blob: 65aae11eb93f1fab5a4673ca9e9d4df9f2582e8e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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*/
Paul Gortmaker72a59aa2011-05-26 21:07:10 -040018#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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>
Tim Schmielau4e57b682005-10-30 15:03:48 -080025#include <linux/slab.h>
Peter Oberparleiter26d052b2009-07-06 17:11:22 +020026#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#if 0
29#define DEBUGP printk
30#else
31#define DEBUGP(fmt, a...)
32#endif
33
Rusty Russell907b29e2010-08-11 23:04:19 -060034/* Protects all parameters, and incidentally kmalloced_param list. */
35static DEFINE_MUTEX(param_lock);
36
Rusty Russella1054322010-08-11 23:04:18 -060037/* This just allows us to keep track of which parameters are kmalloced. */
38struct kmalloced_param {
39 struct list_head list;
40 char val[];
41};
Rusty Russella1054322010-08-11 23:04:18 -060042static LIST_HEAD(kmalloced_params);
43
44static void *kmalloc_parameter(unsigned int size)
45{
46 struct kmalloced_param *p;
47
48 p = kmalloc(sizeof(*p) + size, GFP_KERNEL);
49 if (!p)
50 return NULL;
51
Rusty Russella1054322010-08-11 23:04:18 -060052 list_add(&p->list, &kmalloced_params);
Rusty Russella1054322010-08-11 23:04:18 -060053 return p->val;
54}
55
56/* Does nothing if parameter wasn't kmalloced above. */
57static void maybe_kfree_parameter(void *param)
58{
59 struct kmalloced_param *p;
60
Rusty Russella1054322010-08-11 23:04:18 -060061 list_for_each_entry(p, &kmalloced_params, list) {
62 if (p->val == param) {
63 list_del(&p->list);
64 kfree(p);
65 break;
66 }
67 }
Rusty Russella1054322010-08-11 23:04:18 -060068}
69
Michal Schmidtb1e4d202011-10-10 00:03:37 +020070static char dash2underscore(char c)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 if (c == '-')
73 return '_';
74 return c;
75}
76
Michal Schmidtb1e4d202011-10-10 00:03:37 +020077bool parameqn(const char *a, const char *b, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Michal Schmidtb1e4d202011-10-10 00:03:37 +020079 size_t i;
80
81 for (i = 0; i < n; i++) {
82 if (dash2underscore(a[i]) != dash2underscore(b[i]))
83 return false;
84 }
85 return true;
86}
87
88bool parameq(const char *a, const char *b)
89{
90 return parameqn(a, b, strlen(a)+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93static int parse_one(char *param,
94 char *val,
Rusty Russell914dcaa2010-08-11 23:04:18 -060095 const struct kernel_param *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 unsigned num_params,
97 int (*handle_unknown)(char *param, char *val))
98{
99 unsigned int i;
Rusty Russell907b29e2010-08-11 23:04:19 -0600100 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102 /* Find parameter */
103 for (i = 0; i < num_params; i++) {
104 if (parameq(param, params[i].name)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300105 /* No one handled NULL, so do it here. */
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600106 if (!val && params[i].ops->set != param_set_bool)
Rusty Russell2e9fb992010-08-11 23:04:10 -0600107 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 DEBUGP("They are equal! Calling %p\n",
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600109 params[i].ops->set);
Rusty Russell907b29e2010-08-11 23:04:19 -0600110 mutex_lock(&param_lock);
111 err = params[i].ops->set(val, &params[i]);
112 mutex_unlock(&param_lock);
113 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
115 }
116
117 if (handle_unknown) {
118 DEBUGP("Unknown argument: calling %p\n", handle_unknown);
119 return handle_unknown(param, val);
120 }
121
122 DEBUGP("Unknown argument `%s'\n", param);
123 return -ENOENT;
124}
125
126/* You can use " around spaces, but can't escape ". */
127/* Hyphens and underscores equivalent in parameter names. */
128static char *next_arg(char *args, char **param, char **val)
129{
130 unsigned int i, equals = 0;
131 int in_quote = 0, quoted = 0;
132 char *next;
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (*args == '"') {
135 args++;
136 in_quote = 1;
137 quoted = 1;
138 }
139
140 for (i = 0; args[i]; i++) {
Peter Oberparleiter26d052b2009-07-06 17:11:22 +0200141 if (isspace(args[i]) && !in_quote)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 break;
143 if (equals == 0) {
144 if (args[i] == '=')
145 equals = i;
146 }
147 if (args[i] == '"')
