Linux-libre 4.6.2-gnu

1 files changed, 385 insertions, 104 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7b387cc2a..8aaa0e57f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -224,6 +224,19 @@ static char * const zone_names[MAX_NR_ZONES] = {
 #endif
 };
 
+char * const migratetype_names[MIGRATE_TYPES] = {
+	"Unmovable",
+	"Movable",
+	"Reclaimable",
+	"HighAtomic",
+#ifdef CONFIG_CMA
+	"CMA",
+#endif
+#ifdef CONFIG_MEMORY_ISOLATION
+	"Isolate",
+#endif
+};
+
 compound_page_dtor * const compound_page_dtors[] = {
 	NULL,
 	free_compound_page,
@@ -237,6 +250,7 @@ compound_page_dtor * const compound_page_dtors[] = {
 
 int min_free_kbytes = 1024;
 int user_min_free_kbytes = -1;
+int watermark_scale_factor = 10;
 
 static unsigned long __meminitdata nr_kernel_pages;
 static unsigned long __meminitdata nr_all_pages;
@@ -248,6 +262,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
 static unsigned long __initdata required_kernelcore;
 static unsigned long __initdata required_movablecore;
 static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
+static bool mirrored_kernelcore;
 
 /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
 int movable_zone;
@@ -294,13 +309,20 @@ static inline bool update_defer_init(pg_data_t *pgdat,
 				unsigned long pfn, unsigned long zone_end,
 				unsigned long *nr_initialised)
 {
+	unsigned long max_initialise;
+
 	/* Always populate low zones for address-contrained allocations */
 	if (zone_end < pgdat_end_pfn(pgdat))
 		return true;
+	/*
+	 * Initialise at least 2G of a node but also take into account that
+	 * two large system hashes that can take up 1GB for 0.25TB/node.
+	 */
+	max_initialise = max(2UL << (30 - PAGE_SHIFT),
+		(pgdat->node_spanned_pages >> 8));
 
-	/* Initialise at least 2G of the highest zone */
 	(*nr_initialised)++;
-	if (*nr_initialised > (2UL << (30 - PAGE_SHIFT)) &&
+	if ((*nr_initialised > max_initialise) &&
 	    (pfn & (PAGES_PER_SECTION - 1)) == 0) {
 		pgdat->first_deferred_pfn = pfn;
 		return false;
@@ -417,7 +439,7 @@ static void bad_page(struct page *page, const char *reason,
 			goto out;
 		}
 		if (nr_unshown) {
-			printk(KERN_ALERT
+			pr_alert(
 			      "BUG: Bad page state: %lu messages suppressed\n",
 				nr_unshown);
 			nr_unshown = 0;
@@ -427,9 +449,14 @@ static void bad_page(struct page *page, const char *reason,
 	if (nr_shown++ == 0)
 		resume = jiffies + 60 * HZ;
 
-	printk(KERN_ALERT "BUG: Bad page state in process %s  pfn:%05lx\n",
+	pr_alert("BUG: Bad page state in process %s  pfn:%05lx\n",
 		current->comm, page_to_pfn(page));
-	dump_page_badflags(page, reason, bad_flags);
+	__dump_page(page, reason);
+	bad_flags &= page->flags;
+	if (bad_flags)
+		pr_alert("bad because of flags: %#lx(%pGp)\n",
+						bad_flags, &bad_flags);
+	dump_page_owner(page);
 
 	print_modules();
 	dump_stack();
@@ -478,7 +505,9 @@ void prep_compound_page(struct page *page, unsigned int order)
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
 unsigned int _debug_guardpage_minorder;
-bool _debug_pagealloc_enabled __read_mostly;
+bool _debug_pagealloc_enabled __read_mostly
+			= IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT);
+EXPORT_SYMBOL(_debug_pagealloc_enabled);
 bool _debug_guardpage_enabled __read_mostly;
 
 static int __init early_debug_pagealloc(char *buf)
@@ -489,6 +518,9 @@ static int __init early_debug_pagealloc(char *buf)
 	if (strcmp(buf, "on") == 0)
 		_debug_pagealloc_enabled = true;
 
