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64db4cff PM |
1 | /* |
2 | * Read-Copy Update tracing for classic implementation | |
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 | * Copyright IBM Corporation, 2008 | |
19 | * | |
20 | * Papers: http://www.rdrop.com/users/paulmck/RCU | |
21 | * | |
22 | * For detailed explanation of Read-Copy Update mechanism see - | |
a71fca58 | 23 | * Documentation/RCU |
64db4cff PM |
24 | * |
25 | */ | |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/smp.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/sched.h> | |
60063497 | 34 | #include <linux/atomic.h> |
64db4cff PM |
35 | #include <linux/bitops.h> |
36 | #include <linux/module.h> | |
37 | #include <linux/completion.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/percpu.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/mutex.h> | |
43 | #include <linux/debugfs.h> | |
44 | #include <linux/seq_file.h> | |
45 | ||
9f77da9f | 46 | #define RCU_TREE_NONCORE |
6258c4fb IM |
47 | #include "rcutree.h" |
48 | ||
42c3533e PM |
49 | #define ulong2long(a) (*(long *)(&(a))) |
50 | ||
374b928e MW |
51 | static int r_open(struct inode *inode, struct file *file, |
52 | const struct seq_operations *op) | |
53 | { | |
54 | int ret = seq_open(file, op); | |
55 | if (!ret) { | |
56 | struct seq_file *m = (struct seq_file *)file->private_data; | |
57 | m->private = inode->i_private; | |
58 | } | |
59 | return ret; | |
60 | } | |
61 | ||
62 | static void *r_start(struct seq_file *m, loff_t *pos) | |
63 | { | |
64 | struct rcu_state *rsp = (struct rcu_state *)m->private; | |
65 | *pos = cpumask_next(*pos - 1, cpu_possible_mask); | |
66 | if ((*pos) < nr_cpu_ids) | |
67 | return per_cpu_ptr(rsp->rda, *pos); | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | static void *r_next(struct seq_file *m, void *v, loff_t *pos) | |
72 | { | |
73 | (*pos)++; | |
74 | return r_start(m, pos); | |
75 | } | |
76 | ||
77 | static void r_stop(struct seq_file *m, void *v) | |
78 | { | |
79 | } | |
80 | ||
d7e187c8 PM |
81 | static int show_rcubarrier(struct seq_file *m, void *unused) |
82 | { | |
c0cc962d PM |
83 | struct rcu_state *rsp; |
84 | ||
85 | for_each_rcu_flavor(rsp) | |
1331e7a1 PM |
86 | seq_printf(m, "%s: bcc: %d nbd: %lu\n", |
87 | rsp->name, | |
c0cc962d PM |
88 | atomic_read(&rsp->barrier_cpu_count), |
89 | rsp->n_barrier_done); | |
d7e187c8 PM |
90 | return 0; |
91 | } | |
92 | ||
93 | static int rcubarrier_open(struct inode *inode, struct file *file) | |
94 | { | |
95 | return single_open(file, show_rcubarrier, NULL); | |
96 | } | |
97 | ||
98 | static const struct file_operations rcubarrier_fops = { | |
99 | .owner = THIS_MODULE, | |
100 | .open = rcubarrier_open, | |
101 | .read = seq_read, | |
102 | .llseek = seq_lseek, | |
103 | .release = single_release, | |
104 | }; | |
105 | ||
c25e557f MW |
106 | static int new_show_rcubarrier(struct seq_file *m, void *v) |
107 | { | |
108 | struct rcu_state *rsp = (struct rcu_state *)m->private; | |
109 | seq_printf(m, "bcc: %d nbd: %lu\n", | |
110 | atomic_read(&rsp->barrier_cpu_count), | |
111 | rsp->n_barrier_done); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static int new_rcubarrier_open(struct inode *inode, struct file *file) | |
116 | { | |
117 | return single_open(file, new_show_rcubarrier, inode->i_private); | |
118 | } | |
119 | ||
120 | static const struct file_operations new_rcubarrier_fops = { | |
121 | .owner = THIS_MODULE, | |
122 | .open = new_rcubarrier_open, | |
123 | .read = seq_read, | |
124 | .llseek = no_llseek, | |
125 | .release = seq_release, | |
126 | }; | |
127 | ||
