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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/mm/vmstat.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  linux/mm/vmstat.c
34  *
....@@ -75,7 +76,7 @@
7576 static DEFINE_MUTEX(vm_numa_stat_lock);
7677 
7778 int sysctl_vm_numa_stat_handler(struct ctl_table *table, int write,
78
-		void __user *buffer, size_t *length, loff_t *ppos)
79
+		void *buffer, size_t *length, loff_t *ppos)
7980 {
8081 	int ret, oldval;
8182 
....@@ -227,7 +228,7 @@
227228 	 * 125		1024		10	16-32 GB	9
228229 	 */
229230 
230
-	mem = zone->managed_pages >> (27 - PAGE_SHIFT);
231
+	mem = zone_managed_pages(zone) >> (27 - PAGE_SHIFT);
231232 
232233 	threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));
233234 
....@@ -320,17 +321,15 @@
320321 	long x;
321322 	long t;
322323 
323
-	preempt_disable_rt();
324324 	x = delta + __this_cpu_read(*p);
325325 
326326 	t = __this_cpu_read(pcp->stat_threshold);
327327 
328
-	if (unlikely(x > t || x < -t)) {
328
+	if (unlikely(abs(x) > t)) {
329329 		zone_page_state_add(x, zone, item);
330330 		x = 0;
331331 	}
332332 	__this_cpu_write(*p, x);
333
-	preempt_enable_rt();
334333 }
335334 EXPORT_SYMBOL(__mod_zone_page_state);
336335 
....@@ -342,17 +341,20 @@
342341 	long x;
343342 	long t;
344343 
345
-	preempt_disable_rt();
344
+	if (vmstat_item_in_bytes(item)) {
345
+		VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
346
+		delta >>= PAGE_SHIFT;
347
+	}
348
+
346349 	x = delta + __this_cpu_read(*p);
347350 
348351 	t = __this_cpu_read(pcp->stat_threshold);
349352 
350
-	if (unlikely(x > t || x < -t)) {
353
+	if (unlikely(abs(x) > t)) {
351354 		node_page_state_add(x, pgdat, item);
352355 		x = 0;
353356 	}
354357 	__this_cpu_write(*p, x);
355
-	preempt_enable_rt();
356358 }
357359 EXPORT_SYMBOL(__mod_node_page_state);
358360 
....@@ -385,7 +387,6 @@
385387 	s8 __percpu *p = pcp->vm_stat_diff + item;
386388 	s8 v, t;
387389 
388
-	preempt_disable_rt();
389390 	v = __this_cpu_inc_return(*p);
390391 	t = __this_cpu_read(pcp->stat_threshold);
391392 	if (unlikely(v > t)) {
....@@ -394,7 +395,6 @@
394395 		zone_page_state_add(v + overstep, zone, item);
395396 		__this_cpu_write(*p, -overstep);
396397 	}
397
-	preempt_enable_rt();
398398 }
399399 
400400 void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
....@@ -403,7 +403,8 @@
403403 	s8 __percpu *p = pcp->vm_node_stat_diff + item;
404404 	s8 v, t;
405405 
406
-	preempt_disable_rt();
406
+	VM_WARN_ON_ONCE(vmstat_item_in_bytes(item));
407
+
407408 	v = __this_cpu_inc_return(*p);
408409 	t = __this_cpu_read(pcp->stat_threshold);
409410 	if (unlikely(v > t)) {
....@@ -412,7 +413,6 @@
412413 		node_page_state_add(v + overstep, pgdat, item);
413414 		__this_cpu_write(*p, -overstep);
414415 	}
415
-	preempt_enable_rt();
416416 }
417417 
418418 void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
....@@ -433,7 +433,6 @@
433433 	s8 __percpu *p = pcp->vm_stat_diff + item;
434434 	s8 v, t;
435435 
436
-	preempt_disable_rt();
437436 	v = __this_cpu_dec_return(*p);
438437 	t = __this_cpu_read(pcp->stat_threshold);
439438 	if (unlikely(v < - t)) {
....@@ -442,7 +441,6 @@
442441 		zone_page_state_add(v - overstep, zone, item);
443442 		__this_cpu_write(*p, overstep);
444443 	}
445
-	preempt_enable_rt();
446444 }
447445 
448446 void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
....@@ -451,7 +449,8 @@
451449 	s8 __percpu *p = pcp->vm_node_stat_diff + item;
452450 	s8 v, t;
453451 
454
-	preempt_disable_rt();
