diff options
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index b756ee36f7f0..8d010ef2ce1c 100644 --- a/mm/util.c +++ b/mm/util.c @@ -412,6 +412,12 @@ int __page_mapcount(struct page *page) int ret; ret = atomic_read(&page->_mapcount) + 1; + /* + * For file THP page->_mapcount contains total number of mapping + * of the page: no need to look into compound_mapcount. + */ + if (!PageAnon(page) && !PageHuge(page)) + return ret; page = compound_head(page); ret += atomic_read(compound_mapcount_ptr(page)) + 1; if (PageDoubleMap(page)) |