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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/mm/page_owner.c
....@@ -3,13 +3,14 @@
33 #include <linux/mm.h>
44 #include <linux/slab.h>
55 #include <linux/uaccess.h>
6
-#include <linux/bootmem.h>
6
+#include <linux/memblock.h>
77 #include <linux/stacktrace.h>
88 #include <linux/page_owner.h>
99 #include <linux/jump_label.h>
1010 #include <linux/migrate.h>
1111 #include <linux/stackdepot.h>
1212 #include <linux/seq_file.h>
13
+#include <linux/sched/clock.h>
1314 
1415 #include "internal.h"
1516 
....@@ -24,10 +25,15 @@
2425 	short last_migrate_reason;
2526 	gfp_t gfp_mask;
2627 	depot_stack_handle_t handle;
28
+	depot_stack_handle_t free_handle;
29
+	u64 ts_nsec;
30
+	u64 free_ts_nsec;
31
+	pid_t pid;
2732 };
2833 
29
-static bool page_owner_disabled = true;
34
+bool page_owner_enabled;
3035 DEFINE_STATIC_KEY_FALSE(page_owner_inited);
36
+EXPORT_SYMBOL_GPL(page_owner_inited);
3137 
3238 static depot_stack_handle_t dummy_handle;
3339 static depot_stack_handle_t failure_handle;
....@@ -41,7 +47,7 @@
4147 		return -EINVAL;
4248 
4349 	if (strcmp(buf, "on") == 0)
44
-		page_owner_disabled = false;
50
+		page_owner_enabled = true;
4551 
4652 	return 0;
4753 }
....@@ -49,24 +55,16 @@
4955 
5056 static bool need_page_owner(void)
5157 {
52
-	if (page_owner_disabled)
53
-		return false;
54
-
55
-	return true;
58
+	return page_owner_enabled;
5659 }
5760 
5861 static __always_inline depot_stack_handle_t create_dummy_stack(void)
5962 {
6063 	unsigned long entries[4];
61
-	struct stack_trace dummy;
64
+	unsigned int nr_entries;
6265 
63
-	dummy.nr_entries = 0;
64
-	dummy.max_entries = ARRAY_SIZE(entries);
65
-	dummy.entries = &entries[0];
66
-	dummy.skip = 0;
67
-
68
-	save_stack_trace(&dummy);
69
-	return depot_save_stack(&dummy, GFP_KERNEL);
66
+	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
67
+	return stack_depot_save(entries, nr_entries, GFP_KERNEL);
7068 }
7169 
7270 static noinline void register_dummy_stack(void)
....@@ -86,7 +84,7 @@
8684 
8785 static void init_page_owner(void)
8886 {
89
-	if (page_owner_disabled)
87
+	if (!page_owner_enabled)
9088 		return;
9189 
9290 	register_dummy_stack();
....@@ -102,103 +100,134 @@
102100 	.init = init_page_owner,
103101 };
104102 
105
-static inline struct page_owner *get_page_owner(struct page_ext *page_ext)
103
+struct page_owner *get_page_owner(struct page_ext *page_ext)
106104 {
107105 	return (void *)page_ext + page_owner_ops.offset;
108106 }
107
+EXPORT_SYMBOL_GPL(get_page_owner);
109108 
110
-void __reset_page_owner(struct page *page, unsigned int order)
109
+depot_stack_handle_t get_page_owner_handle(struct page_ext *page_ext, unsigned long pfn)
111110 {
112
-	int i;
113
-	struct page_ext *page_ext;
111
+	struct page_owner *page_owner;
112
+	depot_stack_handle_t handle;
114113 
115
-	for (i = 0; i < (1 << order); i++) {
116
-		page_ext = lookup_page_ext(page + i);
117
-		if (unlikely(!page_ext))
118
-			continue;
119
-		__clear_bit(PAGE_EXT_OWNER, &page_ext->flags);
120
-	}
114
+	if (!page_owner_enabled)
115
+		return 0;
116
+
117
+	page_owner = get_page_owner(page_ext);
118
+
119
+	/* skip handle for tail pages of higher order allocations */
120
+	if (!IS_ALIGNED(pfn, 1 << page_owner->order))
121
+		return 0;
122
+
123
+	handle = READ_ONCE(page_owner->handle);
124
+	return handle;
121125 }
126
+EXPORT_SYMBOL_GPL(get_page_owner_handle);
122127 
123
-static inline bool check_recursive_alloc(struct stack_trace *trace,
124
-					unsigned long ip)
128