452
+	VM_WARN_ON_ONCE(vmstat_item_in_bytes(item));
453
+
455454 	v = __this_cpu_dec_return(*p);
456455 	t = __this_cpu_read(pcp->stat_threshold);
457456 	if (unlikely(v < - t)) {
....@@ -460,7 +459,6 @@
460459 		node_page_state_add(v - overstep, pgdat, item);
461460 		__this_cpu_write(*p, overstep);
462461 	}
463
-	preempt_enable_rt();
464462 }
465463 
466464 void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
....@@ -513,7 +511,7 @@
513511 		o = this_cpu_read(*p);
514512 		n = delta + o;
515513 
516
-		if (n > t || n < -t) {
514
+		if (abs(n) > t) {
517515 			int os = overstep_mode * (t >> 1) ;
518516 
519517 			/* Overflow must be added to zone counters */
....@@ -552,6 +550,11 @@
552550 	s8 __percpu *p = pcp->vm_node_stat_diff + item;
553551 	long o, n, t, z;
554552 
553
+	if (vmstat_item_in_bytes(item)) {
554
+		VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
555
+		delta >>= PAGE_SHIFT;
556
+	}
557
+
555558 	do {
556559 		z = 0;  /* overflow to node counters */
557560 
....@@ -570,7 +573,7 @@
570573 		o = this_cpu_read(*p);
571574 		n = delta + o;
572575 
573
-		if (n > t || n < -t) {
576
+		if (abs(n) > t) {
574577 			int os = overstep_mode * (t >> 1) ;
575578 
576579 			/* Overflow must be added to node counters */
....@@ -1000,8 +1003,8 @@
10001003 /*
10011004  * Determine the per node value of a stat item.
10021005  */
1003
-unsigned long node_page_state(struct pglist_data *pgdat,
1004
-				enum node_stat_item item)
1006
+unsigned long node_page_state_pages(struct pglist_data *pgdat,
1007
+				    enum node_stat_item item)
10051008 {
10061009 	long x = atomic_long_read(&pgdat->vm_stat[item]);
10071010 #ifdef CONFIG_SMP
....@@ -1009,6 +1012,14 @@
10091012 		x = 0;
10101013 #endif
10111014 	return x;
1015
+}
1016
+
1017
+unsigned long node_page_state(struct pglist_data *pgdat,
1018
+			      enum node_stat_item item)
1019
+{
1020
+	VM_WARN_ON_ONCE(vmstat_item_in_bytes(item));
1021
+
1022
+	return node_page_state_pages(pgdat, item);
10121023 }
10131024 #endif
10141025 
....@@ -1085,6 +1096,24 @@
10851096 	return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total);
10861097 }
10871098 
1099
+/*
1100
+ * Calculates external fragmentation within a zone wrt the given order.
1101
+ * It is defined as the percentage of pages found in blocks of size
1102
+ * less than 1 << order. It returns values in range [0, 100].
1103
+ */
1104
+unsigned int extfrag_for_order(struct zone *zone, unsigned int order)
1105
+{
1106
+	struct contig_page_info info;
1107
+
1108
+	fill_contig_page_info(zone, order, &info);
1109
+	if (info.free_pages == 0)
1110
+		return 0;
1111
+
1112
+	return div_u64((info.free_pages -
1113
+			(info.free_blocks_suitable << order)) * 100,
1114
+			info.free_pages);
1115
+}
1116
+
10881117 /* Same as __fragmentation index but allocs contig_page_info on stack */
10891118 int fragmentation_index(struct zone *zone, unsigned int order)
10901119 {
....@@ -1095,7 +1124,8 @@
10951124 }
10961125 #endif
10971126 
1098
-#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA)
1127
+#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || \
1128
+    defined(CONFIG_NUMA) || defined(CONFIG_MEMCG)
10991129 #ifdef CONFIG_ZONE_DMA
11001130 #define TEXT_FOR_DMA(xx) xx "_dma",
11011131 #else
....@@ -1118,7 +1148,7 @@
11181148 					TEXT_FOR_HIGHMEM(xx) xx "_movable",
11191149 
11201150 const char * const vmstat_text[] = {
1121
-	/* enum zone_stat_item countes */
1151
+	/* enum zone_stat_item counters */
11221152 	"nr_free_pages",