148 in_quote = !in_quote;
149 }
150
151 *param = args;
152 if (!equals)
153 *val = NULL;
154 else {
155 args[equals] = '\0';
156 *val = args + equals + 1;
157
158 /* Don't include quotes in value. */
159 if (**val == '"') {
160 (*val)++;
161 if (args[i-1] == '"')
162 args[i-1] = '\0';
163 }
164 if (quoted && args[i-1] == '"')
165 args[i-1] = '\0';
166 }
167
168 if (args[i]) {
169 args[i] = '\0';
170 next = args + i + 1;
171 } else
172 next = args + i;
Rusty Russellf36462f2005-09-27 21:45:34 -0700173
174 /* Chew up trailing spaces. */
André Goddard Rosae7d28602009-12-14 18:01:06 -0800175 return skip_spaces(next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
178/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
179int parse_args(const char *name,
180 char *args,
Rusty Russell914dcaa2010-08-11 23:04:18 -0600181 const struct kernel_param *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 unsigned num,
183 int (*unknown)(char *param, char *val))
184{
185 char *param, *val;
186
187 DEBUGP("Parsing ARGS: %s\n", args);
188
Rusty Russellf36462f2005-09-27 21:45:34 -0700189 /* Chew leading spaces */
André Goddard Rosae7d28602009-12-14 18:01:06 -0800190 args = skip_spaces(args);
Rusty Russellf36462f2005-09-27 21:45:34 -0700191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 while (*args) {
193 int ret;
Ard van Breemena416aba2007-01-05 16:36:20 -0800194 int irq_was_disabled;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 args = next_arg(args, &param, &val);
Ard van Breemena416aba2007-01-05 16:36:20 -0800197 irq_was_disabled = irqs_disabled();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 ret = parse_one(param, val, params, num, unknown);
Ard van Breemena416aba2007-01-05 16:36:20 -0800199 if (irq_was_disabled && !irqs_disabled()) {
200 printk(KERN_WARNING "parse_args(): option '%s' enabled "
201 "irq's!\n", param);
202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 switch (ret) {
204 case -ENOENT:
205 printk(KERN_ERR "%s: Unknown parameter `%s'\n",
206 name, param);
207 return ret;
208 case -ENOSPC:
209 printk(KERN_ERR
210 "%s: `%s' too large for parameter `%s'\n",
211 name, val ?: "", param);
212 return ret;
213 case 0:
214 break;
215 default:
216 printk(KERN_ERR
217 "%s: `%s' invalid for parameter `%s'\n",
218 name, val ?: "", param);
219 return ret;
220 }
221 }
222
223 /* All parsed OK. */
224 return 0;
225}
226
227/* Lazy bastard, eh? */
228#define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600229 int param_set_##name(const char *val, const struct kernel_param *kp) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 tmptype l; \
Yi Yang06b2a762008-02-08 04:21:57 -0800232 int ret; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 \
Yi Yang06b2a762008-02-08 04:21:57 -0800234 ret = strtolfn(val, 0, &l); \
Satoru Moriya81c74132011-05-26 19:38:04 -0400235 if (ret < 0 || ((type)l != l)) \
236 return ret < 0 ? ret : -EINVAL; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 *((type *)kp->arg) = l; \
238 return 0; \
239 } \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600240 int param_get_##name(char *buffer, const struct kernel_param *kp) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 { \
242 return sprintf(buffer, format, *((type *)kp->arg)); \
Rusty Russella14fe242010-08-11 23:04:11 -0600243 } \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600244 struct kernel_param_ops param_ops_##name = { \
245 .set = param_set_##name, \
246 .get = param_get_##name, \
247 }; \
Rusty Russella14fe242010-08-11 23:04:11 -0600248 EXPORT_SYMBOL(param_set_##name); \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600249 EXPORT_SYMBOL(param_get_##name); \
250 EXPORT_SYMBOL(param_ops_##name)
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Yi Yang06b2a762008-02-08 04:21:57 -0800253STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
254STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
255STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
256STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
257STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
258STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
259STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600261int param_set_charp(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 if (strlen(val) > 1024) {
264 printk(KERN_ERR "%s: string parameter too long\n",
