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[PATCH] mm: fix __page_mapcount()

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  [PATCH] mm: fix __page_mapcount() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-11-11 11:20 +0100

#1267086 — [PATCH] mm: fix __page_mapcount()

I made mistake in uninlining patch: we need to read _mapcount of the
page which caller pointed us to, not head page.

It's fixlet for
 "mm: uninline slowpath of page_mapcount()"

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 mm/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/util.c b/mm/util.c
index 22dae03a4ae1..5be2a4bdf76b 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -411,8 +411,8 @@ int __page_mapcount(struct page *page)
 {
 	int ret;
 
-	page = compound_head(page);
 	ret = atomic_read(&page->_mapcount) + 1;
+	page = compound_head(page);
 	ret += atomic_read(compound_mapcount_ptr(page)) + 1;
 	if (PageDoubleMap(page))
 		ret--;
-- 
2.6.2

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