mm: mempolicy: Implement change_prot_numa() in terms of change_protection()

This patch converts change_prot_numa() to use change_protection(). As
pte_numa and friends check the PTE bits directly it is necessary for
change_protection() to use pmd_mknuma(). Hence the required
modifications to change_protection() are a little clumsy but the
end result is that most of the numa page table helpers are just one or
two instructions.

Signed-off-by: Mel Gorman <mgorman@suse.de>

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

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

diff --cc mm/huge_memory.c
Simple merge

diff --cc mm/mempolicy.c
Simple merge

diff --cc mm/mprotect.c
Simple merge