+	if (strcmp(buf, "off") == 0)
+		_debug_pagealloc_enabled = false;
+
 	return 0;
 }
 early_param("debug_pagealloc", early_debug_pagealloc);
@@ -520,11 +552,11 @@ static int __init debug_guardpage_minorder_setup(char *buf)
 	unsigned long res;
 
 	if (kstrtoul(buf, 10, &res) < 0 ||  res > MAX_ORDER / 2) {
-		printk(KERN_ERR "Bad debug_guardpage_minorder value\n");
+		pr_err("Bad debug_guardpage_minorder value\n");
 		return 0;
 	}
 	_debug_guardpage_minorder = res;
-	printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res);
+	pr_info("Setting debug_guardpage_minorder to %lu\n", res);
 	return 0;
 }
 __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup);
@@ -762,7 +794,7 @@ static inline int free_pages_check(struct page *page)
 		bad_reason = "nonzero mapcount";
 	if (unlikely(page->mapping != NULL))
 		bad_reason = "non-NULL mapping";
-	if (unlikely(atomic_read(&page->_count) != 0))
+	if (unlikely(page_ref_count(page) != 0))
 		bad_reason = "nonzero _count";
 	if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) {
 		bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
@@ -978,7 +1010,7 @@ static inline void init_reserved_page(unsigned long pfn)
  * marks the pages PageReserved. The remaining valid pages are later
  * sent to the buddy page allocator.
  */
-void __meminit reserve_bootmem_region(unsigned long start, unsigned long end)
+void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end)
 {
 	unsigned long start_pfn = PFN_DOWN(start);
 	unsigned long end_pfn = PFN_UP(end);
@@ -1029,6 +1061,7 @@ static bool free_pages_prepare(struct page *page, unsigned int order)
 					   PAGE_SIZE << order);
 	}
 	arch_free_page(page, order);
+	kernel_poison_pages(page, 1 << order, 0);
 	kernel_map_pages(page, 1 << order, 0);
 
 	return true;
@@ -1131,6 +1164,75 @@ void __init __free_pages_bootmem(struct page *page, unsigned long pfn,
 	return __free_pages_boot_core(page, pfn, order);
 }
 
+/*
+ * Check that the whole (or subset of) a pageblock given by the interval of
+ * [start_pfn, end_pfn) is valid and within the same zone, before scanning it
+ * with the migration of free compaction scanner. The scanners then need to
+ * use only pfn_valid_within() check for arches that allow holes within
+ * pageblocks.
+ *
+ * Return struct page pointer of start_pfn, or NULL if checks were not passed.
+ *
+ * It's possible on some configurations to have a setup like node0 node1 node0
+ * i.e. it's possible that all pages within a zones range of pages do not
+ * belong to a single zone. We assume that a border between node0 and node1
+ * can occur within a single pageblock, but not a node0 node1 node0
+ * interleaving within a single pageblock. It is therefore sufficient to check
+ * the first and last page of a pageblock and avoid checking each individual
+ * page in a pageblock.
+ */
+struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
+				     unsigned long end_pfn, struct zone *zone)
+{
+	struct page *start_page;
+	struct page *end_page;
+
+	/* end_pfn is one past the range we are checking */
+	end_pfn--;
+
+	if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn))
+		return NULL;
+
+	start_page = pfn_to_page(start_pfn);
+
+	if (page_zone(start_page) != zone)
+		return NULL;
+
+	end_page = pfn_to_page(end_pfn);
+
+	/* This gives a shorter code than deriving page_zone(end_page) */
+	if (page_zone_id(start_page) != page_zone_id(end_page))
+		return NULL;
+
+	return start_page;
+}
+
+void set_zone_contiguous(struct zone *zone)
+{
+	unsigned long block_start_pfn = zone->zone_start_pfn;
+	unsigned long block_end_pfn;
+
+	block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages);
+	for (; block_start_pfn < zone_end_pfn(zone);
+			block_start_pfn = block_end_pfn,
+			 block_end_pfn += pageblock_nr_pages) {
+
+		block_end_pfn = min(block_end_pfn, zone_end_pfn(zone));
+
+		if (!__pageblock_pfn_to_page(block_start_pfn,
+					     block_end_pfn, zone))
+			return;
+	}
+
+	/* We confirm that there is no hole */
+	zone->contiguous = true;
+}
+
+void clear_zone_contiguous(struct zone *zone)
+{
+	zone->contiguous = false;
+}
+
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 static void __init deferred_free_range(struct page *page,
 					unsigned long pfn, int nr_pages)
@@ -1281,9 +1383,13 @@ free_range:
 	pgdat_init_report_one_done();
 	return 0;
 }
+#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 
 void __init page_alloc_init_late(void)
 {
+	struct zone *zone;
+
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 	int nid;
 