a46e0899 PM |
128 | #ifdef CONFIG_RCU_BOOST |
129 | ||
d71df90e PM |
130 | static char convert_kthread_status(unsigned int kthread_status) |
131 | { | |
132 | if (kthread_status > RCU_KTHREAD_MAX) | |
133 | return '?'; | |
15ba0ba8 | 134 | return "SRWOY"[kthread_status]; |
d71df90e PM |
135 | } |
136 | ||
a46e0899 PM |
137 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
138 | ||
64db4cff PM |
139 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
140 | { | |
141 | if (!rdp->beenonline) | |
142 | return; | |
42c3533e | 143 | seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d", |
64db4cff PM |
144 | rdp->cpu, |
145 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
42c3533e | 146 | ulong2long(rdp->completed), ulong2long(rdp->gpnum), |
d7d6a11e | 147 | rdp->passed_quiesce, rdp->qs_pending); |
9b2e4f18 | 148 | seq_printf(m, " dt=%d/%llx/%d df=%lu", |
23b5c8fa | 149 | atomic_read(&rdp->dynticks->dynticks), |
64db4cff | 150 | rdp->dynticks->dynticks_nesting, |
23b5c8fa | 151 | rdp->dynticks->dynticks_nmi_nesting, |
64db4cff | 152 | rdp->dynticks_fqs); |
2036d94a | 153 | seq_printf(m, " of=%lu", rdp->offline_fqs); |
486e2593 PM |
154 | seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c", |
155 | rdp->qlen_lazy, rdp->qlen, | |
0ac3d136 PM |
156 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
157 | rdp->nxttail[RCU_NEXT_TAIL]], | |
158 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
159 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
160 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
161 | rdp->nxttail[RCU_WAIT_TAIL]], | |
a46e0899 PM |
162 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
163 | #ifdef CONFIG_RCU_BOOST | |
62ab7072 | 164 | seq_printf(m, " kt=%d/%c ktl=%x", |
d71df90e PM |
165 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
166 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
167 | rdp->cpu)), | |
a46e0899 PM |
168 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); |
169 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
170 | seq_printf(m, " b=%ld", rdp->blimit); | |
269dcc1c PM |
171 | seq_printf(m, " ci=%lu co=%lu ca=%lu\n", |
172 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
64db4cff PM |
173 | } |
174 | ||
c011c41f | 175 | static int show_rcudata(struct seq_file *m, void *v) |
878eda72 MW |
176 | { |
177 | print_one_rcu_data(m, (struct rcu_data *)v); | |
178 | return 0; | |
179 | } | |
180 | ||
c011c41f | 181 | static const struct seq_operations rcudate_op = { |
878eda72 MW |
182 | .start = r_start, |
183 | .next = r_next, | |
184 | .stop = r_stop, | |
c011c41f | 185 | .show = show_rcudata, |
878eda72 MW |
186 | }; |
187 | ||
c011c41f | 188 | static int rcudata_open(struct inode *inode, struct file *file) |
878eda72 | 189 | { |
c011c41f | 190 | return r_open(inode, file, &rcudate_op); |
878eda72 MW |
191 | } |
192 | ||
c011c41f | 193 | static const struct file_operations rcudata_fops = { |
878eda72 | 194 | .owner = THIS_MODULE, |
c011c41f | 195 | .open = rcudata_open, |
878eda72 MW |
196 | .read = seq_read, |
197 | .llseek = no_llseek, | |
198 | .release = seq_release, | |
199 | }; | |
200 | ||
0ea1f2eb PM |
201 | #ifdef CONFIG_RCU_BOOST |
202 | ||
203 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) | |
204 | { | |
5cf05ad7 | 205 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ", |
0ea1f2eb PM |
206 | rnp->grplo, rnp->grphi, |
207 | "T."[list_empty(&rnp->blkd_tasks)], | |
208 | "N."[!rnp->gp_tasks], | |
209 | "E."[!rnp->exp_tasks], | |
210 | "B."[!rnp->boost_tasks], | |
d71df90e | 211 | convert_kthread_status(rnp->boost_kthread_status), |
