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                 char *endp;                                             \
 184                 tmptype l;                                              \
 185                                                                         \
 186                 if (!val) return -EINVAL;                               \
 187                 l = strtolfn(val, &endp, 0);                            \
 188                 if (endp == val || ((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, simple_strtoul);
 199 STANDARD_PARAM_DEF(short, short, "%hi", long, simple_strtol);
 200 STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, simple_strtoul);
 201 STANDARD_PARAM_DEF(int, int, "%i", long, simple_strtol);
 202 STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, simple_strtoul);
 203 STANDARD_PARAM_DEF(long, long, "%li", long, simple_strtol);
 204 STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, simple_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         *(char **)kp->arg = (char *)val;
 221         return 0;
 222 }
 223
 224 int param_get_charp(char *buffer, struct kernel_param *kp)
 225 {
 226         return sprintf(buffer, "%s", *((char **)kp->arg));
 227 }
 228
 229 int param_set_bool(const char *val, struct kernel_param *kp)
 230 {
 231         /* No equals means "set"... */
 232         if (!val) val = "1";
 233
 234         /* One of =[yYnN01] */
 235         switch (val[0]) {
 236         case 'y': case 'Y': case '1':
 237                 *(int *)kp->arg = 1;
 238                 return 0;
 239         case 'n': case 'N': case '0':
 240                 *(int *)kp->arg = 0;
 241                 return 0;
 242         }
 243         return -EINVAL;
 244 }
 245
 246 int param_get_bool(char *buffer, struct kernel_param *kp)
 247 {
 248         /* Y and N chosen as being relatively non-coder friendly */
 249         return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N');
 250 }
 251
 252 int param_set_invbool(const char *val, struct kernel_param *kp)
 253 {
 254         int boolval, ret;
 255         struct kernel_param dummy = { .arg = &boolval };
 256
 257         ret = param_set_bool(val, &dummy);
 258         if (ret == 0)
 259                 *(int *)kp->arg = !boolval;
 260         return ret;
 261 }
 262
 263 int param_get_invbool(char *buffer, struct kernel_param *kp)
 264 {
 265         int val;
 266         struct kernel_param dummy = { .arg = &val };
 267
 268         val = !*(int *)kp->arg;
 269         return param_get_bool(buffer, &dummy);
 270 }
 271
 272 /* We cheat here and temporarily mangle the string. */
 273 static int param_array(const char *name,
 274                        const char *val,
 275                        unsigned int min, unsigned int max,
 276                        void *elem, int elemsize,
 277                        int (*set)(const char *, struct kernel_param *kp),
 278                        int *num)
 279 {
 280         int ret;
 281         struct kernel_param kp;
 282         char save;
 283
 284         /* Get the name right for errors. */
 285         kp.name = name;
 286         kp.arg = elem;
 287
 288         /* No equals sign? */
 289         if (!val) {
 290                 printk(KERN_ERR "%s: expects arguments\n", name);
 291                 return -EINVAL;
 292         }
 293
 294         *num = 0;
 295         /* We expect a comma-separated list of values. */
 296         do {
 297                 int len;
 298
 299                 if (*num == max) {
 300                         printk(KERN_ERR "%s: can only take %i arguments\n",
 301                                name, max);
 302                         return -EINVAL;
 303                 }
 304                 len = strcspn(val, ",");
 305
 306                 /* nul-terminate and parse */
 307                 save = val[len];
 308                 ((char *)val)[len] = '\0';
 309                 ret = set(val, &kp);
 310
 311                 if (ret != 0)
 312                         return ret;
 313                 kp.arg += elemsize;
 314                 val += len+1;
 315                 (*num)++;
 316         } while (save == ',');
 317