 	/* There will be num_node_state(N_MEMORY) threads */
@@ -1297,8 +1403,11 @@ void __init page_alloc_init_late(void)
 
 	/* Reinit limits that are based on free pages after the kernel is up */
 	files_maxfiles_init();
+#endif
+
+	for_each_populated_zone(zone)
+		set_zone_contiguous(zone);
 }
-#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 
 #ifdef CONFIG_CMA
 /* Free whole pageblock and set its migration type to MIGRATE_CMA. */
@@ -1387,7 +1496,7 @@ static inline int check_new_page(struct page *page)
 		bad_reason = "nonzero mapcount";
 	if (unlikely(page->mapping != NULL))
 		bad_reason = "non-NULL mapping";
-	if (unlikely(atomic_read(&page->_count) != 0))
+	if (unlikely(page_ref_count(page) != 0))
 		bad_reason = "nonzero _count";
 	if (unlikely(page->flags & __PG_HWPOISON)) {
 		bad_reason = "HWPoisoned (hardware-corrupted)";
@@ -1408,10 +1517,17 @@ static inline int check_new_page(struct page *page)
 	return 0;
 }
 
+static inline bool free_pages_prezeroed(bool poisoned)
+{
+	return IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) &&
+		page_poisoning_enabled() && poisoned;
+}
+
 static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
 								int alloc_flags)
 {
 	int i;
+	bool poisoned = true;
 
 	for (i = 0; i < (1 << order); i++) {
 		struct page *p = page + i;
@@ -1422,6 +1538,8 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
                     SetPageTOI_Untracked(p);
                     toi_make_writable(init_mm.pgd, (unsigned long) page_address(p));
                 }
+		if (poisoned)
+			poisoned &= page_is_poisoned(p);
 	}
 
 	set_page_private(page, 0);
@@ -1429,9 +1547,10 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
 
 	arch_alloc_page(page, order);
 	kernel_map_pages(page, 1 << order, 1);
+	kernel_poison_pages(page, 1 << order, 1);
 	kasan_alloc_pages(page, order);
 
-	if (gfp_flags & __GFP_ZERO)
+	if (!free_pages_prezeroed(poisoned) && (gfp_flags & __GFP_ZERO))
 		for (i = 0; i < (1 << order); i++)
 			clear_highpage(page + i);
 
@@ -2270,19 +2389,11 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
 		list_del(&page->lru);
 		pcp->count--;
 	} else {
-		if (unlikely(gfp_flags & __GFP_NOFAIL)) {
-			/*
-			 * __GFP_NOFAIL is not to be used in new code.
-			 *
-			 * All __GFP_NOFAIL callers should be fixed so that they
-			 * properly detect and handle allocation failures.
-			 *
-			 * We most definitely don't want callers attempting to
-			 * allocate greater than order-1 page units with
-			 * __GFP_NOFAIL.
-			 */
-			WARN_ON_ONCE(order > 1);
-		}
+		/*
+		 * We most definitely don't want callers attempting to
+		 * allocate greater than order-1 page units with __GFP_NOFAIL.
+		 */
+		WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
 		spin_lock_irqsave(&zone->lock, flags);
 
 		page = NULL;
@@ -2722,9 +2833,8 @@ void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...)
 		va_end(args);
 	}
 
-	pr_warn("%s: page allocation failure: order:%u, mode:0x%x\n",
-		current->comm, order, gfp_mask);
-
+	pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n",
+		current->comm, order, gfp_mask, &gfp_mask);
 	dump_stack();
 	if (!should_suppress_show_mem())
 		show_mem(filter);
@@ -2780,8 +2890,12 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
 			 * XXX: Page reclaim didn't yield anything,
 			 * and the OOM killer can't be invoked, but
 			 * keep looping as per tradition.
+			 *
+			 * But do not keep looping if oom_killer_disable()
+			 * was already called, for the system is trying to
+			 * enter a quiescent state during suspend.
 			 */
-			*did_some_progress = 1;
+			*did_some_progress = !oom_killer_disabled;
 			goto out;
 		}
 		if (pm_suspended_storage())
@@ -3040,14 +3154,6 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 				(__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)))
 		gfp_mask &= ~__GFP_ATOMIC;
 