265 kp->name);
266 return -ENOSPC;
267 }
268
Rusty Russella1054322010-08-11 23:04:18 -0600269 maybe_kfree_parameter(*(char **)kp->arg);
270
271 /* This is a hack. We can't kmalloc in early boot, and we
Rusty Russelle180a6b2009-03-31 13:05:29 -0600272 * don't need to; this mangled commandline is preserved. */
273 if (slab_is_available()) {
Rusty Russella1054322010-08-11 23:04:18 -0600274 *(char **)kp->arg = kmalloc_parameter(strlen(val)+1);
Rusty Russelld553ad82009-10-29 08:56:17 -0600275 if (!*(char **)kp->arg)
Rusty Russelle180a6b2009-03-31 13:05:29 -0600276 return -ENOMEM;
Rusty Russella1054322010-08-11 23:04:18 -0600277 strcpy(*(char **)kp->arg, val);
Rusty Russelle180a6b2009-03-31 13:05:29 -0600278 } else
279 *(const char **)kp->arg = val;
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return 0;
282}
Rusty Russella14fe242010-08-11 23:04:11 -0600283EXPORT_SYMBOL(param_set_charp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600285int param_get_charp(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
287 return sprintf(buffer, "%s", *((char **)kp->arg));
288}
Rusty Russella14fe242010-08-11 23:04:11 -0600289EXPORT_SYMBOL(param_get_charp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Rusty Russella1054322010-08-11 23:04:18 -0600291static void param_free_charp(void *arg)
292{
293 maybe_kfree_parameter(*((char **)arg));
294}
295
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600296struct kernel_param_ops param_ops_charp = {
297 .set = param_set_charp,
298 .get = param_get_charp,
Rusty Russella1054322010-08-11 23:04:18 -0600299 .free = param_free_charp,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600300};
301EXPORT_SYMBOL(param_ops_charp);
302
Rusty Russellfddd5202009-06-12 21:46:57 -0600303/* Actually could be a bool or an int, for historical reasons. */
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600304int param_set_bool(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305{
Rusty Russellfddd5202009-06-12 21:46:57 -0600306 bool v;
Jonathan Cameronf721a462011-04-19 12:43:47 +0100307 int ret;
Rusty Russellfddd5202009-06-12 21:46:57 -0600308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 /* No equals means "set"... */
310 if (!val) val = "1";
311
312 /* One of =[yYnN01] */
Jonathan Cameronf721a462011-04-19 12:43:47 +0100313 ret = strtobool(val, &v);
314 if (ret)
315 return ret;
Rusty Russellfddd5202009-06-12 21:46:57 -0600316
317 if (kp->flags & KPARAM_ISBOOL)
318 *(bool *)kp->arg = v;
319 else
320 *(int *)kp->arg = v;
321 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322}
Rusty Russella14fe242010-08-11 23:04:11 -0600323EXPORT_SYMBOL(param_set_bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600325int param_get_bool(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
Rusty Russellfddd5202009-06-12 21:46:57 -0600327 bool val;
328 if (kp->flags & KPARAM_ISBOOL)
329 val = *(bool *)kp->arg;
330 else
331 val = *(int *)kp->arg;
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 /* Y and N chosen as being relatively non-coder friendly */
Rusty Russellfddd5202009-06-12 21:46:57 -0600334 return sprintf(buffer, "%c", val ? 'Y' : 'N');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
Rusty Russella14fe242010-08-11 23:04:11 -0600336EXPORT_SYMBOL(param_get_bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600338struct kernel_param_ops param_ops_bool = {
339 .set = param_set_bool,
340 .get = param_get_bool,
341};
342EXPORT_SYMBOL(param_ops_bool);
343
Rusty Russellfddd5202009-06-12 21:46:57 -0600344/* This one must be bool. */
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600345int param_set_invbool(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
Rusty Russellfddd5202009-06-12 21:46:57 -0600347 int ret;
348 bool boolval;
Jan Beulich22e48ea2007-10-16 23:29:34 -0700349 struct kernel_param dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Jan Beulich22e48ea2007-10-16 23:29:34 -0700351 dummy.arg = &boolval;
Rusty Russellfddd5202009-06-12 21:46:57 -0600352 dummy.flags = KPARAM_ISBOOL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 ret = param_set_bool(val, &dummy);
354 if (ret == 0)
Rusty Russell9a71af22009-06-12 21:46:53 -0600355 *(bool *)kp->arg = !boolval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return ret;
357}