11231153 	"nr_zone_inactive_anon",
11241154 	"nr_zone_active_anon",
....@@ -1128,14 +1158,8 @@
11281158 	"nr_zone_write_pending",
11291159 	"nr_mlock",
11301160 	"nr_page_table_pages",
1131
-	"nr_kernel_stack",
1132
-#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
1133
-	"nr_shadow_call_stack_bytes",
1134
-#endif
11351161 	"nr_bounce",
1136
-#if IS_ENABLED(CONFIG_ZSMALLOC)
11371162 	"nr_zspages",
1138
-#endif
11391163 	"nr_free_cma",
11401164 
11411165 	/* enum numa_stat_item counters */
....@@ -1148,7 +1172,7 @@
11481172 	"numa_other",
11491173 #endif
11501174 
1151
-	/* Node-based counters */
1175
+	/* enum node_stat_item counters */
11521176 	"nr_inactive_anon",
11531177 	"nr_active_anon",
11541178 	"nr_inactive_file",
....@@ -1158,9 +1182,13 @@
11581182 	"nr_slab_unreclaimable",
11591183 	"nr_isolated_anon",
11601184 	"nr_isolated_file",
1161
-	"workingset_refault",
1162
-	"workingset_activate",
1163
-	"workingset_restore",
1185
+	"workingset_nodes",
1186
+	"workingset_refault_anon",
1187
+	"workingset_refault_file",
1188
+	"workingset_activate_anon",
1189
+	"workingset_activate_file",
1190
+	"workingset_restore_anon",
1191
+	"workingset_restore_file",
11641192 	"workingset_nodereclaim",
11651193 	"nr_anon_pages",
11661194 	"nr_mapped",
....@@ -1171,28 +1199,29 @@
11711199 	"nr_shmem",
11721200 	"nr_shmem_hugepages",
11731201 	"nr_shmem_pmdmapped",
1202
+	"nr_file_hugepages",
1203
+	"nr_file_pmdmapped",
11741204 	"nr_anon_transparent_hugepages",
1175
-	"nr_unstable",
11761205 	"nr_vmscan_write",
11771206 	"nr_vmscan_immediate_reclaim",
11781207 	"nr_dirtied",
11791208 	"nr_written",
11801209 	"nr_kernel_misc_reclaimable",
1181
-	"nr_unreclaimable_pages",
1210
+	"nr_foll_pin_acquired",
1211
+	"nr_foll_pin_released",
1212
+	"nr_kernel_stack",
1213
+#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
1214
+	"nr_shadow_call_stack",
1215
+#endif
11821216 
1183
-
1184
-	"nr_ion_heap",
1185
-	"nr_ion_heap_pool",
1186
-	"nr_gpu_heap",
11871217 	/* enum writeback_stat_item counters */
11881218 	"nr_dirty_threshold",
11891219 	"nr_dirty_background_threshold",
11901220 
1191
-#ifdef CONFIG_VM_EVENT_COUNTERS
1221
+#if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG)
11921222 	/* enum vm_event_item counters */
11931223 	"pgpgin",
11941224 	"pgpgout",
1195
-	"pgpgoutclean",
11961225 	"pswpin",
11971226 	"pswpout",
11981227 
....@@ -1210,11 +1239,16 @@
12101239 	"pglazyfreed",
12111240 
12121241 	"pgrefill",
1242
+	"pgreuse",
12131243 	"pgsteal_kswapd",
12141244 	"pgsteal_direct",
12151245 	"pgscan_kswapd",
12161246 	"pgscan_direct",
12171247 	"pgscan_direct_throttle",
1248
+	"pgscan_anon",
1249
+	"pgscan_file",
1250
+	"pgsteal_anon",
1251
+	"pgsteal_file",
12181252 
12191253 #ifdef CONFIG_NUMA
12201254 	"zone_reclaim_failed",
....@@ -1242,6 +1276,9 @@
12421276 #ifdef CONFIG_MIGRATION
12431277 	"pgmigrate_success",
12441278 	"pgmigrate_fail",
1279
+	"thp_migration_success",
1280
+	"thp_migration_fail",
1281
+	"thp_migration_split",
12451282 #endif
12461283 #ifdef CONFIG_COMPACTION
12471284 	"compact_migrate_scanned",
....@@ -1259,6 +1296,10 @@
12591296 	"htlb_buddy_alloc_success",
12601297 	"htlb_buddy_alloc_fail",
12611298 #endif
1299
+#ifdef CONFIG_CMA
1300
+	"cma_alloc_success",
1301
+	"cma_alloc_fail",
1302
+#endif
12621303 	"unevictable_pgs_culled",
12631304 	"unevictable_pgs_scanned",
12641305 	"unevictable_pgs_rescued",
....@@ -1270,9 +1311,12 @@
12701311 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
12711312 	"thp_fault_alloc",