+static inline bool check_recursive_alloc(unsigned long *entries,
129
+					 unsigned int nr_entries,
130
+					 unsigned long ip)
125131 {
126
-	int i;
132
+	unsigned int i;
127133 
128
-	if (!trace->nr_entries)
129
-		return false;
130
-
131
-	for (i = 0; i < trace->nr_entries; i++) {
132
-		if (trace->entries[i] == ip)
134
+	for (i = 0; i < nr_entries; i++) {
135
+		if (entries[i] == ip)
133136 			return true;
134137 	}
135
-
136138 	return false;
137139 }
138140 
139141 static noinline depot_stack_handle_t save_stack(gfp_t flags)
140142 {
141143 	unsigned long entries[PAGE_OWNER_STACK_DEPTH];
142
-	struct stack_trace trace = {
143
-		.nr_entries = 0,
144
-		.entries = entries,
145
-		.max_entries = PAGE_OWNER_STACK_DEPTH,
146
-		.skip = 2
147
-	};
148144 	depot_stack_handle_t handle;
145
+	unsigned int nr_entries;
149146 
150
-	save_stack_trace(&trace);
151
-	if (trace.nr_entries != 0 &&
152
-	    trace.entries[trace.nr_entries-1] == ULONG_MAX)
153
-		trace.nr_entries--;
147
+	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 2);
154148 
155149 	/*
156
-	 * We need to check recursion here because our request to stackdepot
157
-	 * could trigger memory allocation to save new entry. New memory
158
-	 * allocation would reach here and call depot_save_stack() again
159
-	 * if we don't catch it. There is still not enough memory in stackdepot
160
-	 * so it would try to allocate memory again and loop forever.
150
+	 * We need to check recursion here because our request to
151
+	 * stackdepot could trigger memory allocation to save new
152
+	 * entry. New memory allocation would reach here and call
153
+	 * stack_depot_save_entries() again if we don't catch it. There is
154
+	 * still not enough memory in stackdepot so it would try to
155
+	 * allocate memory again and loop forever.
161156 	 */
162
-	if (check_recursive_alloc(&trace, _RET_IP_))
157
+	if (check_recursive_alloc(entries, nr_entries, _RET_IP_))
163158 		return dummy_handle;
164159 
165
-	handle = depot_save_stack(&trace, flags);
160
+	handle = stack_depot_save(entries, nr_entries, flags);
166161 	if (!handle)
167162 		handle = failure_handle;
168163 
169164 	return handle;
170165 }
171166 
172
-static inline void __set_page_owner_handle(struct page_ext *page_ext,
173
-	depot_stack_handle_t handle, unsigned int order, gfp_t gfp_mask)
167
+void __reset_page_owner(struct page *page, unsigned int order)
168
+{
169
+	int i;
170
+	struct page_ext *page_ext;
171
+	depot_stack_handle_t handle = 0;
172
+	struct page_owner *page_owner;
173
+	u64 free_ts_nsec = local_clock();
174
+
175
+	handle = save_stack(GFP_NOWAIT | __GFP_NOWARN);
176
+
177
+	page_ext = page_ext_get(page);
178
+	if (unlikely(!page_ext))
179
+		return;
180
+	for (i = 0; i < (1 << order); i++) {
181
+		__clear_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags);
182
+		page_owner = get_page_owner(page_ext);
183
+		page_owner->free_handle = handle;
184
+		page_owner->free_ts_nsec = free_ts_nsec;
185
+		page_ext = page_ext_next(page_ext);
186
+	}
187
+	page_ext_put(page_ext);
188
+}
189
+
190
+static inline void __set_page_owner_handle(struct page *page,
191
+	struct page_ext *page_ext, depot_stack_handle_t handle,
192
+	unsigned int order, gfp_t gfp_mask)
174193 {
175194 	struct page_owner *page_owner;
195
+	int i;
176196 
177
-	page_owner = get_page_owner(page_ext);
178
-	page_owner->handle = handle;
179
-	page_owner->order = order;
180
-	page_owner->gfp_mask = gfp_mask;
181
-	page_owner->last_migrate_reason = -1;
197
+	for (i = 0; i < (1 << order); i++) {
198
+		page_owner = get_page_owner(page_ext);