-	/*
-	 * If this allocation cannot block and it is for a specific node, then
-	 * fail early.  There's no need to wakeup kswapd or retry for a
-	 * speculative node-specific allocation.
-	 */
-	if (IS_ENABLED(CONFIG_NUMA) && (gfp_mask & __GFP_THISNODE) && !can_direct_reclaim)
-		goto nopage;
-
 retry:
 	if (gfp_mask & __GFP_KSWAPD_RECLAIM)
 		wake_all_kswapds(order, ac);
@@ -3404,7 +3510,7 @@ refill:
 		/* Even if we own the page, we do not use atomic_set().
 		 * This would break get_page_unless_zero() users.
 		 */
-		atomic_add(size - 1, &page->_count);
+		page_ref_add(page, size - 1);
 
 		/* reset page count bias and offset to start of new frag */
 		nc->pfmemalloc = page_is_pfmemalloc(page);
@@ -3416,7 +3522,7 @@ refill:
 	if (unlikely(offset < 0)) {
 		page = virt_to_page(nc->va);
 
-		if (!atomic_sub_and_test(nc->pagecnt_bias, &page->_count))
+		if (!page_ref_sub_and_test(page, nc->pagecnt_bias))
 			goto refill;
 
 #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)
@@ -3424,7 +3530,7 @@ refill:
 		size = nc->size;
 #endif
 		/* OK, page count is 0, we can safely set it */
-		atomic_set(&page->_count, size);
+		set_page_count(page, size);
 
 		/* reset page count bias and offset to start of new frag */
 		nc->pagecnt_bias = size;
@@ -3635,6 +3741,49 @@ static inline void show_node(struct zone *zone)
 		printk("Node %d ", zone_to_nid(zone));
 }
 
+long si_mem_available(void)
+{
+	long available;
+	unsigned long pagecache;
+	unsigned long wmark_low = 0;
+	unsigned long pages[NR_LRU_LISTS];
+	struct zone *zone;
+	int lru;
+
+	for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+		pages[lru] = global_page_state(NR_LRU_BASE + lru);
+
+	for_each_zone(zone)
+		wmark_low += zone->watermark[WMARK_LOW];
+
+	/*
+	 * Estimate the amount of memory available for userspace allocations,
+	 * without causing swapping.
+	 */
+	available = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
+
+	/*
+	 * Not all the page cache can be freed, otherwise the system will
+	 * start swapping. Assume at least half of the page cache, or the
+	 * low watermark worth of cache, needs to stay.
+	 */
+	pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
+	pagecache -= min(pagecache / 2, wmark_low);
+	available += pagecache;
+
+	/*
+	 * Part of the reclaimable slab consists of items that are in use,
+	 * and cannot be freed. Cap this estimate at the low watermark.
+	 */
+	available += global_page_state(NR_SLAB_RECLAIMABLE) -
+		     min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
+
+	if (available < 0)
+		available = 0;
+	return available;
+}
+EXPORT_SYMBOL_GPL(si_mem_available);
+
 void si_meminfo(struct sysinfo *val)
 {
 	val->totalram = totalram_pages;
@@ -3967,9 +4116,7 @@ static int __parse_numa_zonelist_order(char *s)
 	} else if (*s == 'z' || *s == 'Z') {
 		user_zonelist_order = ZONELIST_ORDER_ZONE;
 	} else {
-		printk(KERN_WARNING
-			"Ignoring invalid numa_zonelist_order value:  "
-			"%s\n", s);
+		pr_warn("Ignoring invalid numa_zonelist_order value:  %s\n", s);
 		return -EINVAL;
 	}
 	return 0;
@@ -4433,12 +4580,11 @@ void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone)
 	else
 		page_group_by_mobility_disabled = 0;
 
