ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI
CVE: NA

-------------------------------------------------

We found a hungtask problem when do direct compact in
__alloc_pages_nodemask:

vmalloc_hugepage_user -> __vmalloc_node_range -> __vmalloc_area_node ->
sp_alloc_pages -> alloc_huge_page_node -> alloc_fresh_huge_page ->
__alloc_pages_nodemask.

Set PF_MEMALLOC then direct reclaim and direct compact won't be called.
Signed-off-by: NTang Yizhou <tangyizhou@huawei.com>
Reviewed-by: NDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>