Merge branch 'akpm' (Andrew's patch-bomb)

Merge patches from Andrew Morton:
 "A few misc things and very nearly all of the MM tree.  A tremendous
  amount of stuff (again), including a significant rbtree library
  rework."

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (160 commits)
  sparc64: Support transparent huge pages.
  mm: thp: Use more portable PMD clearing sequenece in zap_huge_pmd().
  mm: Add and use update_mmu_cache_pmd() in transparent huge page code.
  sparc64: Document PGD and PMD layout.
  sparc64: Eliminate PTE table memory wastage.
  sparc64: Halve the size of PTE tables
  sparc64: Only support 4MB huge pages and 8KB base pages.
  memory-hotplug: suppress "Trying to free nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" warning
  mm: memcg: clean up mm_match_cgroup() signature
  mm: document PageHuge somewhat
  mm: use %pK for /proc/vmallocinfo
  mm, thp: fix mlock statistics
  mm, thp: fix mapped pages avoiding unevictable list on mlock
  memory-hotplug: update memory block's state and notify userspace
  memory-hotplug: preparation to notify memory block's state at memory hot remove
  mm: avoid section mismatch warning for memblock_type_name
  make GFP_NOTRACK definition unconditional
  cma: decrease cc.nr_migratepages after reclaiming pagelist
  CMA: migrate mlocked pages
  kpageflags: fix wrong KPF_THP on non-huge compound pages
  ...

1 files changed, 10 insertions, 17 deletions

diff --git a/mm/mlock.c b/mm/mlock.c
index ef726e8aa8e..f0b9ce572fc 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -51,15 +51,13 @@ EXPORT_SYMBOL(can_do_mlock);
 /*
  *  LRU accounting for clear_page_mlock()
  */
-void __clear_page_mlock(struct page *page)
+void clear_page_mlock(struct page *page)
 {
-	VM_BUG_ON(!PageLocked(page));
-
-	if (!page->mapping) {	/* truncated ? */
+	if (!TestClearPageMlocked(page))
 		return;
-	}
 
-	dec_zone_page_state(page, NR_MLOCK);
+	mod_zone_page_state(page_zone(page), NR_MLOCK,
+			    -hpage_nr_pages(page));
 	count_vm_event(UNEVICTABLE_PGCLEARED);
 	if (!isolate_lru_page(page)) {
 		putback_lru_page(page);
@@ -81,7 +79,8 @@ void mlock_vma_page(struct page *page)
 	BUG_ON(!PageLocked(page));
 
 	if (!TestSetPageMlocked(page)) {
-		inc_zone_page_state(page, NR_MLOCK);
+		mod_zone_page_state(page_zone(page), NR_MLOCK,
+				    hpage_nr_pages(page));
 		count_vm_event(UNEVICTABLE_PGMLOCKED);
 		if (!isolate_lru_page(page))
 			putback_lru_page(page);
@@ -108,7 +107,8 @@ void munlock_vma_page(struct page *page)
 	BUG_ON(!PageLocked(page));
 
 	if (TestClearPageMlocked(page)) {
-		dec_zone_page_state(page, NR_MLOCK);
+		mod_zone_page_state(page_zone(page), NR_MLOCK,
+				    -hpage_nr_pages(page));
 		if (!isolate_lru_page(page)) {
 			int ret = SWAP_AGAIN;
 
@@ -227,7 +227,7 @@ long mlock_vma_pages_range(struct vm_area_struct *vma,
 	if (vma->vm_flags & (VM_IO | VM_PFNMAP))
 		goto no_mlock;
 
-	if (!((vma->vm_flags & (VM_DONTEXPAND | VM_RESERVED)) ||
+	if (!((vma->vm_flags & VM_DONTEXPAND) ||
 			is_vm_hugetlb_page(vma) ||
 			vma == get_gate_vma(current->mm))) {
 
@@ -290,14 +290,7 @@ void munlock_vma_pages_range(struct vm_area_struct *vma,
 		page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP);
 		if (page && !IS_ERR(page)) {
 			lock_page(page);
-			/*
-			 * Like in __mlock_vma_pages_range(),
-			 * because we lock page here and migration is
-			 * blocked by the elevated reference, we need
-			 * only check for file-cache page truncation.
-			 */
-			if (page->mapping)
-				munlock_vma_page(page);
+			munlock_vma_page(page);
 			unlock_page(page);
 			put_page(page);
 		}