The patch titled
Subject: mm, page_alloc: fail has_unmovable_pages when seeing reserved pages
has been added to the -mm tree. Its filename is
mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm, page_alloc: fail has_unmovable_pages when seeing reserved pages
Reserved pages should be completely ignored by the core mm because they
have a special meaning for their owners. has_unmovable_pages doesn't
check those so we rely on other tests (reference count, or PageLRU) to
fail on such pages. Althought this happens to work it is safer to simply
check for those explicitly and do not rely on the owner of the page to
abuse those fields for special purposes.
Please note that this is more of a further fortification of the code
rahter than a fix of an existing issue.
Link: http://lkml.kernel.org/r/20171013120756.jeopthigbmm3c7bl@xxxxxxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Igor Mammedov <imammedo@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Reza Arbab <arbab@xxxxxxxxxxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Yasuaki Ishimatsu <yasu.isimatu@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/page_alloc.c~mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages
+++ a/mm/page_alloc.c
@@ -7370,6 +7370,9 @@ bool has_unmovable_pages(struct zone *zo
page = pfn_to_page(check);
+ if (PageReserved(page))
+ return true;
+
/*
* Hugepages are not in LRU lists, but they're movable.
* We need not scan over tail pages bacause we don't
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-memory_hotplug-do-not-back-off-draining-pcp-free-pages-from-kworker-context.patch
mm-drop-migrate-type-checks-from-has_unmovable_pages.patch
mm-page_alloc-fail-has_unmovable_pages-when-seeing-reserved-pages.patch
mm-memory_hotplug-do-not-fail-offlining-too-early.patch
mm-memory_hotplug-remove-timeout-from-__offline_memory.patch
mm-hugetlb-drop-hugepages_treat_as_movable-sysctl.patch
mm-arch-remove-empty_bad_page.patch
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