Rusty Russella14fe242010-08-11 23:04:11 -0600358EXPORT_SYMBOL(param_set_invbool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600360int param_get_invbool(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Rusty Russell9a71af22009-06-12 21:46:53 -0600362 return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
Rusty Russella14fe242010-08-11 23:04:11 -0600364EXPORT_SYMBOL(param_get_invbool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600366struct kernel_param_ops param_ops_invbool = {
367 .set = param_set_invbool,
368 .get = param_get_invbool,
369};
370EXPORT_SYMBOL(param_ops_invbool);
371
Bert Wesarg9730b5b2007-05-08 00:28:50 -0700372/* We break the rule and mangle the string. */
Adrian Bunk98717282006-03-25 03:07:06 -0800373static int param_array(const char *name,
374 const char *val,
375 unsigned int min, unsigned int max,
376 void *elem, int elemsize,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600377 int (*set)(const char *, const struct kernel_param *kp),
Rusty Russell3c7d76e2009-10-29 08:56:19 -0600378 u16 flags,
Richard Knutssoneb38a992008-02-06 01:37:50 -0800379 unsigned int *num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
381 int ret;
382 struct kernel_param kp;
383 char save;
384
385 /* Get the name right for errors. */
386 kp.name = name;
387 kp.arg = elem;
Rusty Russell3c7d76e2009-10-29 08:56:19 -0600388 kp.flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 *num = 0;
391 /* We expect a comma-separated list of values. */
392 do {
393 int len;
394
395 if (*num == max) {
396 printk(KERN_ERR "%s: can only take %i arguments\n",
397 name, max);
398 return -EINVAL;
399 }
400 len = strcspn(val, ",");
401
402 /* nul-terminate and parse */
403 save = val[len];
404 ((char *)val)[len] = '\0';
Rusty Russell907b29e2010-08-11 23:04:19 -0600405 BUG_ON(!mutex_is_locked(&param_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 ret = set(val, &kp);
407
408 if (ret != 0)
409 return ret;
410 kp.arg += elemsize;
411 val += len+1;
412 (*num)++;
413 } while (save == ',');
414
415 if (*num < min) {
416 printk(KERN_ERR "%s: needs at least %i arguments\n",
417 name, min);
418 return -EINVAL;
419 }
420 return 0;
421}
422
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600423static int param_array_set(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700425 const struct kparam_array *arr = kp->arr;
Bert Wesarg31143a12005-04-16 15:25:42 -0700426 unsigned int temp_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 return param_array(kp->name, val, 1, arr->max, arr->elem,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600429 arr->elemsize, arr->ops->set, kp->flags,
Rusty Russell3c7d76e2009-10-29 08:56:19 -0600430 arr->num ?: &temp_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600433static int param_array_get(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
435 int i, off, ret;
Jan Beulich22e48ea2007-10-16 23:29:34 -0700436 const struct kparam_array *arr = kp->arr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 struct kernel_param p;
438
439 p = *kp;
440 for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
441 if (i)
442 buffer[off++] = ',';
443 p.arg = arr->elem + arr->elemsize * i;
Rusty Russell907b29e2010-08-11 23:04:19 -0600444 BUG_ON(!mutex_is_locked(&param_lock));
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600445 ret = arr->ops->get(buffer + off, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (ret < 0)
447 return ret;
448 off += ret;
449 }
450 buffer[off] = '\0';
451 return off;
452}
453
Rusty Russelle6df34a2010-08-11 23:04:17 -0600454static void param_array_free(void *arg)
455{
456 unsigned int i;
457 const struct kparam_array *arr = arg;
458
459 if (arr->ops->free)
460 for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
461 arr->ops->free(arr->elem + arr->elemsize * i);
462}
463
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600464struct kernel_param_ops param_array_ops = {
465 .set = param_array_set,
466 .get = param_array_get,
Rusty Russelle6df34a2010-08-11 23:04:17 -0600467 .free = param_array_free,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600468};
469EXPORT_SYMBOL(param_array_ops);
470
471int param_set_copystring(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700473 const struct kparam_string *kps = kp->str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 if (strlen(val)+1 > kps->maxlen) {
476 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
477 kp->name, kps->maxlen-1);