 318         if (*num < min) {
 319                 printk(KERN_ERR "%s: needs at least %i arguments\n",
 320                        name, min);
 321                 return -EINVAL;
 322         }
 323         return 0;
 324 }
 325
 326 int param_array_set(const char *val, struct kernel_param *kp)
 327 {
 328         struct kparam_array *arr = kp->arg;
 329         unsigned int temp_num;
 330
 331         return param_array(kp->name, val, 1, arr->max, arr->elem,
 332                            arr->elemsize, arr->set, arr->num ?: &temp_num);
 333 }
 334
 335 int param_array_get(char *buffer, struct kernel_param *kp)
 336 {
 337         int i, off, ret;
 338         struct kparam_array *arr = kp->arg;
 339         struct kernel_param p;
 340
 341         p = *kp;
 342         for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
 343                 if (i)
 344                         buffer[off++] = ',';
 345                 p.arg = arr->elem + arr->elemsize * i;
 346                 ret = arr->get(buffer + off, &p);
 347                 if (ret < 0)
 348                         return ret;
 349                 off += ret;
 350         }
 351         buffer[off] = '\0';
 352         return off;
 353 }
 354
 355 int param_set_copystring(const char *val, struct kernel_param *kp)
 356 {
 357         struct kparam_string *kps = kp->arg;
 358
 359         if (strlen(val)+1 > kps->maxlen) {
 360                 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
 361                        kp->name, kps->maxlen-1);
 362                 return -ENOSPC;
 363         }
 364         strcpy(kps->string, val);
 365         return 0;
 366 }
 367
 368 int param_get_string(char *buffer, struct kernel_param *kp)
 369 {
 370         struct kparam_string *kps = kp->arg;
 371         return strlcpy(buffer, kps->string, kps->maxlen);
 372 }
 373
 374 /* sysfs output in /sys/modules/XYZ/parameters/ */
 375
 376 extern struct kernel_param __start___param[], __stop___param[];
 377
 378 #define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
 379
 380 struct param_attribute
 381 {
 382         struct module_attribute mattr;
 383         struct kernel_param *param;
 384 };
 385
 386 struct module_param_attrs
 387 {
 388         struct attribute_group grp;
 389         struct param_attribute attrs[0];
 390 };
 391
 392 #define to_param_attr(n) container_of(n, struct param_attribute, mattr);
 393
 394 static ssize_t param_attr_show(struct module_attribute *mattr,
 395                                struct module *mod, char *buf)
 396 {
 397         int count;
 398         struct param_attribute *attribute = to_param_attr(mattr);
 399
 400         if (!attribute->param->get)
 401                 return -EPERM;
 402
 403         count = attribute->param->get(buf, attribute->param);
 404         if (count > 0) {
 405                 strcat(buf, "\n");
 406                 ++count;
 407         }
 408         return count;
 409 }
 410
 411 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
 412 static ssize_t param_attr_store(struct module_attribute *mattr,
 413                                 struct module *owner,
 414                                 const char *buf, size_t len)
 415 {
 416         int err;
 417         struct param_attribute *attribute = to_param_attr(mattr);
 418
 419         if (!attribute->param->set)
 420                 return -EPERM;
 421
 422         err = attribute->param->set(buf, attribute->param);
 423         if (!err)
 424                 return len;
 425         return err;
 426 }
 427
 428 #ifdef CONFIG_MODULES
 429 #define __modinit
 430 #else
 431 #define __modinit __init
 432 #endif
 433
 434 /*
 435  * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
 436  * @mk: struct module_kobject (contains parent kobject)
 437  * @kparam: array of struct kernel_param, the actual parameter definitions
 438  * @num_params: number of entries in array
 439  * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
 440  *
 441  * Create a kobject for a (per-module) group of parameters, and create files
 442  * in sysfs. A pointer to the param_kobject is returned on success,
 443  * NULL if there's no parameter to export, or other ERR_PTR(err).