12721313 	"thp_fault_fallback",
1314
+	"thp_fault_fallback_charge",
12731315 	"thp_collapse_alloc",
12741316 	"thp_collapse_alloc_failed",
12751317 	"thp_file_alloc",
1318
+	"thp_file_fallback",
1319
+	"thp_file_fallback_charge",
12761320 	"thp_file_mapped",
12771321 	"thp_split_page",
12781322 	"thp_split_page_failed",
....@@ -1308,9 +1352,13 @@
13081352 	"swap_ra",
13091353 	"swap_ra_hit",
13101354 #endif
1311
-#endif /* CONFIG_VM_EVENTS_COUNTERS */
1355
+#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
1356
+	"speculative_pgfault",
1357
+	"speculative_pgfault_file"
1358
+#endif
1359
+#endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */
13121360 };
1313
-#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */
1361
+#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA || CONFIG_MEMCG */
13141362 
13151363 #if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)) || \
13161364      defined(CONFIG_PROC_FS)
....@@ -1400,12 +1448,26 @@
14001448 			unsigned long freecount = 0;
14011449 			struct free_area *area;
14021450 			struct list_head *curr;
1451
+			bool overflow = false;
14031452 
14041453 			area = &(zone->free_area[order]);
14051454 
1406
-			list_for_each(curr, &area->free_list[mtype])
1407
-				freecount++;
1408
-			seq_printf(m, "%6lu ", freecount);
1455
+			list_for_each(curr, &area->free_list[mtype]) {
1456
+				/*
1457
+				 * Cap the free_list iteration because it might
1458
+				 * be really large and we are under a spinlock
1459
+				 * so a long time spent here could trigger a
1460
+				 * hard lockup detector. Anyway this is a
1461
+				 * debugging tool so knowing there is a handful
1462
+				 * of pages of this order should be more than
1463
+				 * sufficient.
1464
+				 */
1465
+				if (++freecount >= 100000) {
1466
+					overflow = true;
1467
+					break;
1468
+				}
1469
+			}
1470
+			seq_printf(m, "%s%6lu ", overflow ? ">" : "", freecount);
14091471 			spin_unlock_irq(&zone->lock);
14101472 			cond_resched();
14111473 			spin_lock_irq(&zone->lock);
....@@ -1445,10 +1507,6 @@
14451507 
14461508 		page = pfn_to_online_page(pfn);
14471509 		if (!page)
1448
-			continue;
1449
-
1450
-		/* Watch for unexpected holes punched in the memmap */
1451
-		if (!memmap_valid_within(pfn, page, zone))
14521510 			continue;
14531511 
14541512 		if (page_zone(page) != zone)
....@@ -1567,14 +1625,8 @@
15671625 	if (is_zone_first_populated(pgdat, zone)) {
15681626 		seq_printf(m, "\n  per-node stats");
15691627 		for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
1570
-			/* Skip hidden vmstat items. */
1571
-			if (*vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
1572
-					 NR_VM_NUMA_STAT_ITEMS] == '\0')
1573
-				continue;
1574
-			seq_printf(m, "\n      %-12s %lu",
1575
-				vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
1576
-				NR_VM_NUMA_STAT_ITEMS],
1577
-				node_page_state(pgdat, i));
1628
+			seq_printf(m, "\n      %-12s %lu", node_stat_name(i),
1629
+				   node_page_state_pages(pgdat, i));
15781630 		}
15791631 	}
15801632 	seq_printf(m,
....@@ -1584,14 +1636,16 @@
15841636 		   "\n        high     %lu"
15851637 		   "\n        spanned  %lu"
15861638 		   "\n        present  %lu"
1587
-		   "\n        managed  %lu",
1639
+		   "\n        managed  %lu"
1640
+		   "\n        cma      %lu",
15881641 		   zone_page_state(zone, NR_FREE_PAGES),
15891642 		   min_wmark_pages(zone),
15901643 		   low_wmark_pages(zone),
15911644 		   high_wmark_pages(zone),
15921645 		   zone->spanned_pages,
