xref: /openbmc/linux/kernel/params.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 break the rule and 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 (!val) {
360 		printk(KERN_ERR "%s: missing param set value\n", kp->name);
361 		return -EINVAL;
362 	}
363 	if (strlen(val)+1 > kps->maxlen) {
364 		printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
365 		       kp->name, kps->maxlen-1);
366 		return -ENOSPC;
367 	}
368 	strcpy(kps->string, val);
369 	return 0;
370 }
371 
372 int param_get_string(char *buffer, struct kernel_param *kp)
373 {
374 	struct kparam_string *kps = kp->arg;
375 	return strlcpy(buffer, kps->string, kps->maxlen);
376 }
377 
378 /* sysfs output in /sys/modules/XYZ/parameters/ */
379 
380 extern struct kernel_param __start___param[], __stop___param[];
381 
382 #define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
383 
384 struct param_attribute
385 {
386 	struct module_attribute mattr;
387 	struct kernel_param *param;
388 };
389 
390 struct module_param_attrs
391 {
392 	struct attribute_group grp;
393 	struct param_attribute attrs[0];
394 };
395 
396 #ifdef CONFIG_SYSFS
397 #define to_param_attr(n) container_of(n, struct param_attribute, mattr);
398 
399 static ssize_t param_attr_show(struct module_attribute *mattr,
400 			       struct module *mod, char *buf)
401 {
402 	int count;
403 	struct param_attribute *attribute = to_param_attr(mattr);
404 
405 	if (!attribute->param->get)
406 		return -EPERM;
407 
408 	count = attribute->param->get(buf, attribute->param);
409 	if (count > 0) {
410 		strcat(buf, "\n");
411 		++count;
412 	}
413 	return count;
414 }
415 
416 /* sysfs always hands a nul-terminated string in buf.  We rely on that. */
417 static ssize_t param_attr_store(struct module_attribute *mattr,
418 				struct module *owner,
419 				const char *buf, size_t len)
420 {
421  	int err;
422 	struct param_attribute *attribute = to_param_attr(mattr);
423 
424 	if (!attribute->param->set)
425 		return -EPERM;
426 
427 	err = attribute->param->set(buf, attribute->param);
428 	if (!err)
429 		return len;
430 	return err;
431 }
432 #endif
433 
434 #ifdef CONFIG_MODULES
435 #define __modinit
436 #else
437 #define __modinit __init
438 #endif
439 
440 #ifdef CONFIG_SYSFS
441 /*
442  * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
443  * @mk: struct module_kobject (contains parent kobject)
444  * @kparam: array of struct kernel_param, the actual parameter definitions
445  * @num_params: number of entries in array
446  * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
447  *
448  * Create a kobject for a (per-module) group of parameters, and create files
449  * in sysfs. A pointer to the param_kobject is returned on success,
450  * NULL if there's no parameter to export, or other ERR_PTR(err).
451  */
452 static __modinit struct module_param_attrs *
453 param_sysfs_setup(struct module_kobject *mk,
454 		  struct kernel_param *kparam,
455 		  unsigned int num_params,
456 		  unsigned int name_skip)
457 {
458 	struct module_param_attrs *mp;
459 	unsigned int valid_attrs = 0;
460 	unsigned int i, size[2];
461 	struct param_attribute *pattr;
462 	struct attribute **gattr;
463 	int err;
464 
465 	for (i=0; i<num_params; i++) {
466 		if (kparam[i].perm)
467 			valid_attrs++;
468 	}
469 
470 	if (!valid_attrs)
471 		return NULL;
472 
473 	size[0] = ALIGN(sizeof(*mp) +
