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2521f2c2 PO |
1 | /* |
2 | * This code exports profiling data as debugfs files to userspace. | |
3 | * | |
4 | * Copyright IBM Corp. 2009 | |
5 | * Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com> | |
6 | * | |
7 | * Uses gcc-internal data definitions. | |
8 | * Based on the gcov-kernel patch by: | |
9 | * Hubertus Franke <frankeh@us.ibm.com> | |
10 | * Nigel Hinds <nhinds@us.ibm.com> | |
11 | * Rajan Ravindran <rajancr@us.ibm.com> | |
12 | * Peter Oberparleiter <oberpar@linux.vnet.ibm.com> | |
13 | * Paul Larson | |
14 | * Yi CDL Yang | |
15 | */ | |
16 | ||
17 | #define pr_fmt(fmt) "gcov: " fmt | |
18 | ||
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/debugfs.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include "gcov.h" | |
29 | ||
30 | /** | |
31 | * struct gcov_node - represents a debugfs entry | |
32 | * @list: list head for child node list | |
33 | * @children: child nodes | |
34 | * @all: list head for list of all nodes | |
35 | * @parent: parent node | |
36 | * @info: associated profiling data structure if not a directory | |
37 | * @ghost: when an object file containing profiling data is unloaded we keep a | |
38 | * copy of the profiling data here to allow collecting coverage data | |
39 | * for cleanup code. Such a node is called a "ghost". | |
40 | * @dentry: main debugfs entry, either a directory or data file | |
41 | * @links: associated symbolic links | |
42 | * @name: data file basename | |
43 | * | |
44 | * struct gcov_node represents an entity within the gcov/ subdirectory | |
45 | * of debugfs. There are directory and data file nodes. The latter represent | |
46 | * the actual synthesized data file plus any associated symbolic links which | |
47 | * are needed by the gcov tool to work correctly. | |
48 | */ | |
49 | struct gcov_node { | |
50 | struct list_head list; | |
51 | struct list_head children; | |
52 | struct list_head all; | |
53 | struct gcov_node *parent; | |
54 | struct gcov_info *info; | |
55 | struct gcov_info *ghost; | |
56 | struct dentry *dentry; | |
57 | struct dentry **links; | |
58 | char name[0]; | |
59 | }; | |
60 | ||
61 | static const char objtree[] = OBJTREE; | |
62 | static const char srctree[] = SRCTREE; | |
63 | static struct gcov_node root_node; | |
64 | static struct dentry *reset_dentry; | |
65 | static LIST_HEAD(all_head); | |
66 | static DEFINE_MUTEX(node_lock); | |
67 | ||
68 | /* If non-zero, keep copies of profiling data for unloaded modules. */ | |
69 | static int gcov_persist = 1; | |
70 | ||
71 | static int __init gcov_persist_setup(char *str) | |
72 | { | |
73 | unsigned long val; | |
74 | ||
75 | if (strict_strtoul(str, 0, &val)) { | |
76 | pr_warning("invalid gcov_persist parameter '%s'\n", str); | |
77 | return 0; | |
78 | } | |
79 | gcov_persist = val; | |
80 | pr_info("setting gcov_persist to %d\n", gcov_persist); | |
81 | ||
82 | return 1; | |
83 | } | |
84 | __setup("gcov_persist=", gcov_persist_setup); | |
85 | ||
86 | /* | |
87 | * seq_file.start() implementation for gcov data files. Note that the | |
88 | * gcov_iterator interface is designed to be more restrictive than seq_file | |
89 | * (no start from arbitrary position, etc.), to simplify the iterator | |
90 | * implementation. | |
91 | */ | |
92 | static void *gcov_seq_start(struct seq_file *seq, loff_t *pos) | |
93 | { | |
94 | loff_t i; | |
95 | ||
96 | gcov_iter_start(seq->private); | |
97 | for (i = 0; i < *pos; i++) { | |
98 | if (gcov_iter_next(seq->private)) | |
99 | return NULL; | |
100 | } | |
101 | return seq->private; | |
102 | } | |
103 | ||