478 return -ENOSPC;
479 }
480 strcpy(kps->string, val);
481 return 0;
482}
Rusty Russella14fe242010-08-11 23:04:11 -0600483EXPORT_SYMBOL(param_set_copystring);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600485int param_get_string(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700487 const struct kparam_string *kps = kp->str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 return strlcpy(buffer, kps->string, kps->maxlen);
489}
Rusty Russella14fe242010-08-11 23:04:11 -0600490EXPORT_SYMBOL(param_get_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600492struct kernel_param_ops param_ops_string = {
493 .set = param_set_copystring,
494 .get = param_get_string,
495};
496EXPORT_SYMBOL(param_ops_string);
497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498/* sysfs output in /sys/modules/XYZ/parameters/ */
Edward Z. Yang350f8252010-02-01 18:26:59 -0500499#define to_module_attr(n) container_of(n, struct module_attribute, attr)
500#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502extern struct kernel_param __start___param[], __stop___param[];
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504struct param_attribute
505{
506 struct module_attribute mattr;
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600507 const struct kernel_param *param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508};
509
510struct module_param_attrs
511{
Rusty Russell9b473de2008-10-22 10:00:22 -0500512 unsigned int num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 struct attribute_group grp;
514 struct param_attribute attrs[0];
515};
516
Randy Dunlapef665c12007-02-13 15:19:06 -0800517#ifdef CONFIG_SYSFS
Edward Z. Yang350f8252010-02-01 18:26:59 -0500518#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520static ssize_t param_attr_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930521 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
523 int count;
524 struct param_attribute *attribute = to_param_attr(mattr);
525
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600526 if (!attribute->param->ops->get)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 return -EPERM;
528
Rusty Russell907b29e2010-08-11 23:04:19 -0600529 mutex_lock(&param_lock);
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600530 count = attribute->param->ops->get(buf, attribute->param);
Rusty Russell907b29e2010-08-11 23:04:19 -0600531 mutex_unlock(&param_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (count > 0) {
533 strcat(buf, "\n");
534 ++count;
535 }
536 return count;
537}
538
539/* sysfs always hands a nul-terminated string in buf. We rely on that. */
540static ssize_t param_attr_store(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930541 struct module_kobject *km,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 const char *buf, size_t len)
543{
544 int err;
545 struct param_attribute *attribute = to_param_attr(mattr);
546
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600547 if (!attribute->param->ops->set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return -EPERM;
549
Rusty Russell907b29e2010-08-11 23:04:19 -0600550 mutex_lock(&param_lock);
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600551 err = attribute->param->ops->set(buf, attribute->param);
Rusty Russell907b29e2010-08-11 23:04:19 -0600552 mutex_unlock(&param_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (!err)
554 return len;
555 return err;
556}
Randy Dunlapef665c12007-02-13 15:19:06 -0800557#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559#ifdef CONFIG_MODULES
560#define __modinit
561#else
562#define __modinit __init
563#endif
564
Randy Dunlapef665c12007-02-13 15:19:06 -0800565#ifdef CONFIG_SYSFS
Rusty Russell907b29e2010-08-11 23:04:19 -0600566void __kernel_param_lock(void)
567{
568 mutex_lock(&param_lock);
569}
570EXPORT_SYMBOL(__kernel_param_lock);
571
572void __kernel_param_unlock(void)
573{
574 mutex_unlock(&param_lock);
575}
576EXPORT_SYMBOL(__kernel_param_unlock);
577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578/*
Rusty Russell9b473de2008-10-22 10:00:22 -0500579 * add_sysfs_param - add a parameter to sysfs
580 * @mk: struct module_kobject
581 * @kparam: the actual parameter definition to add to sysfs
582 * @name: name of parameter
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 *
Rusty Russell9b473de2008-10-22 10:00:22 -0500584 * Create a kobject if for a (per-module) parameter if mp NULL, and