15931646 		   zone->present_pages,
1594
-		   zone->managed_pages);
1647
+		   zone_managed_pages(zone),
1648
+		   zone_cma_pages(zone));
15951649 
15961650 	seq_printf(m,
15971651 		   "\n        protection: (%ld",
....@@ -1607,14 +1661,13 @@
16071661 	}
16081662 
16091663 	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
1610
-		seq_printf(m, "\n      %-12s %lu", vmstat_text[i],
1611
-				zone_page_state(zone, i));
1664
+		seq_printf(m, "\n      %-12s %lu", zone_stat_name(i),
1665
+			   zone_page_state(zone, i));
16121666 
16131667 #ifdef CONFIG_NUMA
16141668 	for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
1615
-		seq_printf(m, "\n      %-12s %lu",
1616
-				vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
1617
-				zone_numa_state_snapshot(zone, i));
1669
+		seq_printf(m, "\n      %-12s %lu", numa_stat_name(i),
1670
+			   zone_numa_state_snapshot(zone, i));
16181671 #endif
16191672 
16201673 	seq_printf(m, "\n  pagesets");
....@@ -1665,29 +1718,23 @@
16651718 	.show	= zoneinfo_show,
16661719 };
16671720 
1668
-enum writeback_stat_item {
1669
-	NR_DIRTY_THRESHOLD,
1670
-	NR_DIRTY_BG_THRESHOLD,
1671
-	NR_VM_WRITEBACK_STAT_ITEMS,
1672
-};
1721
+#define NR_VMSTAT_ITEMS (NR_VM_ZONE_STAT_ITEMS + \
1722
+			 NR_VM_NUMA_STAT_ITEMS + \
1723
+			 NR_VM_NODE_STAT_ITEMS + \
1724
+			 NR_VM_WRITEBACK_STAT_ITEMS + \
1725
+			 (IS_ENABLED(CONFIG_VM_EVENT_COUNTERS) ? \
1726
+			  NR_VM_EVENT_ITEMS : 0))
16731727 
16741728 static void *vmstat_start(struct seq_file *m, loff_t *pos)
16751729 {
16761730 	unsigned long *v;
1677
-	int i, stat_items_size;
1731
+	int i;
16781732 
1679
-	if (*pos >= ARRAY_SIZE(vmstat_text))
1733
+	if (*pos >= NR_VMSTAT_ITEMS)
16801734 		return NULL;
1681
-	stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) +
1682
-			  NR_VM_NUMA_STAT_ITEMS * sizeof(unsigned long) +
1683
-			  NR_VM_NODE_STAT_ITEMS * sizeof(unsigned long) +
1684
-			  NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long);
16851735 
1686
-#ifdef CONFIG_VM_EVENT_COUNTERS
1687
-	stat_items_size += sizeof(struct vm_event_state);
1688
-#endif
1689
-
1690
-	v = kmalloc(stat_items_size, GFP_KERNEL);
1736
+	BUILD_BUG_ON(ARRAY_SIZE(vmstat_text) < NR_VMSTAT_ITEMS);
1737
+	v = kmalloc_array(NR_VMSTAT_ITEMS, sizeof(unsigned long), GFP_KERNEL);
16911738 	m->private = v;
16921739 	if (!v)
16931740 		return ERR_PTR(-ENOMEM);
....@@ -1702,7 +1749,7 @@
17021749 #endif
17031750 
17041751 	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
1705
-		v[i] = global_node_page_state(i);
1752
+		v[i] = global_node_page_state_pages(i);
17061753 	v += NR_VM_NODE_STAT_ITEMS;
17071754 
17081755 	global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD,
....@@ -1720,10 +1767,7 @@
17201767 static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
17211768 {
17221769 	(*pos)++;
1723
-	//nr_gpu_heap is out-of-tree now so we don't want to export it.
1724
-	if (*pos == NR_VM_ZONE_STAT_ITEMS + NR_VM_NUMA_STAT_ITEMS + NR_GPU_HEAP)
1725
-		(*pos)++;
1726
-	if (*pos >= ARRAY_SIZE(vmstat_text))
1770
+	if (*pos >= NR_VMSTAT_ITEMS)
17271771 		return NULL;
17281772 	return (unsigned long *)m->private + *pos;
17291773 }
....@@ -1736,6 +1780,14 @@
17361780 	seq_puts(m, vmstat_text[off]);
17371781 	seq_put_decimal_ull(m, " ", *l);
17381782 	seq_putc(m, '\n');
1783
+
1784
+	if (off == NR_VMSTAT_ITEMS - 1) {
1785
+		/*
1786
+		 * We've come to the end - add any deprecated counters to avoid
1787
+		 * breaking userspace which might depend on them being present.
