(buffer + off, &p);
 372                 if (ret < 0)
 373                         return ret;
 374                 off += ret;
 375         }
 376         buffer[off] = '\0';
 377         return off;
 378 }
 379
 380 int param_set_copystring(const char *val, struct kernel_param *kp)
 381 {
 382         const struct kparam_string *kps = kp->str;
 383
 384         if (!val) {
 385                 printk(KERN_ERR "%s: missing param set value\n", kp->name);
 386                 return -EINVAL;
 387         }
 388         if (strlen(val)+1 > kps->maxlen) {
 389                 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
 390                        kp->name, kps->maxlen-1);
 391                 return -ENOSPC;
 392         }
 393         strcpy(kps->string, val);
 394         return 0;
 395 }
 396
 397 int param_get_string(char *buffer, struct kernel_param *kp)
 398 {
 399         const struct kparam_string *kps = kp->str;
 400         return strlcpy(buffer, kps->string, kps->maxlen);
 401 }
 402
 403 /* sysfs output in /sys/modules/XYZ/parameters/ */
 404 #define to_module_attr(n) container_of(n, struct module_attribute, attr)
 405 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
 406
 407 extern struct kernel_param __start___param[], __stop___param[];
 408
 409 struct param_attribute
 410 {
 411         struct module_attribute mattr;
 412         struct kernel_param *param;
 413 };
 414
 415 struct module_param_attrs
 416 {
 417         unsigned int num;
 418         struct attribute_group grp;
 419         struct param_attribute attrs[0];
 420 };
 421
 422 #ifdef CONFIG_SYSFS
 423 #define to_param_attr(n) container_of(n, struct param_attribute, mattr)
 424
 425 static ssize_t param_attr_show(struct module_attribute *mattr,
 426                                struct module *mod, char *buf)
 427 {
 428         int count;
 429         struct param_attribute *attribute = to_param_attr(mattr);
 430
 431         if (!attribute->param->get)
 432                 return -EPERM;
 433
 434         count = attribute->param->get(buf, attribute->param);
 435         if (count > 0) {
 436                 strcat(buf, "\n");
 437                 ++count;
 438         }
 439         return count;
 440 }
 441
 442 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
 443 static ssize_t param_attr_store(struct module_attribute *mattr,
 444                                 struct module *owner,
 445                                 const char *buf, size_t len)
 446 {
 447         int err;
 448         struct param_attribute *attribute = to_param_attr(mattr);
 449
 450         if (!attribute->param->set)
 451                 return -EPERM;
 452
 453         err = attribute->param->set(buf, attribute->param);
 454         if (!err)
 455                 return len;
 456         return err;
 457 }
 458 #endif
 459
 460 #ifdef CONFIG_MODULES
 461 #define __modinit
 462 #else
 463 #define __modinit __init
 464 #endif
 465
 466 #ifdef CONFIG_SYSFS
 467 /*
 468  * add_sysfs_param - add a parameter to sysfs
 469  * @mk: struct module_kobject
 470  * @kparam: the actual parameter definition to add to sysfs
 471  * @name: name of parameter
 472  *
 473  * Create a kobject if for a (per-module) parameter if mp NULL, and
 474  * create file in sysfs.  Returns an error on out of memory.  Always cleans up
 475  * if there's an error.
 476  */
 477 static __modinit int add_sysfs_param(struct module_kobject *mk,
 478                                      struct kernel_param *kp,
 479                                      const char *name)
 480 {
 481         struct module_param_attrs *new;
 482         struct attribute **attrs;
 483         int err, num;
 484
 485         /* We don't bother calling this with invisible parameters. */
 486         BUG_ON(!kp->perm);
 487
 488         if (!mk->mp) {
 489                 num = 0;
 490                 attrs = NULL;
 491         } else {
 492                 num = mk->mp->num;
 493                 attrs = mk->mp->grp.attrs;
 494         }
 495
 496         /* Enlarge. */
 497         new = krealloc(mk->mp,
 498                        sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
 499                        GFP_KERNEL);
 500         if (!new) {
 501                 kfree(mk->mp);
 502                 err = -ENOMEM;
 503                 goto fail;
 504         }
 505         attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
 506         if (!attrs) {
 507                 err = -ENOMEM;
 508                 goto fail_free_new;
 509         }
 510
 511         /* Sysfs wants everything zeroed. */
 512         memset(new, 0, sizeof(*new));
 513         memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
 514         memset(&attrs[num], 0, sizeof(attrs[num]));
 515         new->grp.name = "parameters";
 516         new->grp.attrs = attrs;
 517
 518         /* Tack new one on the end. */
 519         sysfs_attr_init(&new->attrs[num].mattr.attr);
 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 const 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 const 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);