585 * create file in sysfs. Returns an error on out of memory. Always cleans up
586 * if there's an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 */
Rusty Russell9b473de2008-10-22 10:00:22 -0500588static __modinit int add_sysfs_param(struct module_kobject *mk,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600589 const struct kernel_param *kp,
Rusty Russell9b473de2008-10-22 10:00:22 -0500590 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Rusty Russell9b473de2008-10-22 10:00:22 -0500592 struct module_param_attrs *new;
593 struct attribute **attrs;
594 int err, num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Rusty Russell9b473de2008-10-22 10:00:22 -0500596 /* We don't bother calling this with invisible parameters. */
597 BUG_ON(!kp->perm);
598
599 if (!mk->mp) {
600 num = 0;
601 attrs = NULL;
602 } else {
603 num = mk->mp->num;
604 attrs = mk->mp->grp.attrs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 }
606
Rusty Russell9b473de2008-10-22 10:00:22 -0500607 /* Enlarge. */
608 new = krealloc(mk->mp,
609 sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
610 GFP_KERNEL);
611 if (!new) {
612 kfree(mk->mp);
613 err = -ENOMEM;
614 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Rusty Russell9b473de2008-10-22 10:00:22 -0500616 attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
617 if (!attrs) {
618 err = -ENOMEM;
619 goto fail_free_new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
Rusty Russell9b473de2008-10-22 10:00:22 -0500621
622 /* Sysfs wants everything zeroed. */
623 memset(new, 0, sizeof(*new));
624 memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
625 memset(&attrs[num], 0, sizeof(attrs[num]));
626 new->grp.name = "parameters";
627 new->grp.attrs = attrs;
628
629 /* Tack new one on the end. */
Eric W. Biedermana07e4152010-02-11 15:23:05 -0800630 sysfs_attr_init(&new->attrs[num].mattr.attr);
Rusty Russell9b473de2008-10-22 10:00:22 -0500631 new->attrs[num].param = kp;
632 new->attrs[num].mattr.show = param_attr_show;
633 new->attrs[num].mattr.store = param_attr_store;
634 new->attrs[num].mattr.attr.name = (char *)name;
635 new->attrs[num].mattr.attr.mode = kp->perm;
636 new->num = num+1;
637
638 /* Fix up all the pointers, since krealloc can move us */
639 for (num = 0; num < new->num; num++)
640 new->grp.attrs[num] = &new->attrs[num].mattr.attr;
641 new->grp.attrs[num] = NULL;
642
643 mk->mp = new;
644 return 0;
645
646fail_free_new:
647 kfree(new);
648fail:
649 mk->mp = NULL;
650 return err;
651}
652
Linus Torvaldsd2441182008-10-23 12:07:17 -0700653#ifdef CONFIG_MODULES
Rusty Russell9b473de2008-10-22 10:00:22 -0500654static void free_module_param_attrs(struct module_kobject *mk)
655{
656 kfree(mk->mp->grp.attrs);
657 kfree(mk->mp);
658 mk->mp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661/*
662 * module_param_sysfs_setup - setup sysfs support for one module
663 * @mod: module
664 * @kparam: module parameters (array)
665 * @num_params: number of module parameters
666 *
Rusty Russell9b473de2008-10-22 10:00:22 -0500667 * Adds sysfs entries for module parameters under
668 * /sys/module/[mod->name]/parameters/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 */
670int module_param_sysfs_setup(struct module *mod,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600671 const struct kernel_param *kparam,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 unsigned int num_params)
673{
Rusty Russell9b473de2008-10-22 10:00:22 -0500674 int i, err;
675 bool params = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Rusty Russell9b473de2008-10-22 10:00:22 -0500677 for (i = 0; i < num_params; i++) {
678 if (kparam[i].perm == 0)
679 continue;
680 err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
681 if (err)
682 return err;
683 params = true;
684 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Rusty Russell9b473de2008-10-22 10:00:22 -0500686 if (!params)
687 return 0;
688
689 /* Create the param group. */
690 err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
691 if (err)
692 free_module_param_attrs(&mod->mkobj);
693 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694}
695
696/*
697 * module_param_sysfs_remove - remove sysfs support for one module
698 * @mod: module
699 *
700 * Remove sysfs entries for module parameters and the corresponding
701 * kobject.
