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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-11-03 00:37:36 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 21:36:48 +0400 |
| commit | 621112ec06bbe3a6dbb6af5f4db3451d01b309f9 (patch) | |
| tree | 1b8dbf57854f8bee13a88a7492d7ba8ca93ceb8c /include/linux/mm.h | |
| parent | 1a2417c30c86961992afae7eb8f803acca2f6b9b (diff) | |
| download | linux-621112ec06bbe3a6dbb6af5f4db3451d01b309f9.tar.xz | |
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/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 11 |
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) |