mm/page_alloc: ensure kswapd doesn't accidentally go to sleep

mm/page_alloc: ensure kswapd doesn't accidentally go to sleep

Patch series "A few cleanup patches for mm", v2.

This series contains a few cleanup patches to remove the obsolete comments
and functions, use helper macro to improve readability and so on.  More
details can be found in the respective changelogs.

This patch (of 16):

If ALLOC_KSWAPD is set, wake_all_kswapds() will be called to ensure kswapd
doesn't accidentally go to sleep.  But when reserve_flags is set,
alloc_flags will be overwritten and ALLOC_KSWAPD is thus lost.  Preserve
the ALLOC_KSWAPD flag in alloc_flags to ensure kswapd won't go to sleep
accidentally.

Link: https://lkml.kernel.org/r/20220916072257.9639-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220916072257.9639-2-linmiaohe@huawei.com
Fixes: 9d64d568e71e ("mm: use alloc_flags to record if kswapd can wake")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>