104 | /* seq_file.next() implementation for gcov data files. */ | |
105 | static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos) | |
106 | { | |
107 | struct gcov_iterator *iter = data; | |
108 | ||
109 | if (gcov_iter_next(iter)) | |
110 | return NULL; | |
111 | (*pos)++; | |
112 | ||
113 | return iter; | |
114 | } | |
115 | ||
116 | /* seq_file.show() implementation for gcov data files. */ | |
117 | static int gcov_seq_show(struct seq_file *seq, void *data) | |
118 | { | |
119 | struct gcov_iterator *iter = data; | |
120 | ||
121 | if (gcov_iter_write(iter, seq)) | |
122 | return -EINVAL; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static void gcov_seq_stop(struct seq_file *seq, void *data) | |
127 | { | |
128 | /* Unused. */ | |
129 | } | |
130 | ||
131 | static const struct seq_operations gcov_seq_ops = { | |
132 | .start = gcov_seq_start, | |
133 | .next = gcov_seq_next, | |
134 | .show = gcov_seq_show, | |
135 | .stop = gcov_seq_stop, | |
136 | }; | |
137 | ||
138 | /* | |
139 | * Return the profiling data set for a given node. This can either be the | |
140 | * original profiling data structure or a duplicate (also called "ghost") | |
141 | * in case the associated object file has been unloaded. | |
142 | */ | |
143 | static struct gcov_info *get_node_info(struct gcov_node *node) | |
144 | { | |
145 | if (node->info) | |
146 | return node->info; | |
147 | ||
148 | return node->ghost; | |
149 | } | |
150 | ||
151 | /* | |
152 | * open() implementation for gcov data files. Create a copy of the profiling | |
153 | * data set and initialize the iterator and seq_file interface. | |
154 | */ | |
155 | static int gcov_seq_open(struct inode *inode, struct file *file) | |
156 | { | |
157 | struct gcov_node *node = inode->i_private; | |
158 | struct gcov_iterator *iter; | |
159 | struct seq_file *seq; | |
160 | struct gcov_info *info; | |
161 | int rc = -ENOMEM; | |
162 | ||
163 | mutex_lock(&node_lock); | |
164 | /* | |
165 | * Read from a profiling data copy to minimize reference tracking | |
166 | * complexity and concurrent access. | |
167 | */ | |
168 | info = gcov_info_dup(get_node_info(node)); | |
169 | if (!info) | |
170 | goto out_unlock; | |
171 | iter = gcov_iter_new(info); | |
172 | if (!iter) | |
173 | goto err_free_info; | |
174 | rc = seq_open(file, &gcov_seq_ops); | |
175 | if (rc) | |
176 | goto err_free_iter_info; | |
177 | seq = file->private_data; | |
178 | seq->private = iter; | |
179 | out_unlock: | |
180 | mutex_unlock(&node_lock); | |
181 | return rc; | |
182 | ||
183 | err_free_iter_info: | |
184 | gcov_iter_free(iter); | |
185 | err_free_info: | |
186 | gcov_info_free(info); | |
187 | goto out_unlock; | |
188 | } | |
189 | ||
190 | /* | |
191 | * release() implementation for gcov data files. Release resources allocated | |
192 | * by open(). | |
193 | */ | |
194 | static int gcov_seq_release(struct inode *inode, struct file *file) | |
195 | { | |
196 | struct gcov_iterator *iter; | |
197 | struct gcov_info *info; | |
198 | struct seq_file *seq; | |
199 | ||
200 | seq = file->private_data; | |
201 | iter = seq->private; | |
202 | info = gcov_iter_get_info(iter); | |
203 | gcov_iter_free(iter); | |
204 | gcov_info_free(info); | |
205 | seq_release(inode, file); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Find a node by the associated data file name. Needs to be called with | |
212 | * node_lock held. | |
213 | */ | |
214 | static struct gcov_node *get_node_by_name(const char *name) | |
215 | { | |
216 | struct gcov_node *node; | |
217 | struct gcov_info *info; | |
218 | ||
219 | list_for_each_entry(node, &all_head, all) { | |
220 | info = get_node_info(node); | |
