share_pool: Don't do direct reclaim or compact for vmalloc_huge* funcs

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


CVE: NA

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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: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>