Merge branch 'akpm' (patches from Andrew)

Merge misc VM fixes from Andrew Morton:
 "A bunch of hotfixes, all affecting mm/.

  The two-patch series from Andrea may be controversial. This restores
  patches which were reverted in Dec 2018 due to a regression report [*].

  After extensive discussion it is evident that the problems which these
  patches solved were significantly more serious than the problems they
  introduced. I am told that major distros are already carrying these
  two patches for this reason"

[*] See

      https://lore.kernel.org/lkml/alpine.DEB.2.21.1812061343240.144733@chino.kir.corp.google.com/
      https://lore.kernel.org/lkml/alpine.DEB.2.21.1812031545560.161134@chino.kir.corp.google.com/

  for the google-specific issues brought up by David Rijentes. And as
  Andrew says:

    "I'm unaware of anyone else who will be adversely affected by this,
     and google already carries over a thousand kernel patches - another
     won't kill them.

     There has been sporadic discussion about fixing these things for
     real but it's clear that nobody apart from David is particularly
     motivated"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  hugetlbfs: fix hugetlb page migration/fault race causing SIGBUS
  mm, vmscan: do not special-case slab reclaim when watermarks are boosted
  Revert "mm, thp: restore node-local hugepage allocations"
  Revert "Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask""
  include/asm-generic/5level-fixup.h: fix variable 'p4d' set but not used
  seq_file: fix problem when seeking mid-record
  mm: workingset: fix vmstat counters for shadow nodes
  mm/usercopy: use memory range to be accessed for wraparound check
  mm: kmemleak: disable early logging in case of error
  mm/vmalloc.c: fix percpu free VM area search criteria
  mm/memcontrol.c: fix use after free in mem_cgroup_iter()
  mm/z3fold.c: fix z3fold_destroy_pool() race condition
  mm/z3fold.c: fix z3fold_destroy_pool() ordering
  mm: mempolicy: handle vma with unmovable pages mapped correctly in mbind
  mm: mempolicy: make the behavior consistent when MPOL_MF_MOVE* and MPOL_MF_STRICT were specified
  mm/hmm: fix bad subpage pointer in try_to_unmap_one
  mm/hmm: fix ZONE_DEVICE anon page mapping reuse
  mm: document zone device struct page field usage

5 files changed, 53 insertions, 12 deletions

diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h
index bb6cb347018c..f6947da70d71 100644
--- a/include/asm-generic/5level-fixup.h
+++ b/include/asm-generic/5level-fixup.h
@@ -19,9 +19,24 @@
 
 #define p4d_alloc(mm, pgd, address)	(pgd)
 #define p4d_offset(pgd, start)		(pgd)
-#define p4d_none(p4d)			0
-#define p4d_bad(p4d)			0
-#define p4d_present(p4d)		1
+
+#ifndef __ASSEMBLY__
+static inline int p4d_none(p4d_t p4d)
+{
+	return 0;
+}
+
+static inline int p4d_bad(p4d_t p4d)
+{
+	return 0;
+}
+
+static inline int p4d_present(p4d_t p4d)
+{
+	return 1;
+}
+#endif
+
 #define p4d_ERROR(p4d)			do { } while (0)
 #define p4d_clear(p4d)			pgd_clear(p4d)
 #define p4d_val(p4d)			pgd_val(p4d)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index fb07b503dc45..f33881688f42 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -510,22 +510,18 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
 }
 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
 			struct vm_area_struct *vma, unsigned long addr,
-			int node, bool hugepage);
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
-	alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
+			int node);
 #else
 #define alloc_pages(gfp_mask, order) \
 		alloc_pages_node(numa_node_id(), gfp_mask, order)
-#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
-	alloc_pages(gfp_mask, order)
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
+#define alloc_pages_vma(gfp_mask, order, vma, addr, node)\
 	alloc_pages(gfp_mask, order)
 #endif
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
 #define alloc_page_vma(gfp_mask, vma, addr)			\
-	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
+	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id())
 #define alloc_page_vma_node(gfp_mask, vma, addr, node)		\
-	alloc_pages_vma(gfp_mask, 0, vma, addr, node, false)
+	alloc_pages_vma(gfp_mask, 0, vma, addr, node)
 
 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 44c41462be33..2cd4359cb38c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -668,6 +668,7 @@ static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
 
 void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 			int val);
+void __mod_lruvec_slab_state(void *p, enum node_stat_item idx, int val);
 
 static inline void mod_lruvec_state(struct lruvec *lruvec,
 				    enum node_stat_item idx, int val)
@@ -1072,6 +1073,14 @@ static inline void mod_lruvec_page_state(struct page *page,
 	mod_node_page_state(page_pgdat(page), idx, val);
 }
 
+static inline void __mod_lruvec_slab_state(void *p, enum node_stat_item idx,
+					   int val)
+{
+	struct page *page = virt_to_head_page(p);
+
+	__mod_node_page_state(page_pgdat(page), idx, val);
+}
+
 static inline
 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 					    gfp_t gfp_mask,
@@ -1159,6 +1168,16 @@ static inline void __dec_lruvec_page_state(struct page *page,
 	__mod_lruvec_page_state(page, idx, -1);
 }
 
+static inline void __inc_lruvec_slab_state(void *p, enum node_stat_item idx)
+{
+	__mod_lruvec_slab_state(p, idx, 1);
+}
+
+static inline void __dec_lruvec_slab_state(void *p, enum node_stat_item idx)
+{
+	__mod_lruvec_slab_state(p, idx, -1);
+}
+
 /* idx can be of type enum memcg_stat_item or node_stat_item */
 static inline void inc_memcg_state(struct mem_cgroup *memcg,
 				   int idx)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 5228c62af416..bac395f1d00a 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -139,6 +139,8 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
 struct mempolicy *get_task_policy(struct task_struct *p);
 struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
 		unsigned long addr);
+struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
+						unsigned long addr);
 bool vma_policy_mof(struct vm_area_struct *vma);
 
 extern void numa_default_policy(void);
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 3a37a89eb7a7..6a7a1083b6fb 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -159,7 +159,16 @@ struct page {
 			/** @pgmap: Points to the hosting device page map. */
 			struct dev_pagemap *pgmap;
 			void *zone_device_data;
-			unsigned long _zd_pad_1;	/* uses mapping */
+			/*
+			 * ZONE_DEVICE private pages are counted as being
+			 * mapped so the next 3 words hold the mapping, index,
+			 * and private fields from the source anonymous or
+			 * page cache page while the page is migrated to device
+			 * private memory.
+			 * ZONE_DEVICE MEMORY_DEVICE_FS_DAX pages also
+			 * use the mapping, index, and private fields when
+			 * pmem backed DAX files are mapped.
+			 */
 		};
 
 		/** @rcu_head: You can use this to free a page by RCU. */