221 | if (info && (strcmp(info->filename, name) == 0)) | |
222 | return node; | |
223 | } | |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
228 | static void remove_node(struct gcov_node *node); | |
229 | ||
230 | /* | |
231 | * write() implementation for gcov data files. Reset profiling data for the | |
232 | * associated file. If the object file has been unloaded (i.e. this is | |
233 | * a "ghost" node), remove the debug fs node as well. | |
234 | */ | |
235 | static ssize_t gcov_seq_write(struct file *file, const char __user *addr, | |
236 | size_t len, loff_t *pos) | |
237 | { | |
238 | struct seq_file *seq; | |
239 | struct gcov_info *info; | |
240 | struct gcov_node *node; | |
241 | ||
242 | seq = file->private_data; | |
243 | info = gcov_iter_get_info(seq->private); | |
244 | mutex_lock(&node_lock); | |
245 | node = get_node_by_name(info->filename); | |
246 | if (node) { | |
247 | /* Reset counts or remove node for unloaded modules. */ | |
248 | if (node->ghost) | |
249 | remove_node(node); | |
250 | else | |
251 | gcov_info_reset(node->info); | |
252 | } | |
253 | /* Reset counts for open file. */ | |
254 | gcov_info_reset(info); | |
255 | mutex_unlock(&node_lock); | |
256 | ||
257 | return len; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Given a string <path> representing a file path of format: | |
262 | * path/to/file.gcda | |
263 | * construct and return a new string: | |
264 | * <dir/>path/to/file.<ext> | |
265 | */ | |
266 | static char *link_target(const char *dir, const char *path, const char *ext) | |
267 | { | |
268 | char *target; | |
269 | char *old_ext; | |
270 | char *copy; | |
271 | ||
272 | copy = kstrdup(path, GFP_KERNEL); | |
273 | if (!copy) | |
274 | return NULL; | |
275 | old_ext = strrchr(copy, '.'); | |
276 | if (old_ext) | |
277 | *old_ext = '\0'; | |
278 | if (dir) | |
279 | target = kasprintf(GFP_KERNEL, "%s/%s.%s", dir, copy, ext); | |
280 | else | |
281 | target = kasprintf(GFP_KERNEL, "%s.%s", copy, ext); | |
282 | kfree(copy); | |
283 | ||
284 | return target; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Construct a string representing the symbolic link target for the given | |
289 | * gcov data file name and link type. Depending on the link type and the | |
290 | * location of the data file, the link target can either point to a | |
291 | * subdirectory of srctree, objtree or in an external location. | |
292 | */ | |
293 | static char *get_link_target(const char *filename, const struct gcov_link *ext) | |
294 | { | |
295 | const char *rel; | |
296 | char *result; | |
297 | ||
298 | if (strncmp(filename, objtree, strlen(objtree)) == 0) { | |
299 | rel = filename + strlen(objtree) + 1; | |
300 | if (ext->dir == SRC_TREE) | |
301 | result = link_target(srctree, rel, ext->ext); | |
302 | else | |
303 | result = link_target(objtree, rel, ext->ext); | |
304 | } else { | |
305 | /* External compilation. */ | |
306 | result = link_target(NULL, filename, ext->ext); | |
307 | } | |
308 | ||
309 | return result; | |
310 | } | |
311 | ||
312 | #define SKEW_PREFIX ".tmp_" | |
313 | ||
314 | /* | |
315 | * For a filename .tmp_filename.ext return filename.ext. Needed to compensate | |
316 | * for filename skewing caused by the mod-versioning mechanism. | |
317 | */ | |
318 | static const char *deskew(const char *basename) | |
319 | { | |
320 | if (strncmp(basename, SKEW_PREFIX, sizeof(SKEW_PREFIX) - 1) == 0) | |
321 | return basename + sizeof(SKEW_PREFIX) - 1; | |
322 | return basename; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Create links to additional files (usually .c and .gcno files) which the | |