1788
+		 */
1789
+		seq_puts(m, "nr_unstable 0\n");
1790
+	}
17391791 	return 0;
17401792 }
17411793 
....@@ -1764,7 +1816,7 @@
17641816 }
17651817 
17661818 int vmstat_refresh(struct ctl_table *table, int write,
1767
-		   void __user *buffer, size_t *lenp, loff_t *ppos)
1819
+		   void *buffer, size_t *lenp, loff_t *ppos)
17681820 {
17691821 	long val;
17701822 	int err;
....@@ -1789,7 +1841,7 @@
17891841 		val = atomic_long_read(&vm_zone_stat[i]);
17901842 		if (val < 0) {
17911843 			pr_warn("%s: %s %ld\n",
1792
-				__func__, vmstat_text[i], val);
1844
+				__func__, zone_stat_name(i), val);
17931845 			err = -EINVAL;
17941846 		}
17951847 	}
....@@ -1798,7 +1850,7 @@
17981850 		val = atomic_long_read(&vm_numa_stat[i]);
17991851 		if (val < 0) {
18001852 			pr_warn("%s: %s %ld\n",
1801
-				__func__, vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], val);
1853
+				__func__, numa_stat_name(i), val);
18021854 			err = -EINVAL;
18031855 		}
18041856 	}
....@@ -2068,24 +2120,14 @@
20682120 	return 0;
20692121 }
20702122 
2071
-static const struct seq_operations unusable_op = {
2123
+static const struct seq_operations unusable_sops = {
20722124 	.start	= frag_start,
20732125 	.next	= frag_next,
20742126 	.stop	= frag_stop,
20752127 	.show	= unusable_show,
20762128 };
20772129 
2078
-static int unusable_open(struct inode *inode, struct file *file)
2079
-{
2080
-	return seq_open(file, &unusable_op);
2081
-}
2082
-
2083
-static const struct file_operations unusable_file_ops = {
2084
-	.open		= unusable_open,
2085
-	.read		= seq_read,
2086
-	.llseek		= seq_lseek,
2087
-	.release	= seq_release,
2088
-};
2130
+DEFINE_SEQ_ATTRIBUTE(unusable);
20892131 
20902132 static void extfrag_show_print(struct seq_file *m,
20912133 					pg_data_t *pgdat, struct zone *zone)
....@@ -2120,45 +2162,28 @@
21202162 	return 0;
21212163 }
21222164 
2123
-static const struct seq_operations extfrag_op = {
2165
+static const struct seq_operations extfrag_sops = {
21242166 	.start	= frag_start,
21252167 	.next	= frag_next,
21262168 	.stop	= frag_stop,
21272169 	.show	= extfrag_show,
21282170 };
21292171 
2130
-static int extfrag_open(struct inode *inode, struct file *file)
2131
-{
2132
-	return seq_open(file, &extfrag_op);
2133
-}
2134
-
2135
-static const struct file_operations extfrag_file_ops = {
2136
-	.open		= extfrag_open,
2137
-	.read		= seq_read,
2138
-	.llseek		= seq_lseek,
2139
-	.release	= seq_release,
2140
-};
2172
+DEFINE_SEQ_ATTRIBUTE(extfrag);
21412173 
21422174 static int __init extfrag_debug_init(void)
21432175 {
21442176 	struct dentry *extfrag_debug_root;
21452177 
21462178 	extfrag_debug_root = debugfs_create_dir("extfrag", NULL);
2147
-	if (!extfrag_debug_root)
2148
-		return -ENOMEM;
21492179 
2150
-	if (!debugfs_create_file("unusable_index", 0444,
2151
-			extfrag_debug_root, NULL, &unusable_file_ops))
2152
-		goto fail;
2180
+	debugfs_create_file("unusable_index", 0444, extfrag_debug_root, NULL,
2181
+			    &unusable_fops);
21532182 
2154
-	if (!debugfs_create_file("extfrag_index", 0444,
2155
-			extfrag_debug_root, NULL, &extfrag_file_ops))
2156
-		goto fail;
2183
+	debugfs_create_file("extfrag_index", 0444, extfrag_debug_root, NULL,
2184
+			    &extfrag_fops);
21572185 
21582186 	return 0;
2159
-fail:
2160
-	debugfs_remove_recursive(extfrag_debug_root);
2161
-	return -ENOMEM;
21622187 }
21632188 
21642189 module_init(extfrag_debug_init);