0ea1f2eb | 212 | rnp->n_tasks_boosted, rnp->n_exp_boosts, |
5cf05ad7 PM |
213 | rnp->n_normal_boosts); |
214 | seq_printf(m, "j=%04x bt=%04x\n", | |
0ea1f2eb PM |
215 | (int)(jiffies & 0xffff), |
216 | (int)(rnp->boost_time & 0xffff)); | |
5cf05ad7 | 217 | seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", |
0ea1f2eb PM |
218 | rnp->n_balk_blkd_tasks, |
219 | rnp->n_balk_exp_gp_tasks, | |
220 | rnp->n_balk_boost_tasks, | |
221 | rnp->n_balk_notblocked, | |
222 | rnp->n_balk_notyet, | |
223 | rnp->n_balk_nos); | |
224 | } | |
225 | ||
226 | static int show_rcu_node_boost(struct seq_file *m, void *unused) | |
227 | { | |
228 | struct rcu_node *rnp; | |
229 | ||
230 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) | |
231 | print_one_rcu_node_boost(m, rnp); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int rcu_node_boost_open(struct inode *inode, struct file *file) | |
236 | { | |
237 | return single_open(file, show_rcu_node_boost, NULL); | |
238 | } | |
239 | ||
240 | static const struct file_operations rcu_node_boost_fops = { | |
241 | .owner = THIS_MODULE, | |
242 | .open = rcu_node_boost_open, | |
243 | .read = seq_read, | |
29c67764 | 244 | .llseek = no_llseek, |
0ea1f2eb PM |
245 | .release = single_release, |
246 | }; | |
247 | ||
248 | /* | |
249 | * Create the rcuboost debugfs entry. Standard error return. | |
250 | */ | |
251 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
252 | { | |
253 | return !debugfs_create_file("rcuboost", 0444, rcudir, NULL, | |
254 | &rcu_node_boost_fops); | |
255 | } | |
256 | ||
257 | #else /* #ifdef CONFIG_RCU_BOOST */ | |
258 | ||
259 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
260 | { | |
261 | return 0; /* There cannot be an error if we didn't create it! */ | |
262 | } | |
263 | ||
264 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ | |
265 | ||
64db4cff PM |
266 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
267 | { | |
20133cfc | 268 | unsigned long gpnum; |
64db4cff PM |
269 | int level = 0; |
270 | struct rcu_node *rnp; | |
271 | ||
3397e040 | 272 | gpnum = rsp->gpnum; |
42c3533e PM |
273 | seq_printf(m, "%s: c=%ld g=%ld s=%d jfq=%ld j=%x ", |
274 | rsp->name, ulong2long(rsp->completed), ulong2long(gpnum), | |
275 | rsp->fqs_state, | |
64db4cff | 276 | (long)(rsp->jiffies_force_qs - jiffies), |
5cf05ad7 PM |
277 | (int)(jiffies & 0xffff)); |
278 | seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n", | |
64db4cff PM |
279 | rsp->n_force_qs, rsp->n_force_qs_ngp, |
280 | rsp->n_force_qs - rsp->n_force_qs_ngp, | |
b1420f1c | 281 | rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen); |
f885b7f2 | 282 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) { |
64db4cff PM |
283 | if (rnp->level != level) { |
284 | seq_puts(m, "\n"); | |
285 | level = rnp->level; | |
286 | } | |
12f5f524 | 287 | seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ", |
64db4cff | 288 | rnp->qsmask, rnp->qsmaskinit, |
12f5f524 PM |
289 | ".G"[rnp->gp_tasks != NULL], |
290 | ".E"[rnp->exp_tasks != NULL], | |
291 | ".T"[!list_empty(&rnp->blkd_tasks)], | |
64db4cff PM |
292 | rnp->grplo, rnp->grphi, rnp->grpnum); |
293 | } | |
294 | seq_puts(m, "\n"); | |
295 | } | |
296 | ||
297 | static int show_rcuhier(struct seq_file *m, void *unused) | |
298 | { | |
c0cc962d PM |
299 | struct rcu_state *rsp; |
300 | ||
301 | for_each_rcu_flavor(rsp) | |
302 | print_one_rcu_state(m, rsp); | |
64db4cff PM |
303 | return 0; |
304 | } | |
305 | ||
306 | static int rcuhier_open(struct inode *inode, struct file *file) | |
307 | { | |
308 | return single_open(file, show_rcuhier, NULL); | |