702 */
703void module_param_sysfs_remove(struct module *mod)
704{
Rusty Russell9b473de2008-10-22 10:00:22 -0500705 if (mod->mkobj.mp) {
706 sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 /* We are positive that no one is using any param
708 * attrs at this point. Deallocate immediately. */
Rusty Russell9b473de2008-10-22 10:00:22 -0500709 free_module_param_attrs(&mod->mkobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 }
711}
712#endif
713
Rusty Russelle180a6b2009-03-31 13:05:29 -0600714void destroy_params(const struct kernel_param *params, unsigned num)
715{
Rusty Russelle6df34a2010-08-11 23:04:17 -0600716 unsigned int i;
717
718 for (i = 0; i < num; i++)
719 if (params[i].ops->free)
720 params[i].ops->free(params[i].arg);
Rusty Russelle180a6b2009-03-31 13:05:29 -0600721}
722
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800723static struct module_kobject * __init locate_module_kobject(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
725 struct module_kobject *mk;
Rusty Russell9b473de2008-10-22 10:00:22 -0500726 struct kobject *kobj;
727 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Rusty Russell9b473de2008-10-22 10:00:22 -0500729 kobj = kset_find_obj(module_kset, name);
730 if (kobj) {
Rusty Russell9b473de2008-10-22 10:00:22 -0500731 mk = to_module_kobject(kobj);
Rusty Russell9b473de2008-10-22 10:00:22 -0500732 } else {
733 mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
734 BUG_ON(!mk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Rusty Russell9b473de2008-10-22 10:00:22 -0500736 mk->mod = THIS_MODULE;
737 mk->kobj.kset = module_kset;
738 err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
739 "%s", name);
Kay Sievers88bfa322011-07-24 22:06:04 +0930740#ifdef CONFIG_MODULES
741 if (!err)
742 err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
743#endif
Rusty Russell9b473de2008-10-22 10:00:22 -0500744 if (err) {
745 kobject_put(&mk->kobj);
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800746 printk(KERN_ERR
747 "Module '%s' failed add to sysfs, error number %d\n",
748 name, err);
749 printk(KERN_ERR
750 "The system will be unstable now.\n");
751 return NULL;
Rusty Russell9b473de2008-10-22 10:00:22 -0500752 }
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800753
754 /* So that we hold reference in both cases. */
Rusty Russell9b473de2008-10-22 10:00:22 -0500755 kobject_get(&mk->kobj);
Greg Kroah-Hartman74c5b592007-07-30 11:26:38 -0700756 }
Rusty Russell9b473de2008-10-22 10:00:22 -0500757
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800758 return mk;
759}
760
761static void __init kernel_add_sysfs_param(const char *name,
762 struct kernel_param *kparam,
763 unsigned int name_skip)
764{
765 struct module_kobject *mk;
766 int err;
767
768 mk = locate_module_kobject(name);
769 if (!mk)
770 return;
771
772 /* We need to remove old parameters before adding more. */
773 if (mk->mp)
774 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
775
Rusty Russell9b473de2008-10-22 10:00:22 -0500776 /* These should not fail at boot. */
777 err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
778 BUG_ON(err);
779 err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
780 BUG_ON(err);
Kay Sieversf30c53a2007-01-15 20:22:02 +0100781 kobject_uevent(&mk->kobj, KOBJ_ADD);
Rusty Russell9b473de2008-10-22 10:00:22 -0500782 kobject_put(&mk->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
785/*
786 * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
787 *
788 * Add module_parameters to sysfs for "modules" built into the kernel.
