mm/shmem: make find_get_pages_range() work for huge page

find_get_pages_range() and find_get_pages_range_tag() already correctly
increment reference count on head when seeing compound page, but they
may still use page index from tail.  Page index from tail is always
zero, so these functions don't work on huge shmem.  This hasn't been a
problem because, AFAIK, nobody calls these functions on (huge) shmem.
Fix them anyway just in case.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yu Zhao <[email protected]>
Reviewed-by: William Kucharski <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Amir Goldstein <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: "Darrick J . Wong" <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Souptick Joarder <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: "Kirill A . Shutemov" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions