mm: gup: use get_user_pages_unlocked within get_user_pages_fast

This allows the get_user_pages_fast slow path to release the mmap_sem
before blocking.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andres Lagar-Cavilla <andreslc@google.com>
Cc: Peter Feiner <pfeiner@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc arch/mips/mm/gup.c
Simple merge

diff --cc arch/s390/mm/gup.c
Simple merge

diff --cc arch/sh/mm/gup.c
Simple merge

diff --cc arch/sparc/mm/gup.c
Simple merge

diff --cc arch/x86/mm/gup.c
Simple merge

diff --cc mm/gup.c
Simple merge

diff --cc mm/util.c
Simple merge