309 | } | |
310 | ||
9b2619af | 311 | static const struct file_operations rcuhier_fops = { |
64db4cff PM |
312 | .owner = THIS_MODULE, |
313 | .open = rcuhier_open, | |
314 | .read = seq_read, | |
315 | .llseek = seq_lseek, | |
316 | .release = single_release, | |
317 | }; | |
318 | ||
15ba0ba8 PM |
319 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) |
320 | { | |
321 | unsigned long flags; | |
322 | unsigned long completed; | |
323 | unsigned long gpnum; | |
324 | unsigned long gpage; | |
325 | unsigned long gpmax; | |
326 | struct rcu_node *rnp = &rsp->node[0]; | |
327 | ||
328 | raw_spin_lock_irqsave(&rnp->lock, flags); | |
42c3533e PM |
329 | completed = ACCESS_ONCE(rsp->completed); |
330 | gpnum = ACCESS_ONCE(rsp->gpnum); | |
331 | if (completed == gpnum) | |
15ba0ba8 PM |
332 | gpage = 0; |
333 | else | |
334 | gpage = jiffies - rsp->gp_start; | |
335 | gpmax = rsp->gp_max; | |
336 | raw_spin_unlock_irqrestore(&rnp->lock, flags); | |
42c3533e PM |
337 | seq_printf(m, "%s: completed=%ld gpnum=%ld age=%ld max=%ld\n", |
338 | rsp->name, ulong2long(completed), ulong2long(gpnum), gpage, gpmax); | |
15ba0ba8 PM |
339 | } |
340 | ||
64db4cff PM |
341 | static int show_rcugp(struct seq_file *m, void *unused) |
342 | { | |
c0cc962d PM |
343 | struct rcu_state *rsp; |
344 | ||
345 | for_each_rcu_flavor(rsp) | |
346 | show_one_rcugp(m, rsp); | |
64db4cff PM |
347 | return 0; |
348 | } | |
349 | ||
350 | static int rcugp_open(struct inode *inode, struct file *file) | |
351 | { | |
352 | return single_open(file, show_rcugp, NULL); | |
353 | } | |
354 | ||
9b2619af | 355 | static const struct file_operations rcugp_fops = { |
64db4cff PM |
356 | .owner = THIS_MODULE, |
357 | .open = rcugp_open, | |
358 | .read = seq_read, | |
359 | .llseek = seq_lseek, | |
360 | .release = single_release, | |
361 | }; | |
362 | ||
7ba5c840 PM |
363 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
364 | { | |
51d0f16d MW |
365 | if (!rdp->beenonline) |
366 | return; | |
5cf05ad7 | 367 | seq_printf(m, "%3d%cnp=%ld ", |
7ba5c840 PM |
368 | rdp->cpu, |
369 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
5cf05ad7 PM |
370 | rdp->n_rcu_pending); |
371 | seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ", | |
7ba5c840 | 372 | rdp->n_rp_qs_pending, |
d21670ac | 373 | rdp->n_rp_report_qs, |
7ba5c840 | 374 | rdp->n_rp_cb_ready, |
5cf05ad7 | 375 | rdp->n_rp_cpu_needs_gp); |
4605c014 | 376 | seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n", |
7ba5c840 PM |
377 | rdp->n_rp_gp_completed, |
378 | rdp->n_rp_gp_started, | |
7ba5c840 PM |
379 | rdp->n_rp_need_nothing); |
380 | } | |
381 | ||
c011c41f | 382 | static int show_rcu_pending(struct seq_file *m, void *v) |
51d0f16d MW |
383 | { |
384 | print_one_rcu_pending(m, (struct rcu_data *)v); | |
385 | return 0; | |
386 | } | |
387 | ||
c011c41f | 388 | static const struct seq_operations rcu_pending_op = { |
51d0f16d MW |
389 | .start = r_start, |
390 | .next = r_next, | |
391 | .stop = r_stop, | |
c011c41f | 392 | .show = show_rcu_pending, |
51d0f16d MW |
393 | }; |
394 | ||
c011c41f | 395 | static int rcu_pending_open(struct inode *inode, struct file *file) |
51d0f16d | 396 | { |
c011c41f | 397 | return r_open(inode, file, &rcu_pending_op); |
51d0f16d MW |
398 | } |
399 | ||
c011c41f | 400 | static const struct file_operations rcu_pending_fops = { |
51d0f16d | 401 | .owner = THIS_MODULE, |
c011c41f | 402 | .open = rcu_pending_open, |
51d0f16d MW |
403 | .read = seq_read, |
404 | .llseek = no_llseek, | |
405 | .release = seq_release, | |
406 | }; | |
407 | ||
4a298656 PM |