199
+		page_owner->handle = handle;
200
+		page_owner->order = order;
201
+		page_owner->gfp_mask = gfp_mask;
202
+		page_owner->last_migrate_reason = -1;
203
+		page_owner->pid = current->pid;
204
+		page_owner->ts_nsec = local_clock();
205
+		__set_bit(PAGE_EXT_OWNER, &page_ext->flags);
206
+		__set_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags);
182207 
183
-	__set_bit(PAGE_EXT_OWNER, &page_ext->flags);
208
+		page_ext = page_ext_next(page_ext);
209
+	}
184210 }
185211 
186212 noinline void __set_page_owner(struct page *page, unsigned int order,
187213 					gfp_t gfp_mask)
188214 {
189
-	struct page_ext *page_ext = lookup_page_ext(page);
215
+	struct page_ext *page_ext;
190216 	depot_stack_handle_t handle;
191217 
218
+	handle = save_stack(gfp_mask);
219
+
220
+	page_ext = page_ext_get(page);
192221 	if (unlikely(!page_ext))
193222 		return;
194
-
195
-	handle = save_stack(gfp_mask);
196
-	__set_page_owner_handle(page_ext, handle, order, gfp_mask);
223
+	__set_page_owner_handle(page, page_ext, handle, order, gfp_mask);
224
+	page_ext_put(page_ext);
197225 }
226
+EXPORT_SYMBOL_GPL(__set_page_owner);
198227 
199228 void __set_page_owner_migrate_reason(struct page *page, int reason)
200229 {
201
-	struct page_ext *page_ext = lookup_page_ext(page);
230
+	struct page_ext *page_ext = page_ext_get(page);
202231 	struct page_owner *page_owner;
203232 
204233 	if (unlikely(!page_ext))
....@@ -206,31 +235,41 @@
206235 
207236 	page_owner = get_page_owner(page_ext);
208237 	page_owner->last_migrate_reason = reason;
238
+	page_ext_put(page_ext);
209239 }
210240 
211
-void __split_page_owner(struct page *page, unsigned int order)
241
+void __split_page_owner(struct page *page, unsigned int nr)
212242 {
213243 	int i;
214
-	struct page_ext *page_ext = lookup_page_ext(page);
244
+	struct page_ext *page_ext = page_ext_get(page);
215245 	struct page_owner *page_owner;
216246 
217247 	if (unlikely(!page_ext))
218248 		return;
219249 
220
-	page_owner = get_page_owner(page_ext);
221
-	page_owner->order = 0;
222
-	for (i = 1; i < (1 << order); i++)
223
-		__copy_page_owner(page, page + i);
250
+	for (i = 0; i < nr; i++) {
251
+		page_owner = get_page_owner(page_ext);
252
+		page_owner->order = 0;
253
+		page_ext = page_ext_next(page_ext);
254
+	}
255
+	page_ext_put(page_ext);
224256 }
225257 
226258 void __copy_page_owner(struct page *oldpage, struct page *newpage)
227259 {
228
-	struct page_ext *old_ext = lookup_page_ext(oldpage);
229
-	struct page_ext *new_ext = lookup_page_ext(newpage);
260
+	struct page_ext *old_ext;
261
+	struct page_ext *new_ext;
230262 	struct page_owner *old_page_owner, *new_page_owner;
231263 
232
-	if (unlikely(!old_ext || !new_ext))
264
+	old_ext = page_ext_get(oldpage);
265
+	if (unlikely(!old_ext))
233266 		return;
267
+
268
+	new_ext = page_ext_get(newpage);
269
+	if (unlikely(!new_ext)) {
270
+		page_ext_put(old_ext);
271
+		return;
272
+	}
234273 
235274 	old_page_owner = get_page_owner(old_ext);
236275 	new_page_owner = get_page_owner(new_ext);
....@@ -239,6 +278,9 @@
239278 	new_page_owner->last_migrate_reason =
240279 		old_page_owner->last_migrate_reason;
241280 	new_page_owner->handle = old_page_owner->handle;
281
+	new_page_owner->pid = old_page_owner->pid;
282
+	new_page_owner->ts_nsec = old_page_owner->ts_nsec;
283
+	new_page_owner->free_ts_nsec = old_page_owner->ts_nsec;
242284 
243285 	/*
244286 	 * We don't clear the bit on the oldpage as it's going to be freed
....@@ -250,6 +292,9 @@
250292 	 * the new page, which will be freed.
