openEuler-20.03] mm/page_alloc: fix managed_pages of zones incorrect

Commit eb761d6521c3 ("mm: parallelize deferred struct page initialization
within each node") the code "++zone" in follow code:
/* Sanity check that the next zone really is unpopulated */
WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone));
VM_BUG_ON(nr_init != nr_free);

zone->managed_pages += nr_free;

makes the managed_pages statistics of the current zone incorrect
and the zone may have out-of-bounds memory when
CONFIG_DEFERRED_STRUCT_PAGE_INIT=y, causing the Virtual machine
system startup to fail when the Virtual machine system current
allocated memory is set to half of the Virtual machine
maximum memory using virt-manager tool

Fix it by putting the code “zone->managed_pages += nr_free;”
before “++zone” code

Fixes: eb761d6521c3 ("mm: parallelize deferred struct page initialization
within each node")

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分支	commit	tag
openEuler-1.0-LTS	ce4cce2f893ab555ba8009bc1ba9394582428342	openEuler-1.0-LTS
kernel-4.19	66dfb5b15d502a7c5fee251abc5945df4a6ec5cc	kernel-4.19

@Guo Hui 补丁已经合入 openEuler-20.03

谢谢贡献

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