789 *
790 * The "module" name (KBUILD_MODNAME) is stored before a dot, the
791 * "parameter" name is stored behind a dot in kernel_param->name. So,
792 * extract the "module" name for all built-in kernel_param-eters,
Rusty Russell9b473de2008-10-22 10:00:22 -0500793 * and for all who have the same, call kernel_add_sysfs_param.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 */
795static void __init param_sysfs_builtin(void)
796{
Rusty Russell9b473de2008-10-22 10:00:22 -0500797 struct kernel_param *kp;
798 unsigned int name_len;
799 char modname[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Rusty Russell9b473de2008-10-22 10:00:22 -0500801 for (kp = __start___param; kp < __stop___param; kp++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 char *dot;
803
Rusty Russell9b473de2008-10-22 10:00:22 -0500804 if (kp->perm == 0)
805 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Rusty Russell730b69d2008-10-22 10:00:22 -0500807 dot = strchr(kp->name, '.');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 if (!dot) {
Rusty Russell67e67ce2008-10-22 10:00:23 -0500809 /* This happens for core_param() */
810 strcpy(modname, "kernel");
811 name_len = 0;
812 } else {
813 name_len = dot - kp->name + 1;
814 strlcpy(modname, kp->name, name_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
Rusty Russell67e67ce2008-10-22 10:00:23 -0500816 kernel_add_sysfs_param(modname, kp, name_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818}
819
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800820ssize_t __modver_version_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930821 struct module_kobject *mk, char *buf)
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800822{
823 struct module_version_attribute *vattr =
824 container_of(mattr, struct module_version_attribute, mattr);
825
826 return sprintf(buf, "%s\n", vattr->version);
827}
828
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800829extern const struct module_version_attribute *__start___modver[];
830extern const struct module_version_attribute *__stop___modver[];
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800831
832static void __init version_sysfs_builtin(void)
833{
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800834 const struct module_version_attribute **p;
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800835 struct module_kobject *mk;
836 int err;
837
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800838 for (p = __start___modver; p < __stop___modver; p++) {
839 const struct module_version_attribute *vattr = *p;
840
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800841 mk = locate_module_kobject(vattr->module_name);
842 if (mk) {
843 err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
844 kobject_uevent(&mk->kobj, KOBJ_ADD);
845 kobject_put(&mk->kobj);
846 }
847 }
848}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
850/* module-related sysfs stuff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852static ssize_t module_attr_show(struct kobject *kobj,
853 struct attribute *attr,
854 char *buf)
855{
856 struct module_attribute *attribute;
857 struct module_kobject *mk;
858 int ret;
859
860 attribute = to_module_attr(attr);
861 mk = to_module_kobject(kobj);
862
863 if (!attribute->show)
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500864 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Kay Sievers4befb022011-07-24 22:06:04 +0930866 ret = attribute->show(attribute, mk, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 return ret;
869}
870
871static ssize_t module_attr_store(struct kobject *kobj,
872 struct attribute *attr,
873 const char *buf, size_t len)
874{
875 struct module_attribute *attribute;
876 struct module_kobject *mk;
877 int ret;
878
879 attribute = to_module_attr(attr);
880 mk = to_module_kobject(kobj);
881
882 if (!attribute->store)
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500883 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Kay Sievers4befb022011-07-24 22:06:04 +0930885 ret = attribute->store(attribute, mk, buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 return ret;
888}
889
Emese Revfy52cf25d2010-01-19 02:58:23 +0100890static const struct sysfs_ops module_sysfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 .show = module_attr_show,
892 .store = module_attr_store,
893};
894
Kay Sievers270a6c42007-01-18 13:26:15 +0100895static int uevent_filter(struct kset *kset, struct kobject *kobj)
896{
897 struct kobj_type *ktype = get_ktype(kobj);
898
899 if (ktype == &module_ktype)
900 return 1;
901 return 0;
902}
903
Emese Revfy9cd43612009-12-31 14:52:51 +0100904static const struct kset_uevent_ops module_uevent_ops = {
Kay Sievers270a6c42007-01-18 13:26:15 +0100905 .filter = uevent_filter,
906};
907
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700908struct kset *module_kset;
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700909int module_sysfs_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700911struct kobj_type module_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 .sysfs_ops = &module_sysfs_ops,
913};
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915/*
916 * param_sysfs_init - wrapper for built-in params support
917 */
918static int __init param_sysfs_init(void)
919{
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700920 module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
921 if (!module_kset) {
922 printk(KERN_WARNING "%s (%d): error creating kset\n",
923 __FILE__, __LINE__);
924 return -ENOMEM;
Randy Dunlapd8c76492006-09-29 01:58:55 -0700925 }
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700926 module_sysfs_initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800928 version_sysfs_builtin();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 param_sysfs_builtin();
930
931 return 0;
932}
Mark Huangd10be6d2006-09-29 01:59:34 -0700933subsys_initcall(param_sysfs_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700935#endif /* CONFIG_SYSFS */