474 			valid_attrs * sizeof(mp->attrs[0]),
475 			sizeof(mp->grp.attrs[0]));
476 	size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
477 
478 	mp = kmalloc(size[0] + size[1], GFP_KERNEL);
479 	if (!mp)
480 		return ERR_PTR(-ENOMEM);
481 
482 	mp->grp.name = "parameters";
483 	mp->grp.attrs = (void *)mp + size[0];
484 
485 	pattr = &mp->attrs[0];
486 	gattr = &mp->grp.attrs[0];
487 	for (i = 0; i < num_params; i++) {
488 		struct kernel_param *kp = &kparam[i];
489 		if (kp->perm) {
490 			pattr->param = kp;
491 			pattr->mattr.show = param_attr_show;
492 			pattr->mattr.store = param_attr_store;
493 			pattr->mattr.attr.name = (char *)&kp->name[name_skip];
494 			pattr->mattr.attr.owner = mk->mod;
495 			pattr->mattr.attr.mode = kp->perm;
496 			*(gattr++) = &(pattr++)->mattr.attr;
497 		}
498 	}
499 	*gattr = NULL;
500 
501 	if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
502 		kfree(mp);
503 		return ERR_PTR(err);
504 	}
505 	return mp;
506 }
507 
508 #ifdef CONFIG_MODULES
509 /*
510  * module_param_sysfs_setup - setup sysfs support for one module
511  * @mod: module
512  * @kparam: module parameters (array)
513  * @num_params: number of module parameters
514  *
515  * Adds sysfs entries for module parameters, and creates a link from
516  * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
517  */
518 int module_param_sysfs_setup(struct module *mod,
519 			     struct kernel_param *kparam,
520 			     unsigned int num_params)
521 {
522 	struct module_param_attrs *mp;
523 
524 	mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
525 	if (IS_ERR(mp))
526 		return PTR_ERR(mp);
527 
528 	mod->param_attrs = mp;
529 	return 0;
530 }
531 
532 /*
533  * module_param_sysfs_remove - remove sysfs support for one module
534  * @mod: module
535  *
536  * Remove sysfs entries for module parameters and the corresponding
537  * kobject.
538  */
539 void module_param_sysfs_remove(struct module *mod)
540 {
541 	if (mod->param_attrs) {
542 		sysfs_remove_group(&mod->mkobj.kobj,
543 				   &mod->param_attrs->grp);
544 		/* We are positive that no one is using any param
545 		 * attrs at this point.  Deallocate immediately. */
546 		kfree(mod->param_attrs);
547 		mod->param_attrs = NULL;
548 	}
549 }
550 #endif
551 
552 /*
553  * kernel_param_sysfs_setup - wrapper for built-in params support
554  */
555 static void __init kernel_param_sysfs_setup(const char *name,
556 					    struct kernel_param *kparam,
557 					    unsigned int num_params,
558 					    unsigned int name_skip)
559 {
560 	struct module_kobject *mk;
561 	int ret;
562 
563 	mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
564 	BUG_ON(!mk);
565 
566 	mk->mod = THIS_MODULE;
567 	kobj_set_kset_s(mk, module_subsys);
568 	kobject_set_name(&mk->kobj, name);
569 	kobject_init(&mk->kobj);
570 	ret = kobject_add(&mk->kobj);
571 	BUG_ON(ret < 0);
572 	param_sysfs_setup(mk, kparam, num_params, name_skip);
573 	kobject_uevent(&mk->kobj, KOBJ_ADD);
574 }
575 
576 /*
577  * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
578  *
579  * Add module_parameters to sysfs for "modules" built into the kernel.
580  *
581  * The "module" name (KBUILD_MODNAME) is stored before a dot, the
582  * "parameter" name is stored behind a dot in kernel_param->name. So,
583  * extract the "module" name for all built-in kernel_param-eters,
584  * and for all who have the same, call kernel_param_sysfs_setup.