251293 	 */
252294 	__set_bit(PAGE_EXT_OWNER, &new_ext->flags);
295
+	__set_bit(PAGE_EXT_OWNER_ALLOCATED, &new_ext->flags);
296
+	page_ext_put(new_ext);
297
+	page_ext_put(old_ext);
253298 }
254299 
255300 void pagetypeinfo_showmixedcount_print(struct seq_file *m,
....@@ -297,7 +342,7 @@
297342 			if (PageBuddy(page)) {
298343 				unsigned long freepage_order;
299344 
300
-				freepage_order = page_order_unsafe(page);
345
+				freepage_order = buddy_order_unsafe(page);
301346 				if (freepage_order < MAX_ORDER)
302347 					pfn += (1UL << freepage_order) - 1;
303348 				continue;
....@@ -306,16 +351,15 @@
306351 			if (PageReserved(page))
307352 				continue;
308353 
309
-			page_ext = lookup_page_ext(page);
354
+			page_ext = page_ext_get(page);
310355 			if (unlikely(!page_ext))
311356 				continue;
312357 
313
-			if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
314
-				continue;
358
+			if (!test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags))
359
+				goto ext_put_continue;
315360 
316361 			page_owner = get_page_owner(page_ext);
317
-			page_mt = gfpflags_to_migratetype(
318
-					page_owner->gfp_mask);
362
+			page_mt = gfp_migratetype(page_owner->gfp_mask);
319363 			if (pageblock_mt != page_mt) {
320364 				if (is_migrate_cma(pageblock_mt))
321365 					count[MIGRATE_MOVABLE]++;
....@@ -323,9 +367,12 @@
323367 					count[pageblock_mt]++;
324368 
325369 				pfn = block_end_pfn;
370
+				page_ext_put(page_ext);
326371 				break;
327372 			}
328373 			pfn += (1UL << page_owner->order) - 1;
374
+ext_put_continue:
375
+			page_ext_put(page_ext);
329376 		}
330377 	}
331378 
....@@ -341,32 +388,28 @@
341388 		struct page *page, struct page_owner *page_owner,
342389 		depot_stack_handle_t handle)
343390 {
344
-	int ret;
345
-	int pageblock_mt, page_mt;
391
+	int ret, pageblock_mt, page_mt;
392
+	unsigned long *entries;
393
+	unsigned int nr_entries;
346394 	char *kbuf;
347
-	unsigned long entries[PAGE_OWNER_STACK_DEPTH];
348
-	struct stack_trace trace = {
349
-		.nr_entries = 0,
350
-		.entries = entries,
351
-		.max_entries = PAGE_OWNER_STACK_DEPTH,
352
-		.skip = 0
353
-	};
354395 
396
+	count = min_t(size_t, count, PAGE_SIZE);
355397 	kbuf = kmalloc(count, GFP_KERNEL);
356398 	if (!kbuf)
357399 		return -ENOMEM;
358400 
359401 	ret = snprintf(kbuf, count,
360
-			"Page allocated via order %u, mask %#x(%pGg)\n",
402
+			"Page allocated via order %u, mask %#x(%pGg), pid %d, ts %llu ns, free_ts %llu ns\n",
361403 			page_owner->order, page_owner->gfp_mask,
362
-			&page_owner->gfp_mask);
404
+			&page_owner->gfp_mask, page_owner->pid,
405
+			page_owner->ts_nsec, page_owner->free_ts_nsec);
363406 
364407 	if (ret >= count)
365408 		goto err;
366409 
367410 	/* Print information relevant to grouping pages by mobility */
368411 	pageblock_mt = get_pageblock_migratetype(page);
369
-	page_mt  = gfpflags_to_migratetype(page_owner->gfp_mask);
412
+	page_mt  = gfp_migratetype(page_owner->gfp_mask);
370413 	ret += snprintf(kbuf + ret, count - ret,
371414 			"PFN %lu type %s Block %lu type %s Flags %#lx(%pGp)\n",
372415 			pfn,
....@@ -378,8 +421,8 @@
378421 	if (ret >= count)
379422 		goto err;
380423 
381
-	depot_fetch_stack(handle, &trace);
382
-	ret += snprint_stack_trace(kbuf + ret, count - ret, &trace, 0);