327 | * gcov tool expects to find in the same directory as the gcov data file. | |
328 | */ | |
329 | static void add_links(struct gcov_node *node, struct dentry *parent) | |
330 | { | |
331 | char *basename; | |
332 | char *target; | |
333 | int num; | |
334 | int i; | |
335 | ||
336 | for (num = 0; gcov_link[num].ext; num++) | |
337 | /* Nothing. */; | |
338 | node->links = kcalloc(num, sizeof(struct dentry *), GFP_KERNEL); | |
339 | if (!node->links) | |
340 | return; | |
341 | for (i = 0; i < num; i++) { | |
342 | target = get_link_target(get_node_info(node)->filename, | |
343 | &gcov_link[i]); | |
344 | if (!target) | |
345 | goto out_err; | |
346 | basename = strrchr(target, '/'); | |
347 | if (!basename) | |
348 | goto out_err; | |
349 | basename++; | |
350 | node->links[i] = debugfs_create_symlink(deskew(basename), | |
351 | parent, target); | |
352 | if (!node->links[i]) | |
353 | goto out_err; | |
354 | kfree(target); | |
355 | } | |
356 | ||
357 | return; | |
358 | out_err: | |
359 | kfree(target); | |
360 | while (i-- > 0) | |
361 | debugfs_remove(node->links[i]); | |
362 | kfree(node->links); | |
363 | node->links = NULL; | |
364 | } | |
365 | ||
366 | static const struct file_operations gcov_data_fops = { | |
367 | .open = gcov_seq_open, | |
368 | .release = gcov_seq_release, | |
369 | .read = seq_read, | |
370 | .llseek = seq_lseek, | |
371 | .write = gcov_seq_write, | |
372 | }; | |
373 | ||
374 | /* Basic initialization of a new node. */ | |
375 | static void init_node(struct gcov_node *node, struct gcov_info *info, | |
376 | const char *name, struct gcov_node *parent) | |
377 | { | |
378 | INIT_LIST_HEAD(&node->list); | |
379 | INIT_LIST_HEAD(&node->children); | |
380 | INIT_LIST_HEAD(&node->all); | |
381 | node->info = info; | |
382 | node->parent = parent; | |
383 | if (name) | |
384 | strcpy(node->name, name); | |
385 | } | |
386 | ||
387 | /* | |
388 | * Create a new node and associated debugfs entry. Needs to be called with | |
389 | * node_lock held. | |
390 | */ | |
391 | static struct gcov_node *new_node(struct gcov_node *parent, | |
392 | struct gcov_info *info, const char *name) | |
393 | { | |
394 | struct gcov_node *node; | |
395 | ||
396 | node = kzalloc(sizeof(struct gcov_node) + strlen(name) + 1, GFP_KERNEL); | |
397 | if (!node) { | |
398 | pr_warning("out of memory\n"); | |
399 | return NULL; | |
400 | } | |
401 | init_node(node, info, name, parent); | |
402 | /* Differentiate between gcov data file nodes and directory nodes. */ | |
403 | if (info) { | |
404 | node->dentry = debugfs_create_file(deskew(node->name), 0600, | |
405 | parent->dentry, node, &gcov_data_fops); | |
406 | } else | |
407 | node->dentry = debugfs_create_dir(node->name, parent->dentry); | |
408 | if (!node->dentry) { | |
409 | pr_warning("could not create file\n"); | |
410 | kfree(node); | |
411 | return NULL; | |
412 | } | |
413 | if (info) | |
414 | add_links(node, parent->dentry); | |
415 | list_add(&node->list, &parent->children); | |
416 | list_add(&node->all, &all_head); | |
417 | ||
418 | return node; | |
419 | } | |
420 | ||
421 | /* Remove symbolic links associated with node. */ | |
422 | static void remove_links(struct gcov_node *node) | |
423 | { | |
424 | int i; | |
425 | ||
426 | if (!node->links) | |
427 | return; | |
428 | for (i = 0; gcov_link[i].ext; i++) | |
429 | debugfs_remove(node->links[i]); | |
430 | kfree(node->links); | |
431 | node->links = NULL; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Remove node from all lists and debugfs and release associated resources. | |
436 | * Needs to be called with node_lock held. | |
437 | */ | |
