Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH] mm: fix __page_mapcount() | Date | Wed, 11 Nov 2015 12:09:17 +0200 |
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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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