rmap: drop support of non-linear mappings

We don't create non-linear mappings anymore.  Let's drop code which
handles them in rmap.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc Documentation/cachetlb.txt
Simple merge

diff --cc fs/inode.c
Simple merge

diff --cc include/linux/fs.h
Simple merge

diff --cc include/linux/mm.h
Simple merge

diff --cc include/linux/mm_types.h
Simple merge

diff --cc include/linux/rmap.h
Simple merge

diff --cc kernel/fork.c
Simple merge

diff --cc mm/migrate.c
Simple merge

diff --cc mm/mmap.c
Simple merge

diff --cc mm/rmap.c
Simple merge

diff --cc mm/swap.c
Simple merge