424
+	nr_entries = stack_depot_fetch(handle, &entries);
425
+	ret += stack_trace_snprint(kbuf + ret, count - ret, entries, nr_entries, 0);
383426 	if (ret >= count)
384427 		goto err;
385428 
....@@ -408,16 +451,11 @@
408451 
409452 void __dump_page_owner(struct page *page)
410453 {
411
-	struct page_ext *page_ext = lookup_page_ext(page);
454
+	struct page_ext *page_ext = page_ext_get((void *)page);
412455 	struct page_owner *page_owner;
413
-	unsigned long entries[PAGE_OWNER_STACK_DEPTH];
414
-	struct stack_trace trace = {
415
-		.nr_entries = 0,
416
-		.entries = entries,
417
-		.max_entries = PAGE_OWNER_STACK_DEPTH,
418
-		.skip = 0
419
-	};
420456 	depot_stack_handle_t handle;
457
+	unsigned long *entries;
458
+	unsigned int nr_entries;
421459 	gfp_t gfp_mask;
422460 	int mt;
423461 
....@@ -428,28 +466,44 @@
428466 
429467 	page_owner = get_page_owner(page_ext);
430468 	gfp_mask = page_owner->gfp_mask;
431
-	mt = gfpflags_to_migratetype(gfp_mask);
469
+	mt = gfp_migratetype(gfp_mask);
432470 
433471 	if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) {
434
-		pr_alert("page_owner info is not active (free page?)\n");
472
+		pr_alert("page_owner info is not present (never set?)\n");
473
+		page_ext_put(page_ext);
435474 		return;
436475 	}
476
+
477
+	if (test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags))
478
+		pr_alert("page_owner tracks the page as allocated\n");
479
+	else
480
+		pr_alert("page_owner tracks the page as freed\n");
481
+
482
+	pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, ts %llu, free_ts %llu\n",
483
+		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask,
484
+		 page_owner->pid, page_owner->ts_nsec, page_owner->free_ts_nsec);
437485 
438486 	handle = READ_ONCE(page_owner->handle);
439487 	if (!handle) {
440
-		pr_alert("page_owner info is not active (free page?)\n");
441
-		return;
488
+		pr_alert("page_owner allocation stack trace missing\n");
489
+	} else {
490
+		nr_entries = stack_depot_fetch(handle, &entries);
491
+		stack_trace_print(entries, nr_entries, 0);
442492 	}
443493 
444
-	depot_fetch_stack(handle, &trace);
445
-	pr_alert("PFN 0x%lx allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",
446
-		 page_to_pfn(page),
447
-		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
448
-	print_stack_trace(&trace, 0);
494
+	handle = READ_ONCE(page_owner->free_handle);
495
+	if (!handle) {
496
+		pr_alert("page_owner free stack trace missing\n");
497
+	} else {
498
+		nr_entries = stack_depot_fetch(handle, &entries);
499
+		pr_alert("page last free stack trace:\n");
500
+		stack_trace_print(entries, nr_entries, 0);
501
+	}
449502 
450503 	if (page_owner->last_migrate_reason != -1)
451504 		pr_alert("page has been migrated, last migrate reason: %s\n",
452505 			migrate_reason_names[page_owner->last_migrate_reason]);
506
+	page_ext_put(page_ext);
453507 }
454508 
455509 static ssize_t
....@@ -476,6 +530,14 @@
476530 	/* Find an allocated page */
477531 	for (; pfn < max_pfn; pfn++) {
478532 		/*
533
+		 * This temporary page_owner is required so
534
+		 * that we can avoid the context switches while holding
535
+		 * the rcu lock and copying the page owner information to
536
+		 * user through copy_to_user() or GFP_KERNEL allocations.