408 | static int show_rcutorture(struct seq_file *m, void *unused) |
409 | { | |
410 | seq_printf(m, "rcutorture test sequence: %lu %s\n", | |
411 | rcutorture_testseq >> 1, | |
412 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); | |
413 | seq_printf(m, "rcutorture update version number: %lu\n", | |
414 | rcutorture_vernum); | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static int rcutorture_open(struct inode *inode, struct file *file) | |
419 | { | |
420 | return single_open(file, show_rcutorture, NULL); | |
421 | } | |
422 | ||
423 | static const struct file_operations rcutorture_fops = { | |
424 | .owner = THIS_MODULE, | |
425 | .open = rcutorture_open, | |
426 | .read = seq_read, | |
427 | .llseek = seq_lseek, | |
428 | .release = single_release, | |
429 | }; | |
430 | ||
7ba5c840 | 431 | static struct dentry *rcudir; |
7ba5c840 | 432 | |
deb7a418 | 433 | static int __init rcutree_trace_init(void) |
64db4cff | 434 | { |
573bcd40 | 435 | struct rcu_state *rsp; |
22f00b69 | 436 | struct dentry *retval; |
573bcd40 | 437 | struct dentry *rspdir; |
22f00b69 | 438 | |
64db4cff PM |
439 | rcudir = debugfs_create_dir("rcu", NULL); |
440 | if (!rcudir) | |
22f00b69 | 441 | goto free_out; |
64db4cff | 442 | |
573bcd40 MW |
443 | for_each_rcu_flavor(rsp) { |
444 | rspdir = debugfs_create_dir(rsp->name, rcudir); | |
445 | if (!rspdir) | |
446 | goto free_out; | |
878eda72 MW |
447 | |
448 | retval = debugfs_create_file("rcudata", 0444, | |
c011c41f | 449 | rspdir, rsp, &rcudata_fops); |
878eda72 MW |
450 | if (!retval) |
451 | goto free_out; | |
51d0f16d MW |
452 | |
453 | retval = debugfs_create_file("rcu_pending", 0444, | |
c011c41f | 454 | rspdir, rsp, &rcu_pending_fops); |
51d0f16d MW |
455 | if (!retval) |
456 | goto free_out; | |
c25e557f MW |
457 | |
458 | retval = debugfs_create_file("rcubarrier", 0444, | |
459 | rspdir, rsp, &new_rcubarrier_fops); | |
460 | if (!retval) | |
461 | goto free_out; | |
29c67764 MW |
462 | |
463 | #ifdef CONFIG_RCU_BOOST | |
464 | if (rsp == &rcu_preempt_state) { | |
465 | retval = debugfs_create_file("rcuboost", 0444, | |
466 | rspdir, NULL, &rcu_node_boost_fops); | |
467 | if (!retval) | |
468 | goto free_out; | |
469 | } | |
470 | #endif | |
573bcd40 MW |
471 | } |
472 | ||
d7e187c8 PM |
473 | retval = debugfs_create_file("rcubarrier", 0444, rcudir, |
474 | NULL, &rcubarrier_fops); | |
475 | if (!retval) | |
476 | goto free_out; | |
477 | ||
0ea1f2eb PM |
478 | if (rcu_boost_trace_create_file(rcudir)) |
479 | goto free_out; | |
480 | ||
22f00b69 PM |
481 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
482 | if (!retval) | |
64db4cff PM |
483 | goto free_out; |
484 | ||
22f00b69 | 485 | retval = debugfs_create_file("rcuhier", 0444, rcudir, |
64db4cff | 486 | NULL, &rcuhier_fops); |
22f00b69 | 487 | if (!retval) |
64db4cff | 488 | goto free_out; |
7ba5c840 | 489 | |
4a298656 PM |
490 | retval = debugfs_create_file("rcutorture", 0444, rcudir, |
491 | NULL, &rcutorture_fops); | |
492 | if (!retval) | |
493 | goto free_out; | |
64db4cff PM |
494 | return 0; |
495 | free_out: | |
22f00b69 | 496 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
497 | return 1; |
498 | } | |
499 | ||
deb7a418 | 500 | static void __exit rcutree_trace_cleanup(void) |
64db4cff | 501 | { |
22f00b69 | 502 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
503 | } |
504 | ||
505 | ||
deb7a418 PM |
506 | module_init(rcutree_trace_init); |
507 | module_exit(rcutree_trace_cleanup); | |
64db4cff PM |
508 | |
509 | MODULE_AUTHOR("Paul E. McKenney"); | |
510 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); | |
511 | MODULE_LICENSE("GPL"); |