thp: madvise(MADV_NOHUGEPAGE)

Add madvise MADV_NOHUGEPAGE to mark regions that are not important to be
hugepage backed.  Return -EINVAL if the vma is not of an anonymous type,
or the feature isn't built into the kernel.  Never silently return
success.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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

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

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

diff --cc mm/huge_memory.c
Simple merge

diff --cc mm/madvise.c
Simple merge