Merge branch 'akpm' (patches from Andrew)

Merge yet more updates from Andrew Morton:
 "The rest of MM and a kernel-wide procfs cleanup.

  Summary of the more significant patches:

   - Patch series "mm/memory_hotplug: Factor out memory block
     devicehandling", v3. David Hildenbrand.

     Some spring-cleaning of the memory hotplug code, notably in
     drivers/base/memory.c

   - "mm: thp: fix false negative of shmem vma's THP eligibility". Yang
     Shi.

     Fix /proc/pid/smaps output for THP pages used in shmem.

   - "resource: fix locking in find_next_iomem_res()" + 1. Nadav Amit.

     Bugfix and speedup for kernel/resource.c

   - Patch series "mm: Further memory block device cleanups", David
     Hildenbrand.

     More spring-cleaning of the memory hotplug code.

   - Patch series "mm: Sub-section memory hotplug support". Dan
     Williams.

     Generalise the memory hotplug code so that pmem can use it more
     completely. Then remove the hacks from the libnvdimm code which
     were there to work around the memory-hotplug code's constraints.

   - "proc/sysctl: add shared variables for range check", Matteo Croce.

     We have about 250 instances of

          int zero;
          ...
                  .extra1 = &zero,

     in the tree. This is a tree-wide sweep to make all those private
     "zero"s and "one"s use global variables.

     Alas, it isn't practical to make those two global integers const"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (38 commits)
  proc/sysctl: add shared variables for range check
  mm: migrate: remove unused mode argument
  mm/sparsemem: cleanup 'section number' data types
  libnvdimm/pfn: stop padding pmem namespaces to section alignment
  libnvdimm/pfn: fix fsdax-mode namespace info-block zero-fields
  mm/devm_memremap_pages: enable sub-section remap
  mm: document ZONE_DEVICE memory-model implications
  mm/sparsemem: support sub-section hotplug
  mm/sparsemem: prepare for sub-section ranges
  mm: kill is_dev_zone() helper
  mm/hotplug: kill is_dev_zone() usage in __remove_pages()
  mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap()
  mm/hotplug: prepare shrink_{zone, pgdat}_span for sub-section removal
  mm/sparsemem: add helpers track active portions of a section at boot
  mm/sparsemem: introduce a SECTION_IS_EARLY flag
  mm/sparsemem: introduce struct mem_section_usage
  drivers/base/memory.c: get rid of find_memory_block_hinted()
  mm/memory_hotplug: move and simplify walk_memory_blocks()
  mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns
  mm: make register_mem_sect_under_node() static
  ...

fs/aio.c

@@ -425,7 +425,7 @@ static int aio_migratepage(struct address_space *mapping, struct page *new,
 	BUG_ON(PageWriteback(old));
 	get_page(new);
 
-	rc = migrate_page_move_mapping(mapping, new, old, mode, 1);
+	rc = migrate_page_move_mapping(mapping, new, old, 1);
 	if (rc != MIGRATEPAGE_SUCCESS) {
 		put_page(new);
 		goto out_unlock;

fs/eventpoll.c

@@ -291,7 +291,7 @@ static LIST_HEAD(tfile_check_list);
 
 #include <linux/sysctl.h>
 
-static long zero;
+static long long_zero;
 static long long_max = LONG_MAX;
 
 struct ctl_table epoll_table[] = {
@@ -301,7 +301,7 @@ struct ctl_table epoll_table[] = {
 		.maxlen		= sizeof(max_user_watches),
 		.mode		= 0644,
 		.proc_handler	= proc_doulongvec_minmax,
-		.extra1		= &zero,
+		.extra1		= &long_zero,
 		.extra2		= &long_max,
 	},
 	{ }

fs/f2fs/data.c

@@ -2919,7 +2919,7 @@ int f2fs_migrate_page(struct address_space *mapping,
 	/* one extra reference was held for atomic_write page */
 	extra_count = atomic_written ? 1 : 0;
 	rc = migrate_page_move_mapping(mapping, newpage,
-				page, mode, extra_count);
+				page, extra_count);
 	if (rc != MIGRATEPAGE_SUCCESS) {
 		if (atomic_written)
 			mutex_unlock(&fi->inmem_lock);

fs/iomap.c

@@ -566,7 +566,7 @@ iomap_migrate_page(struct address_space *mapping, struct page *newpage,
 {
 	int ret;
 
-	ret = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
+	ret = migrate_page_move_mapping(mapping, newpage, page, 0);
 	if (ret != MIGRATEPAGE_SUCCESS)
 		return ret;
 

fs/notify/inotify/inotify_user.c

@@ -45,8 +45,6 @@ struct kmem_cache *inotify_inode_mark_cachep __read_mostly;
 
 #include <linux/sysctl.h>
 
-static int zero;
-
 struct ctl_table inotify_table[] = {
 	{
 		.procname	= "max_user_instances",
@@ -54,7 +52,7 @@ struct ctl_table inotify_table[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero,
+		.extra1		= SYSCTL_ZERO,
 	},
 	{
 		.procname	= "max_user_watches",
@@ -62,7 +60,7 @@ struct ctl_table inotify_table[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero,
+		.extra1		= SYSCTL_ZERO,
 	},
 	{
 		.procname	= "max_queued_events",
@@ -70,7 +68,7 @@ struct ctl_table inotify_table[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero
+		.extra1		= SYSCTL_ZERO
 	},
 	{ }
 };

fs/proc/proc_sysctl.c

@@ -22,6 +22,10 @@ static const struct inode_operations proc_sys_inode_operations;
 static const struct file_operations proc_sys_dir_file_operations;
 static const struct inode_operations proc_sys_dir_operations;
 
+/* shared constants to be used in various sysctls */
+const int sysctl_vals[] = { 0, 1, INT_MAX };
+EXPORT_SYMBOL(sysctl_vals);
+
 /* Support for permanently empty directories */
 
 struct ctl_table sysctl_mount_point[] = {

fs/proc/task_mmu.c

@@ -832,7 +832,8 @@ static int show_smap(struct seq_file *m, void *v)
 
 	__show_smap(m, &mss, false);
 
-	seq_printf(m, "THPeligible:    %d\n", transparent_hugepage_enabled(vma));
+	seq_printf(m, "THPeligible:		%d\n",
+		   transparent_hugepage_enabled(vma));
 
 	if (arch_pkeys_enabled())
 		seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));

fs/ubifs/file.c

@@ -1470,7 +1470,7 @@ static int ubifs_migrate_page(struct address_space *mapping,
 {
 	int rc;
 
-	rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
+	rc = migrate_page_move_mapping(mapping, newpage, page, 0);
 	if (rc != MIGRATEPAGE_SUCCESS)
 		return rc;