Hi，Guo Hui

首先非常感谢您参与 openEuler kernel 开发。

您的 PATCH 已经合入 openEuler-20.03，对应 commit 号如下：

openEuler-1.0-LTS    ce4cce2f893ab555ba8009bc1ba9394582428342

kernel-4.19    66dfb5b15d502a7c5fee251abc5945df4a6ec5cc

该问题已经提交 issue

https://gitee.com/openeuler/kernel/issues/I3RFV8

如果您有什么信息要同步的，可以在 issue 里面更新, 或者联系 @成坚(gatieme)

最后

再次感谢您参与 openEuler，社区有您更精彩。

-- 谢谢

  成坚(gatieme)

uniontech inclusion
category: bugfix
bugzilla: NA
CVE: NA

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")
Reported-by: Peng Yuanbo <pengyuanbo@uniontech.com>

Signed-off-by: Guo Hui <guohui@uniontech.com>
---
 mm/page_alloc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0888870e3458..6bf3d4461430 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1688,12 +1688,13 @@ static int __init deferred_init_memmap(void *data)
 		nr_free += atomic64_read(&args.nr_pages);
 	}
 
-	/* 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;
 
+	/* Sanity check that the next zone really is unpopulated */
+	WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone));
+
 	pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_free,
 					jiffies_to_msecs(jiffies - start));