585  */
586 static void __init param_sysfs_builtin(void)
587 {
588 	struct kernel_param *kp, *kp_begin = NULL;
589 	unsigned int i, name_len, count = 0;
590 	char modname[MAX_KBUILD_MODNAME + 1] = "";
591 
592 	for (i=0; i < __stop___param - __start___param; i++) {
593 		char *dot;
594 
595 		kp = &__start___param[i];
596 
597 		/* We do not handle args without periods. */
598 		dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
599 		if (!dot) {
600 			DEBUGP("couldn't find period in %s\n", kp->name);
601 			continue;
602 		}
603 		name_len = dot - kp->name;
604 
605  		/* new kbuild_modname? */
606 		if (strlen(modname) != name_len
607 		    || strncmp(modname, kp->name, name_len) != 0) {
608 			/* add a new kobject for previous kernel_params. */
609 			if (count)
610 				kernel_param_sysfs_setup(modname,
611 							 kp_begin,
612 							 count,
613 							 strlen(modname)+1);
614 
615 			strncpy(modname, kp->name, name_len);
616 			modname[name_len] = '\0';
617 			count = 0;
618 			kp_begin = kp;
619 		}
620 		count++;
621 	}
622 
623 	/* last kernel_params need to be registered as well */
624 	if (count)
625 		kernel_param_sysfs_setup(modname, kp_begin, count,
626 					 strlen(modname)+1);
627 }
628 
629 
630 /* module-related sysfs stuff */
631 
632 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
633 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
634 
635 static ssize_t module_attr_show(struct kobject *kobj,
636 				struct attribute *attr,
637 				char *buf)
638 {
639 	struct module_attribute *attribute;
640 	struct module_kobject *mk;
641 	int ret;
642 
643 	attribute = to_module_attr(attr);
644 	mk = to_module_kobject(kobj);
645 
646 	if (!attribute->show)
647 		return -EIO;
648 
649 	ret = attribute->show(attribute, mk->mod, buf);
650 
651 	return ret;
652 }
653 
654 static ssize_t module_attr_store(struct kobject *kobj,
655 				struct attribute *attr,
656 				const char *buf, size_t len)
657 {
658 	struct module_attribute *attribute;
659 	struct module_kobject *mk;
660 	int ret;
661 
662 	attribute = to_module_attr(attr);
663 	mk = to_module_kobject(kobj);
664 
665 	if (!attribute->store)
666 		return -EIO;
667 
668 	ret = attribute->store(attribute, mk->mod, buf, len);
669 
670 	return ret;
671 }
672 
673 static struct sysfs_ops module_sysfs_ops = {
674 	.show = module_attr_show,
675 	.store = module_attr_store,
676 };
677 
678 static struct kobj_type module_ktype;
679 
680 static int uevent_filter(struct kset *kset, struct kobject *kobj)
681 {
682 	struct kobj_type *ktype = get_ktype(kobj);
683 
684 	if (ktype == &module_ktype)
685 		return 1;
686 	return 0;
687 }
688 
689 static struct kset_uevent_ops module_uevent_ops = {
690 	.filter = uevent_filter,
691 };
692 
693 decl_subsys(module, &module_ktype, &module_uevent_ops);
694 int module_sysfs_initialized;
695 
696 static struct kobj_type module_ktype = {
697 	.sysfs_ops =	&module_sysfs_ops,
698 };
699 
700 /*
701  * param_sysfs_init - wrapper for built-in params support
702  */
703 static int __init param_sysfs_init(void)
704 {
705 	int ret;
706 
707 	ret = subsystem_register(&module_subsys);
708 	if (ret < 0) {
709 		printk(KERN_WARNING "%s (%d): subsystem_register error: %d\n",
710 			__FILE__, __LINE__, ret);
711 		return ret;
712 	}
713 	module_sysfs_initialized = 1;
714 
715 	param_sysfs_builtin();
716 
717 	return 0;
718 }
719 subsys_initcall(param_sysfs_init);
720 
721 #else
722 #if 0
723 static struct sysfs_ops module_sysfs_ops = {
724 	.show = NULL,
725 	.store = NULL,
726 };
727 #endif
728 #endif
729 
730 EXPORT_SYMBOL(param_set_byte);
731 EXPORT_SYMBOL(param_get_byte);
732 EXPORT_SYMBOL(param_set_short);
733 EXPORT_SYMBOL(param_get_short);
734 EXPORT_SYMBOL(param_set_ushort);
735 EXPORT_SYMBOL(param_get_ushort);
736 EXPORT_SYMBOL(param_set_int);
737 EXPORT_SYMBOL(param_get_int);
738 EXPORT_SYMBOL(param_set_uint);
739 EXPORT_SYMBOL(param_get_uint);
740 EXPORT_SYMBOL(param_set_long);
741 EXPORT_SYMBOL(param_get_long);
742 EXPORT_SYMBOL(param_set_ulong);
743 EXPORT_SYMBOL(param_get_ulong);
744 EXPORT_SYMBOL(param_set_charp);
745 EXPORT_SYMBOL(param_get_charp);
746 EXPORT_SYMBOL(param_set_bool);
747 EXPORT_SYMBOL(param_get_bool);
748 EXPORT_SYMBOL(param_set_invbool);
749 EXPORT_SYMBOL(param_get_invbool);
750 EXPORT_SYMBOL(param_array_set);
751 EXPORT_SYMBOL(param_array_get);
752 EXPORT_SYMBOL(param_set_copystring);
753 EXPORT_SYMBOL(param_get_string);
754