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thp: fix another corner case of munlock() vs. THPs

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am: 1771fc58a3

Change-Id: Ib24b4d9f9a51c22c36ca49ce28916992267e9400
This commit is contained in:
Kirill A. Shutemov
2017-03-15 02:28:01 +00:00
committed by android-build-merger
parent 821079ce42 1771fc58a3
commit 9512164bf3
1 changed files with 4 additions and 5 deletions
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9
mm/mlock.c
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@@ -441,7 +441,7 @@ void munlock_vma_pages_range(struct vm_area_struct *vma,
while (start < end) {
struct page *page;
unsigned int page_mask;
unsigned int page_mask = 0;
unsigned long page_increm;
struct pagevec pvec;
struct zone *zone;
@@ -455,8 +455,7 @@ void munlock_vma_pages_range(struct vm_area_struct *vma,
* suits munlock very well (and if somehow an abnormal page
* has sneaked into the range, we won't oops here: great).
*/
page = follow_page_mask(vma, start, FOLL_GET | FOLL_DUMP,
&page_mask);
page = follow_page(vma, start, FOLL_GET | FOLL_DUMP);
if (page && !IS_ERR(page)) {
if (PageTransTail(page)) {
@@ -467,8 +466,8 @@ void munlock_vma_pages_range(struct vm_area_struct *vma,
/*
* Any THP page found by follow_page_mask() may
* have gotten split before reaching
* munlock_vma_page(), so we need to recompute
* the page_mask here.
* munlock_vma_page(), so we need to compute
* the page_mask here instead.
*/
page_mask = munlock_vma_page(page);
unlock_page(page);