438 | static void release_node(struct gcov_node *node) | |
439 | { | |
440 | list_del(&node->list); | |
441 | list_del(&node->all); | |
442 | debugfs_remove(node->dentry); | |
443 | remove_links(node); | |
444 | if (node->ghost) | |
445 | gcov_info_free(node->ghost); | |
446 | kfree(node); | |
447 | } | |
448 | ||
449 | /* Release node and empty parents. Needs to be called with node_lock held. */ | |
450 | static void remove_node(struct gcov_node *node) | |
451 | { | |
452 | struct gcov_node *parent; | |
453 | ||
454 | while ((node != &root_node) && list_empty(&node->children)) { | |
455 | parent = node->parent; | |
456 | release_node(node); | |
457 | node = parent; | |
458 | } | |
459 | } | |
460 | ||
461 | /* | |
462 | * Find child node with given basename. Needs to be called with node_lock | |
463 | * held. | |
464 | */ | |
465 | static struct gcov_node *get_child_by_name(struct gcov_node *parent, | |
466 | const char *name) | |
467 | { | |
468 | struct gcov_node *node; | |
469 | ||
470 | list_for_each_entry(node, &parent->children, list) { | |
471 | if (strcmp(node->name, name) == 0) | |
472 | return node; | |
473 | } | |
474 | ||
475 | return NULL; | |
476 | } | |
477 | ||
478 | /* | |
479 | * write() implementation for reset file. Reset all profiling data to zero | |
480 | * and remove ghost nodes. | |
481 | */ | |
482 | static ssize_t reset_write(struct file *file, const char __user *addr, | |
483 | size_t len, loff_t *pos) | |
484 | { | |
485 | struct gcov_node *node; | |
486 | ||
487 | mutex_lock(&node_lock); | |
488 | restart: | |
489 | list_for_each_entry(node, &all_head, all) { | |
490 | if (node->info) | |
491 | gcov_info_reset(node->info); | |
492 | else if (list_empty(&node->children)) { | |
493 | remove_node(node); | |
494 | /* Several nodes may have gone - restart loop. */ | |
495 | goto restart; | |
496 | } | |
497 | } | |
498 | mutex_unlock(&node_lock); | |
499 | ||
500 | return len; | |
501 | } | |
502 | ||
503 | /* read() implementation for reset file. Unused. */ | |
504 | static ssize_t reset_read(struct file *file, char __user *addr, size_t len, | |
505 | loff_t *pos) | |
506 | { | |
507 | /* Allow read operation so that a recursive copy won't fail. */ | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static const struct file_operations gcov_reset_fops = { | |
512 | .write = reset_write, | |
513 | .read = reset_read, | |
514 | }; | |
515 | ||
516 | /* | |
517 | * Create a node for a given profiling data set and add it to all lists and | |
518 | * debugfs. Needs to be called with node_lock held. | |
519 | */ | |
520 | static void add_node(struct gcov_info *info) | |
521 | { | |
522 | char *filename; | |
523 | char *curr; | |
524 | char *next; | |
525 | struct gcov_node *parent; | |
526 | struct gcov_node *node; | |
527 | ||
528 | filename = kstrdup(info->filename, GFP_KERNEL); | |
529 | if (!filename) | |
530 | return; | |
531 | parent = &root_node; | |
532 | /* Create directory nodes along the path. */ | |
533 | for (curr = filename; (next = strchr(curr, '/')); curr = next + 1) { | |
534 | if (curr == next) | |
535 | continue; | |
536 | *next = 0; | |
537 | if (strcmp(curr, ".") == 0) | |
538 | continue; | |
539 | if (strcmp(curr, "..") == 0) { | |
540 | if (!parent->parent) | |
541 | goto err_remove; | |
542 | parent = parent->parent; | |
543 | continue; | |
544 | } | |
545 | node = get_child_by_name(parent, curr); | |
546 | if (!node) { | |
547 | node = new_node(parent, NULL, curr); | |
548 | if (!node) | |
549 | goto err_remove; | |
550 | } | |
551 | parent = node; | |
552 | } | |
553 | /* Create file node. */ | |
554 | node = new_node(parent, info, curr); | |
