kernel/params.c

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