-	pr_info("Built %i zonelists in %s order, mobility grouping %s.  "
-		"Total pages: %ld\n",
-			nr_online_nodes,
-			zonelist_order_name[current_zonelist_order],
-			page_group_by_mobility_disabled ? "off" : "on",
-			vm_total_pages);
+	pr_info("Built %i zonelists in %s order, mobility grouping %s.  Total pages: %ld\n",
+		nr_online_nodes,
+		zonelist_order_name[current_zonelist_order],
+		page_group_by_mobility_disabled ? "off" : "on",
+		vm_total_pages);
 #ifdef CONFIG_NUMA
 	pr_info("Policy zone: %s\n", zone_names[policy_zone]);
 #endif
@@ -4523,6 +4669,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
 	pg_data_t *pgdat = NODE_DATA(nid);
 	unsigned long pfn;
 	unsigned long nr_initialised = 0;
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+	struct memblock_region *r = NULL, *tmp;
+#endif
 
 	if (highest_memmap_pfn < end_pfn - 1)
 		highest_memmap_pfn = end_pfn - 1;
@@ -4536,20 +4685,51 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn++) {
 		/*
-		 * There can be holes in boot-time mem_map[]s
-		 * handed to this function.  They do not
-		 * exist on hotplugged memory.
+		 * There can be holes in boot-time mem_map[]s handed to this
+		 * function.  They do not exist on hotplugged memory.
+		 */
+		if (context != MEMMAP_EARLY)
+			goto not_early;
+
+		if (!early_pfn_valid(pfn))
+			continue;
+		if (!early_pfn_in_nid(pfn, nid))
+			continue;
+		if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised))
+			break;
+
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+		/*
+		 * If not mirrored_kernelcore and ZONE_MOVABLE exists, range
+		 * from zone_movable_pfn[nid] to end of each node should be
+		 * ZONE_MOVABLE not ZONE_NORMAL. skip it.
 		 */
-		if (context == MEMMAP_EARLY) {
-			if (!early_pfn_valid(pfn))
+		if (!mirrored_kernelcore && zone_movable_pfn[nid])
+			if (zone == ZONE_NORMAL && pfn >= zone_movable_pfn[nid])
 				continue;
-			if (!early_pfn_in_nid(pfn, nid))
+
+		/*
+		 * Check given memblock attribute by firmware which can affect
+		 * kernel memory layout.  If zone==ZONE_MOVABLE but memory is
+		 * mirrored, it's an overlapped memmap init. skip it.
+		 */
+		if (mirrored_kernelcore && zone == ZONE_MOVABLE) {
+			if (!r || pfn >= memblock_region_memory_end_pfn(r)) {
+				for_each_memblock(memory, tmp)
+					if (pfn < memblock_region_memory_end_pfn(tmp))
+						break;
+				r = tmp;
+			}
+			if (pfn >= memblock_region_memory_base_pfn(r) &&
+			    memblock_is_mirror(r)) {
+				/* already initialized as NORMAL */
+				pfn = memblock_region_memory_end_pfn(r);
 				continue;
-			if (!update_defer_init(pgdat, pfn, end_pfn,
-						&nr_initialised))
-				break;
+			}
 		}
+#endif
 
+not_early:
 		/*
 		 * Mark the block movable so that blocks are reserved for
 		 * movable at startup. This will force kernel allocations
@@ -4966,11 +5146,6 @@ static void __meminit adjust_zone_range_for_zone_movable(int nid,
 			*zone_end_pfn = min(node_end_pfn,
 				arch_zone_highest_possible_pfn[movable_zone]);
 
-		/* Adjust for ZONE_MOVABLE starting within this range */
-		} else if (*zone_start_pfn < zone_movable_pfn[nid] &&
-				*zone_end_pfn > zone_movable_pfn[nid]) {
-			*zone_end_pfn = zone_movable_pfn[nid];
-
 		/* Check if this whole range is within ZONE_MOVABLE */
 		} else if (*zone_start_pfn >= zone_movable_pfn[nid])
 			*zone_start_pfn = *zone_end_pfn;
@@ -4985,31 +5160,31 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
 					unsigned long zone_type,
 					unsigned long node_start_pfn,
 					unsigned long node_end_pfn,
+					unsigned long *zone_start_pfn,
+					unsigned long *zone_end_pfn,
 					unsigned long *ignored)
 {
-	unsigned long zone_start_pfn, zone_end_pfn;
-
 	/* When hotadd a new node from cpu_up(), the node should be empty */
 	if (!node_start_pfn && !node_end_pfn)
 		return 0;
 
