Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - a few misc bits

 - ocfs2

 - most(?) of MM

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (125 commits)
  thp: fix comments of __pmd_trans_huge_lock()
  cgroup: remove unnecessary 0 check from css_from_id()
  cgroup: fix idr leak for the first cgroup root
  mm: memcontrol: fix documentation for compound parameter
  mm: memcontrol: remove BUG_ON in uncharge_list
  mm: fix build warnings in <linux/compaction.h>
  mm, thp: convert from optimistic swapin collapsing to conservative
  mm, thp: fix comment inconsistency for swapin readahead functions
  thp: update Documentation/{vm/transhuge,filesystems/proc}.txt
  shmem: split huge pages beyond i_size under memory pressure
  thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE
  khugepaged: add support of collapse for tmpfs/shmem pages
  shmem: make shmem_inode_info::lock irq-safe
  khugepaged: move up_read(mmap_sem) out of khugepaged_alloc_page()
  thp: extract khugepaged from mm/huge_memory.c
  shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings
  shmem: add huge pages support
  shmem: get_unmapped_area align huge page
  shmem: prepare huge= mount option and sysfs knob
  mm, rmap: account shmem thp pages
  ...

1 files changed, 21 insertions, 33 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index cc2a99e..abc1c5f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3179,7 +3179,6 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			    unsigned long start, unsigned long end,
 			    struct page *ref_page)
 {
-	int force_flush = 0;
 	struct mm_struct *mm = vma->vm_mm;
 	unsigned long address;
 	pte_t *ptep;
@@ -3198,19 +3197,22 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
 	tlb_start_vma(tlb, vma);
 	mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
 	address = start;
-again:
 	for (; address < end; address += sz) {
 		ptep = huge_pte_offset(mm, address);
 		if (!ptep)
 			continue;
 
 		ptl = huge_pte_lock(h, mm, ptep);
-		if (huge_pmd_unshare(mm, &address, ptep))
-			goto unlock;
+		if (huge_pmd_unshare(mm, &address, ptep)) {
+			spin_unlock(ptl);
+			continue;
+		}
 
 		pte = huge_ptep_get(ptep);
-		if (huge_pte_none(pte))
-			goto unlock;
+		if (huge_pte_none(pte)) {
+			spin_unlock(ptl);
+			continue;
+		}
 
 		/*
 		 * Migrating hugepage or HWPoisoned hugepage is already
@@ -3218,7 +3220,8 @@ again:
 		 */
 		if (unlikely(!pte_present(pte))) {
 			huge_pte_clear(mm, address, ptep);
-			goto unlock;
+			spin_unlock(ptl);
+			continue;
 		}
 
 		page = pte_page(pte);
@@ -3228,9 +3231,10 @@ again:
 		 * are about to unmap is the actual page of interest.
 		 */
 		if (ref_page) {
-			if (page != ref_page)
-				goto unlock;
-
+			if (page != ref_page) {
+				spin_unlock(ptl);
+				continue;
+			}
 			/*
 			 * Mark the VMA as having unmapped its page so that
 			 * future faults in this VMA will fail rather than
@@ -3246,30 +3250,14 @@ again:
 
 		hugetlb_count_sub(pages_per_huge_page(h), mm);
 		page_remove_rmap(page, true);
-		force_flush = !__tlb_remove_page(tlb, page);
-		if (force_flush) {
-			address += sz;
-			spin_unlock(ptl);
-			break;
-		}
-		/* Bail out after unmapping reference page if supplied */
-		if (ref_page) {
-			spin_unlock(ptl);
-			break;
-		}
-unlock:
+
 		spin_unlock(ptl);
-	}
-	/*
-	 * mmu_gather ran out of room to batch pages, we break out of
-	 * the PTE lock to avoid doing the potential expensive TLB invalidate
-	 * and page-free while holding it.
-	 */
-	if (force_flush) {
-		force_flush = 0;
-		tlb_flush_mmu(tlb);
-		if (address < end && !ref_page)
-			goto again;
+		tlb_remove_page_size(tlb, page, huge_page_size(h));
+		/*
+		 * Bail out after unmapping reference page if supplied
+		 */
+		if (ref_page)
+			break;
 	}
 	mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
 	tlb_end_vma(tlb, vma);