autonuma: make the AUTONUMA_SCAN_PMD_FLAG conditional to CONFIG_HAVE_ARCH_AUTONUMA_SCAN_PMD

Remove the sysfs entry /sys/kernel/mm/autonuma/knuma_scand/pmd and
force the knuma_scand pmd mode off if
CONFIG_HAVE_ARCH_AUTONUMA_SCAN_PMD is not set by the architecture.

Enable AutoNUMA for PPC64.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
4 files changed