555 | if (!node) | |
556 | goto err_remove; | |
557 | out: | |
558 | kfree(filename); | |
559 | return; | |
560 | ||
561 | err_remove: | |
562 | remove_node(parent); | |
563 | goto out; | |
564 | } | |
565 | ||
566 | /* | |
567 | * The profiling data set associated with this node is being unloaded. Store a | |
568 | * copy of the profiling data and turn this node into a "ghost". | |
569 | */ | |
570 | static int ghost_node(struct gcov_node *node) | |
571 | { | |
572 | node->ghost = gcov_info_dup(node->info); | |
573 | if (!node->ghost) { | |
574 | pr_warning("could not save data for '%s' (out of memory)\n", | |
575 | node->info->filename); | |
576 | return -ENOMEM; | |
577 | } | |
578 | node->info = NULL; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | /* | |
584 | * Profiling data for this node has been loaded again. Add profiling data | |
585 | * from previous instantiation and turn this node into a regular node. | |
586 | */ | |
587 | static void revive_node(struct gcov_node *node, struct gcov_info *info) | |
588 | { | |
589 | if (gcov_info_is_compatible(node->ghost, info)) | |
590 | gcov_info_add(info, node->ghost); | |
591 | else { | |
592 | pr_warning("discarding saved data for '%s' (version changed)\n", | |
593 | info->filename); | |
594 | } | |
595 | gcov_info_free(node->ghost); | |
596 | node->ghost = NULL; | |
597 | node->info = info; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Callback to create/remove profiling files when code compiled with | |
602 | * -fprofile-arcs is loaded/unloaded. | |
603 | */ | |
604 | void gcov_event(enum gcov_action action, struct gcov_info *info) | |
605 | { | |
606 | struct gcov_node *node; | |
607 | ||
608 | mutex_lock(&node_lock); | |
609 | node = get_node_by_name(info->filename); | |
610 | switch (action) { | |
611 | case GCOV_ADD: | |
612 | /* Add new node or revive ghost. */ | |
613 | if (!node) { | |
614 | add_node(info); | |
615 | break; | |
616 | } | |
617 | if (gcov_persist) | |
618 | revive_node(node, info); | |
619 | else { | |
620 | pr_warning("could not add '%s' (already exists)\n", | |
621 | info->filename); | |
622 | } | |
623 | break; | |
624 | case GCOV_REMOVE: | |
625 | /* Remove node or turn into ghost. */ | |
626 | if (!node) { | |
627 | pr_warning("could not remove '%s' (not found)\n", | |
628 | info->filename); | |
629 | break; | |
630 | } | |
631 | if (gcov_persist) { | |
632 | if (!ghost_node(node)) | |
633 | break; | |
634 | } | |
635 | remove_node(node); | |
636 | break; | |
637 | } | |
638 | mutex_unlock(&node_lock); | |
639 | } | |
640 | ||
641 | /* Create debugfs entries. */ | |
642 | static __init int gcov_fs_init(void) | |
643 | { | |
644 | int rc = -EIO; | |
645 | ||
646 | init_node(&root_node, NULL, NULL, NULL); | |
647 | /* | |
648 | * /sys/kernel/debug/gcov will be parent for the reset control file | |
649 | * and all profiling files. | |
650 | */ | |
651 | root_node.dentry = debugfs_create_dir("gcov", NULL); | |
652 | if (!root_node.dentry) | |
653 | goto err_remove; | |
654 | /* | |
655 | * Create reset file which resets all profiling counts when written | |
656 | * to. | |
657 | */ | |
658 | reset_dentry = debugfs_create_file("reset", 0600, root_node.dentry, | |
659 | NULL, &gcov_reset_fops); | |
660 | if (!reset_dentry) | |
661 | goto err_remove; | |
662 | /* Replay previous events to get our fs hierarchy up-to-date. */ | |
663 | gcov_enable_events(); | |
664 | return 0; | |
665 | ||
666 | err_remove: | |
667 | pr_err("init failed\n"); | |
668 | if (root_node.dentry) | |
669 | debugfs_remove(root_node.dentry); | |
670 | ||
671 | return rc; | |
672 | } | |
673 | device_initcall(gcov_fs_init); |