 444  */
 445 static __modinit struct module_param_attrs *
 446 param_sysfs_setup(struct module_kobject *mk,
 447                   struct kernel_param *kparam,
 448                   unsigned int num_params,
 449                   unsigned int name_skip)
 450 {
 451         struct module_param_attrs *mp;
 452         unsigned int valid_attrs = 0;
 453         unsigned int i, size[2];
 454         struct param_attribute *pattr;
 455         struct attribute **gattr;
 456         int err;
 457
 458         for (i=0; i<num_params; i++) {
 459                 if (kparam[i].perm)
 460                         valid_attrs++;
 461         }
 462
 463         if (!valid_attrs)
 464                 return NULL;
 465
 466         size[0] = ALIGN(sizeof(*mp) +
 467                         valid_attrs * sizeof(mp->attrs[0]),
 468                         sizeof(mp->grp.attrs[0]));
 469         size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
 470
 471         mp = kmalloc(size[0] + size[1], GFP_KERNEL);
 472         if (!mp)
 473                 return ERR_PTR(-ENOMEM);
 474
 475         mp->grp.name = "parameters";
 476         mp->grp.attrs = (void *)mp + size[0];
 477
 478         pattr = &mp->attrs[0];
 479         gattr = &mp->grp.attrs[0];
 480         for (i = 0; i < num_params; i++) {
 481                 struct kernel_param *kp = &kparam[i];
 482                 if (kp->perm) {
 483                         pattr->param = kp;
 484                         pattr->mattr.show = param_attr_show;
 485                         pattr->mattr.store = param_attr_store;
 486                         pattr->mattr.attr.name = (char *)&kp->name[name_skip];
 487                         pattr->mattr.attr.owner = mk->mod;
 488                         pattr->mattr.attr.mode = kp->perm;
 489                         *(gattr++) = &(pattr++)->mattr.attr;
 490                 }
 491         }
 492         *gattr = NULL;
 493
 494         if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
 495                 kfree(mp);
 496                 return ERR_PTR(err);
 497         }
 498         return mp;
 499 }
 500
 501
 502 #ifdef CONFIG_MODULES
 503
 504 /*
 505  * module_param_sysfs_setup - setup sysfs support for one module
 506  * @mod: module
 507  * @kparam: module parameters (array)
 508  * @num_params: number of module parameters
 509  *
 510  * Adds sysfs entries for module parameters, and creates a link from
 511  * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
 512  */
 513 int module_param_sysfs_setup(struct module *mod,
 514                              struct kernel_param *kparam,
 515                              unsigned int num_params)
 516 {
 517         struct module_param_attrs *mp;
 518
 519         mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
 520         if (IS_ERR(mp))
 521                 return PTR_ERR(mp);
 522
 523         mod->param_attrs = mp;
 524         return 0;
 525 }
 526
 527 /*
 528  * module_param_sysfs_remove - remove sysfs support for one module
 529  * @mod: module
 530  *
 531  * Remove sysfs entries for module parameters and the corresponding
 532  * kobject.
 533  */
 534 void module_param_sysfs_remove(struct module *mod)
 535 {
 536         if (mod->param_attrs) {
 537                 sysfs_remove_group(&mod->mkobj.kobj,
 538                                    &mod->param_attrs->grp);
 539                 /* We are positive that no one is using any param
 540                  * attrs at this point.  Deallocate immediately. */
 541                 kfree(mod->param_attrs);
 542                 mod->param_attrs = NULL;
 543         }
 544 }
 545 #endif
 546
 547 /*
 548  * kernel_param_sysfs_setup - wrapper for built-in params support
 549  */
 550 static void __init kernel_param_sysfs_setup(const char *name,
 551                                             struct kernel_param *kparam,
 552                                             unsigned int num_params,
 553                                             unsigned int name_skip)
 554 {
 555         struct module_kobject *mk;
 556         int ret;
 557
 558         mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
 559         BUG_ON(!mk);
 560
 561         mk->mod = THIS_MODULE;
 562         kobj_set_kset_s(mk, module_subsys);
 563         kobject_set_name(&mk->kobj, name);
 564         ret = kobject_register(&mk->kobj);
 565         BUG_ON(ret < 0);
 566
 567         /* no need to keep the kobject if no parameter is exported */
 568         if (!param_sysfs_setup(mk, kparam, num_params, name_skip)) {
 569                 kobject_unregister(&mk->kobj);
 570                 kfree(mk);
 571         }
 572 }
 573
 574 /*
 575  * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
 576  *
 577  * Add module_parameters to sysfs for "modules" built into the kernel.
 578  *
 579  * The "module" name (KBUILD_MODNAME) is stored before a dot, the
 580  * "parameter" name is stored behind a dot in kernel_param->name. So,
 581  * extract the "module" name for all built-in kernel_param-eters,
 582  * and for all who have the same, call kernel_param_sysfs_setup.