 	/* Get the start and end of the zone */
-	zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
-	zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
+	*zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
+	*zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
 	adjust_zone_range_for_zone_movable(nid, zone_type,
 				node_start_pfn, node_end_pfn,
-				&zone_start_pfn, &zone_end_pfn);
+				zone_start_pfn, zone_end_pfn);
 
 	/* Check that this node has pages within the zone's required range */
-	if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn)
+	if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn)
 		return 0;
 
 	/* Move the zone boundaries inside the node if necessary */
-	zone_end_pfn = min(zone_end_pfn, node_end_pfn);
-	zone_start_pfn = max(zone_start_pfn, node_start_pfn);
+	*zone_end_pfn = min(*zone_end_pfn, node_end_pfn);
+	*zone_start_pfn = max(*zone_start_pfn, node_start_pfn);
 
 	/* Return the spanned pages */
-	return zone_end_pfn - zone_start_pfn;
+	return *zone_end_pfn - *zone_start_pfn;
 }
 
 /*
@@ -5055,6 +5230,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
 	unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type];
 	unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
 	unsigned long zone_start_pfn, zone_end_pfn;
+	unsigned long nr_absent;
 
 	/* When hotadd a new node from cpu_up(), the node should be empty */
 	if (!node_start_pfn && !node_end_pfn)
@@ -5066,7 +5242,39 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
 	adjust_zone_range_for_zone_movable(nid, zone_type,
 			node_start_pfn, node_end_pfn,
 			&zone_start_pfn, &zone_end_pfn);
-	return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
+	nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
+
+	/*
+	 * ZONE_MOVABLE handling.
+	 * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages
+	 * and vice versa.
+	 */
+	if (zone_movable_pfn[nid]) {
+		if (mirrored_kernelcore) {
+			unsigned long start_pfn, end_pfn;
+			struct memblock_region *r;
+
+			for_each_memblock(memory, r) {
+				start_pfn = clamp(memblock_region_memory_base_pfn(r),
+						  zone_start_pfn, zone_end_pfn);
+				end_pfn = clamp(memblock_region_memory_end_pfn(r),
+						zone_start_pfn, zone_end_pfn);
+
+				if (zone_type == ZONE_MOVABLE &&
+				    memblock_is_mirror(r))
+					nr_absent += end_pfn - start_pfn;
+
+				if (zone_type == ZONE_NORMAL &&
+				    !memblock_is_mirror(r))
+					nr_absent += end_pfn - start_pfn;
+			}
+		} else {
+			if (zone_type == ZONE_NORMAL)
+				nr_absent += node_end_pfn - zone_movable_pfn[nid];
+		}
+	}
+
+	return nr_absent;
 }
 
 #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
@@ -5074,8 +5282,18 @@ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
 					unsigned long zone_type,
 					unsigned long node_start_pfn,
 					unsigned long node_end_pfn,
+					unsigned long *zone_start_pfn,
+					unsigned long *zone_end_pfn,
 					unsigned long *zones_size)
 {
+	unsigned int zone;
+
+	*zone_start_pfn = node_start_pfn;
+	for (zone = 0; zone < zone_type; zone++)
+		*zone_start_pfn += zones_size[zone];
+
+	*zone_end_pfn = *zone_start_pfn + zones_size[zone_type];
+
 	return zones_size[zone_type];
 }
 
@@ -5104,15 +5322,22 @@ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
 
 	for (i = 0; i < MAX_NR_ZONES; i++) {
 		struct zone *zone = pgdat->node_zones + i;
+		unsigned long zone_start_pfn, zone_end_pfn;
 		unsigned long size, real_size;
 
 		size = zone_spanned_pages_in_node(pgdat->node_id, i,
 						  node_start_pfn,
 						  node_end_pfn,
+						  &zone_start_pfn,
+						  &zone_end_pfn,
 						  zones_size);
 		real_size = size - zone_absent_pages_in_node(pgdat->node_id, i,
 						  node_start_pfn, node_end_pfn,
 						  zholes_size);
+		if (size)
+			zone->zone_start_pfn = zone_start_pfn;
+		else
+			zone->zone_start_pfn = 0;
 		zone->spanned_pages = size;
 		zone->present_pages = real_size;
 