537
+		 */
538
+		struct page_owner page_owner_tmp;
539
+
540
+		/*
479541 		 * If the new page is in a new MAX_ORDER_NR_PAGES area,
480542 		 * validate the area as existing, skip it if not
481543 		 */
....@@ -490,14 +552,14 @@
490552 
491553 		page = pfn_to_page(pfn);
492554 		if (PageBuddy(page)) {
493
-			unsigned long freepage_order = page_order_unsafe(page);
555
+			unsigned long freepage_order = buddy_order_unsafe(page);
494556 
495557 			if (freepage_order < MAX_ORDER)
496558 				pfn += (1UL << freepage_order) - 1;
497559 			continue;
498560 		}
499561 
500
-		page_ext = lookup_page_ext(page);
562
+		page_ext = page_ext_get(page);
501563 		if (unlikely(!page_ext))
502564 			continue;
503565 
....@@ -506,9 +568,23 @@
506568 		 * because we don't hold the zone lock.
507569 		 */
508570 		if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
509
-			continue;
571
+			goto ext_put_continue;
572
+
573
+		/*
574
+		 * Although we do have the info about past allocation of free
575
+		 * pages, it's not relevant for current memory usage.
576
+		 */
577
+		if (!test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags))
578
+			goto ext_put_continue;
510579 
511580 		page_owner = get_page_owner(page_ext);
581
+
582
+		/*
583
+		 * Don't print "tail" pages of high-order allocations as that
584
+		 * would inflate the stats.
585
+		 */
586
+		if (!IS_ALIGNED(pfn, 1 << page_owner->order))
587
+			goto ext_put_continue;
512588 
513589 		/*
514590 		 * Access to page_ext->handle isn't synchronous so we should
....@@ -516,13 +592,17 @@
516592 		 */
517593 		handle = READ_ONCE(page_owner->handle);
518594 		if (!handle)
519
-			continue;
595
+			goto ext_put_continue;
520596 
521597 		/* Record the next PFN to read in the file offset */
522598 		*ppos = (pfn - min_low_pfn) + 1;
523599 
600
+		page_owner_tmp = *page_owner;
601
+		page_ext_put(page_ext);
524602 		return print_page_owner(buf, count, pfn, page,
525
-				page_owner, handle);
603
+				&page_owner_tmp, handle);
604
+ext_put_continue:
605
+		page_ext_put(page_ext);
526606 	}
527607 
528608 	return 0;
....@@ -570,7 +650,7 @@
570650 			 * heavy lock contention.
571651 			 */
572652 			if (PageBuddy(page)) {
573
-				unsigned long order = page_order_unsafe(page);
653
+				unsigned long order = buddy_order_unsafe(page);
574654 
575655 				if (order > 0 && order < MAX_ORDER)
576656 					pfn += (1UL << order) - 1;
....@@ -580,17 +660,20 @@
580660 			if (PageReserved(page))
581661 				continue;
582662 
583
-			page_ext = lookup_page_ext(page);
663
+			page_ext = page_ext_get(page);
584664 			if (unlikely(!page_ext))
585665 				continue;
586666 
587667 			/* Maybe overlapping zone */
588668 			if (test_bit(PAGE_EXT_OWNER, &page_ext->flags))
589
-				continue;
669
+				goto ext_put_continue;
590670 
591671 			/* Found early allocated page */
592
-			__set_page_owner_handle(page_ext, early_handle, 0, 0);
672
+			__set_page_owner_handle(page, page_ext, early_handle,
673
+						0, 0);
593674 			count++;
675
+ext_put_continue:
676
+			page_ext_put(page_ext);
594677 		}
595678 		cond_resched();
596679 	}
....@@ -626,16 +709,14 @@
626709 
627710 static int __init pageowner_init(void)
628711 {
629
-	struct dentry *dentry;
630
-
631712 	if (!static_branch_unlikely(&page_owner_inited)) {
632713 		pr_info("page_owner is disabled\n");
633714 		return 0;
634715 	}
635716 
636
-	dentry = debugfs_create_file("page_owner", 0400, NULL,
637
-				     NULL, &proc_page_owner_operations);
717
+	debugfs_create_file("page_owner", 0400, NULL, NULL,
718
+			    &proc_page_owner_operations);
638719 
639
-	return PTR_ERR_OR_ZERO(dentry);
720
+	return 0;
640721 }
641722 late_initcall(pageowner_init)