kernel/params.c

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