@@ -5233,7 +5458,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 {
 	enum zone_type j;
 	int nid = pgdat->node_id;
-	unsigned long zone_start_pfn = pgdat->node_start_pfn;
 	int ret;
 
 	pgdat_resize_init(pgdat);
@@ -5249,11 +5473,15 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 #endif
 	init_waitqueue_head(&pgdat->kswapd_wait);
 	init_waitqueue_head(&pgdat->pfmemalloc_wait);
+#ifdef CONFIG_COMPACTION
+	init_waitqueue_head(&pgdat->kcompactd_wait);
+#endif
 	pgdat_page_ext_init(pgdat);
 
 	for (j = 0; j < MAX_NR_ZONES; j++) {
 		struct zone *zone = pgdat->node_zones + j;
 		unsigned long size, realsize, freesize, memmap_pages;
+		unsigned long zone_start_pfn = zone->zone_start_pfn;
 
 		size = zone->spanned_pages;
 		realsize = freesize = zone->present_pages;
@@ -5272,8 +5500,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 					       "  %s zone: %lu pages used for memmap\n",
 					       zone_names[j], memmap_pages);
 			} else
-				printk(KERN_WARNING
-					"  %s zone: %lu pages exceeds freesize %lu\n",
+				pr_warn("  %s zone: %lu pages exceeds freesize %lu\n",
 					zone_names[j], memmap_pages, freesize);
 		}
 
@@ -5322,7 +5549,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 		ret = init_currently_empty_zone(zone, zone_start_pfn, size);
 		BUG_ON(ret);
 		memmap_init(size, nid, j, zone_start_pfn);
-		zone_start_pfn += size;
 	}
 }
 
@@ -5390,6 +5616,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
 		(u64)start_pfn << PAGE_SHIFT,
 		end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
+#else
+	start_pfn = node_start_pfn;
 #endif
 	calculate_node_totalpages(pgdat, start_pfn, end_pfn,
 				  zones_size, zholes_size);
@@ -5480,8 +5708,7 @@ static unsigned long __init find_min_pfn_for_node(int nid)
 		min_pfn = min(min_pfn, start_pfn);
 
 	if (min_pfn == ULONG_MAX) {
-		printk(KERN_WARNING
-			"Could not find start_pfn for node %d\n", nid);
+		pr_warn("Could not find start_pfn for node %d\n", nid);
 		return 0;
 	}
 
@@ -5561,6 +5788,36 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 	}
 
 	/*
+	 * If kernelcore=mirror is specified, ignore movablecore option
+	 */
+	if (mirrored_kernelcore) {
+		bool mem_below_4gb_not_mirrored = false;
+
+		for_each_memblock(memory, r) {
+			if (memblock_is_mirror(r))
+				continue;
+
+			nid = r->nid;
+
+			usable_startpfn = memblock_region_memory_base_pfn(r);
+
+			if (usable_startpfn < 0x100000) {
+				mem_below_4gb_not_mirrored = true;
+				continue;
+			}
+
+			zone_movable_pfn[nid] = zone_movable_pfn[nid] ?
+				min(usable_startpfn, zone_movable_pfn[nid]) :
+				usable_startpfn;
+		}
+
+		if (mem_below_4gb_not_mirrored)
+			pr_warn("This configuration results in unmirrored kernel memory.");
+
+		goto out2;
+	}
+
+	/*
 	 * If movablecore=nn[KMG] was specified, calculate what size of
 	 * kernelcore that corresponds so that memory usable for
 	 * any allocation type is evenly spread. If both kernelcore
@@ -5820,6 +6077,12 @@ static int __init cmdline_parse_core(char *p, unsigned long *core)
  */
 static int __init cmdline_parse_kernelcore(char *p)
 {
+	/* parse kernelcore=mirror */
+	if (parse_option_str(p, "mirror")) {
+		mirrored_kernelcore = true;
+		return 0;
+	}
+
 	return cmdline_parse_core(p, &required_kernelcore);
 }
 
@@ -5917,22 +6180,21 @@ void __init mem_init_print_info(const char *str)
 
