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authorAndrea Arcangeli <aarcange@redhat.com>2011-11-02 13:37:36 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:36:48 -0800
commit621112ec06bbe3a6dbb6af5f4db3451d01b309f9 (patch)
tree1b8dbf57854f8bee13a88a7492d7ba8ca93ceb8c /include
parent1a2417c30c86961992afae7eb8f803acca2f6b9b (diff)
thp: share get_huge_page_tail()
commit b35a35b556f5e6b7993ad0baf20173e75c09ce8c upstream. This avoids duplicating the function in every arch gup_fast. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 26fd168c670a..18eea056b47d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -375,6 +375,17 @@ static inline int page_count(struct page *page)
return atomic_read(&compound_head(page)->_count);
}
+static inline void get_huge_page_tail(struct page *page)
+{
+ /*
+ * __split_huge_page_refcount() cannot run
+ * from under us.
+ */
+ VM_BUG_ON(page_mapcount(page) < 0);
+ VM_BUG_ON(atomic_read(&page->_count) != 0);
+ atomic_inc(&page->_mapcount);
+}
+
extern bool __get_page_tail(struct page *page);
static inline void get_page(struct page *page)