 583  */
 584 static void __init param_sysfs_builtin(void)
 585 {
 586         struct kernel_param *kp, *kp_begin = NULL;
 587         unsigned int i, name_len, count = 0;
 588         char modname[MAX_KBUILD_MODNAME + 1] = "";
 589
 590         for (i=0; i < __stop___param - __start___param; i++) {
 591                 char *dot;
 592
 593                 kp = &__start___param[i];
 594
 595                 /* We do not handle args without periods. */
 596                 dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
 597                 if (!dot) {
 598                         DEBUGP("couldn't find period in %s\n", kp->name);
 599                         continue;
 600                 }
 601                 name_len = dot - kp->name;
 602
 603                 /* new kbuild_modname? */
 604                 if (strlen(modname) != name_len
 605                     || strncmp(modname, kp->name, name_len) != 0) {
 606                         /* add a new kobject for previous kernel_params. */
 607                         if (count)
 608                                 kernel_param_sysfs_setup(modname,
 609                                                          kp_begin,
 610                                                          count,
 611                                                          strlen(modname)+1);
 612
 613                         strncpy(modname, kp->name, name_len);
 614                         modname[name_len] = '\0';
 615                         count = 0;
 616                         kp_begin = kp;
 617                 }
 618                 count++;
 619         }
 620
 621         /* last kernel_params need to be registered as well */
 622         if (count)
 623                 kernel_param_sysfs_setup(modname, kp_begin, count,
 624                                          strlen(modname)+1);
 625 }
 626
 627
 628 /* module-related sysfs stuff */
 629 #ifdef CONFIG_SYSFS
 630
 631 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
 632 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
 633
 634 static ssize_t module_attr_show(struct kobject *kobj,
 635                                 struct attribute *attr,
 636                                 char *buf)
 637 {
 638         struct module_attribute *attribute;
 639         struct module_kobject *mk;
 640         int ret;
 641
 642         attribute = to_module_attr(attr);
 643         mk = to_module_kobject(kobj);
 644
 645         if (!attribute->show)
 646                 return -EIO;
 647
 648         ret = attribute->show(attribute, mk->mod, buf);
 649
 650         return ret;
 651 }
 652
 653 static ssize_t module_attr_store(struct kobject *kobj,
 654                                 struct attribute *attr,
 655                                 const char *buf, size_t len)
 656 {
 657         struct module_attribute *attribute;
 658         struct module_kobject *mk;
 659         int ret;
 660
 661         attribute = to_module_attr(attr);
 662         mk = to_module_kobject(kobj);
 663
 664         if (!attribute->store)
 665                 return -EIO;
 666
 667         ret = attribute->store(attribute, mk->mod, buf, len);
 668
 669         return ret;
 670 }
 671
 672 static struct sysfs_ops module_sysfs_ops = {
 673         .show = module_attr_show,
 674         .store = module_attr_store,
 675 };
 676
 677 #else
 678 static struct sysfs_ops module_sysfs_ops = {
 679         .show = NULL,
 680         .store = NULL,
 681 };
 682 #endif
 683
 684 static struct kobj_type module_ktype = {
 685         .sysfs_ops =    &module_sysfs_ops,
 686 };
 687
 688 decl_subsys(module, &module_ktype, NULL);
 689
 690 /*
 691  * param_sysfs_init - wrapper for built-in params support
 692  */
 693 static int __init param_sysfs_init(void)
 694 {
 695         int ret;
 696
 697         ret = subsystem_register(&module_subsys);
 698         if (ret < 0) {
 699                 printk(KERN_WARNING "%s (%d): subsystem_register error: %d\n",
 700                         __FILE__, __LINE__, ret);
 701                 return ret;
 702         }
 703
 704         param_sysfs_builtin();
 705
 706         return 0;
 707 }
 708 subsys_initcall(param_sysfs_init);
 709
 710 EXPORT_SYMBOL(param_set_byte);
 711 EXPORT_SYMBOL(param_get_byte);
 712 EXPORT_SYMBOL(param_set_short);
 713 EXPORT_SYMBOL(param_get_short);
 714 EXPORT_SYMBOL(param_set_ushort);
 715 EXPORT_SYMBOL(param_get_ushort);
 716 EXPORT_SYMBOL(param_set_int);
 717 EXPORT_SYMBOL(param_get_int);
 718 EXPORT_SYMBOL(param_set_uint);
 719 EXPORT_SYMBOL(param_get_uint);
 720 EXPORT_SYMBOL(param_set_long);
 721 EXPORT_SYMBOL(param_get_long);
 722 EXPORT_SYMBOL(param_set_ulong);
 723 EXPORT_SYMBOL(param_get_ulong);
 724 EXPORT_SYMBOL(param_set_charp);
 725 EXPORT_SYMBOL(param_get_charp);
 726 EXPORT_SYMBOL(param_set_bool);
 727 EXPORT_SYMBOL(param_get_bool);
 728 EXPORT_SYMBOL(param_set_invbool);
 729 EXPORT_SYMBOL(param_get_invbool);
 730 EXPORT_SYMBOL(param_array_set);
 731 EXPORT_SYMBOL(param_array_get);
 732 EXPORT_SYMBOL(param_set_copystring);
 733 EXPORT_SYMBOL(param_get_string);