 #undef	adj_init_size
 
-	pr_info("Memory: %luK/%luK available "
-	       "(%luK kernel code, %luK rwdata, %luK rodata, "
-	       "%luK init, %luK bss, %luK reserved, %luK cma-reserved"
+	pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved"
 #ifdef	CONFIG_HIGHMEM
-	       ", %luK highmem"
+		", %luK highmem"
 #endif
-	       "%s%s)\n",
-	       nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10),
-	       codesize >> 10, datasize >> 10, rosize >> 10,
-	       (init_data_size + init_code_size) >> 10, bss_size >> 10,
-	       (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10),
-	       totalcma_pages << (PAGE_SHIFT-10),
+		"%s%s)\n",
+		nr_free_pages() << (PAGE_SHIFT - 10),
+		physpages << (PAGE_SHIFT - 10),
+		codesize >> 10, datasize >> 10, rosize >> 10,
+		(init_data_size + init_code_size) >> 10, bss_size >> 10,
+		(physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10),
+		totalcma_pages << (PAGE_SHIFT - 10),
 #ifdef	CONFIG_HIGHMEM
-	       totalhigh_pages << (PAGE_SHIFT-10),
+		totalhigh_pages << (PAGE_SHIFT - 10),
 #endif
-	       str ? ", " : "", str ? str : "");
+		str ? ", " : "", str ? str : "");
 }
 
 /**
@@ -6107,8 +6369,17 @@ static void __setup_per_zone_wmarks(void)
 			zone->watermark[WMARK_MIN] = tmp;
 		}
 
-		zone->watermark[WMARK_LOW]  = min_wmark_pages(zone) + (tmp >> 2);
-		zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1);
+		/*
+		 * Set the kswapd watermarks distance according to the
+		 * scale factor in proportion to available memory, but
+		 * ensure a minimum size on small systems.
+		 */
+		tmp = max_t(u64, tmp >> 2,
+			    mult_frac(zone->managed_pages,
+				      watermark_scale_factor, 10000));
+
+		zone->watermark[WMARK_LOW]  = min_wmark_pages(zone) + tmp;
+		zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2;
 
 		__mod_zone_page_state(zone, NR_ALLOC_BATCH,
 			high_wmark_pages(zone) - low_wmark_pages(zone) -
@@ -6249,6 +6520,21 @@ int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write,
 	return 0;
 }
 
+int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write,
+	void __user *buffer, size_t *length, loff_t *ppos)
+{
+	int rc;
+
+	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
+	if (rc)
+		return rc;
+
+	if (write)
+		setup_per_zone_wmarks();
+
+	return 0;
+}
+
 #ifdef CONFIG_NUMA
 int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,
 	void __user *buffer, size_t *length, loff_t *ppos)
@@ -6440,11 +6726,8 @@ void *__init alloc_large_system_hash(const char *tablename,
 	if (!table)
 		panic("Failed to allocate %s hash table\n", tablename);
 
-	printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n",
-	       tablename,
-	       (1UL << log2qty),
-	       ilog2(size) - PAGE_SHIFT,
-	       size);
+	pr_info("%s hash table entries: %ld (order: %d, %lu bytes)\n",
+		tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size);
 
 	if (_hash_shift)
 		*_hash_shift = log2qty;
@@ -6595,7 +6878,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
 		 * This check already skips compound tails of THP
 		 * because their page->_count is zero at all time.
 		 */
-		if (!atomic_read(&page->_count)) {
+		if (!page_ref_count(page)) {
 			if (PageBuddy(page))
 				iter += (1 << page_order(page)) - 1;
 			continue;
@@ -6945,8 +7228,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
 		BUG_ON(!PageBuddy(page));
 		order = page_order(page);
 #ifdef CONFIG_DEBUG_VM
-		printk(KERN_INFO "remove from free list %lx %d %lx\n",
-		       pfn, 1 << order, end_pfn);
+		pr_info("remove from free list %lx %d %lx\n",
+			pfn, 1 << order, end_pfn);
 #endif
 		list_del(&page->lru);
 		rmv_page_order(page);
@@ -6959,7 +7242,6 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
 }
 #endif
 
-#ifdef CONFIG_MEMORY_FAILURE
 bool is_free_buddy_page(struct page *page)
 {
 	struct zone *zone = page_zone(page);
@@ -6978,4 +7260,3 @@ bool is_free_buddy_page(struct page *page)
 
 	return order < MAX_ORDER;
 }
-#endif