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Date:	Fri,  1 Apr 2016 11:06:41 +0900
To:	Andrew Morton <>
Cc:	Rik van Riel <>,
	Johannes Weiner <>,
	Mel Gorman <>,
	Laura Abbott <>,
	Minchan Kim <>,
	Marek Szyprowski <>,
	Michal Nazarewicz <>,
	"Aneesh Kumar K.V" <>,
	Vlastimil Babka <>,
	"Rafael J. Wysocki" <>,,, Joonsoo Kim <>
Subject: [PATCH v2 0/5] Add zone overlapping check

From: Joonsoo Kim <>

Change from v1
o drop patch 1 ("mm/page_alloc: fix same zone check in
__pageblock_pfn_to_page()") per Mel's comment

Hello, all.

This patchset deals with some problematic sites that iterate pfn range.

There is a system that node's pfn are overlapped like as following.

N0 N1 N2 N0 N1 N2

Therefore, we need to care this overlapping when iterating pfn range.

I audit many iterating sites that uses pfn_valid(), pfn_valid_within(),
zone_start_pfn and etc. and others looks safe for me. This is
a preparation step for new CMA implementation, ZONE_CMA [1], because
it would be easily overlapped with other zones. But, zone overlap
check is also needed for general case so I send it separately.

This is based on next-20160330.



Joonsoo Kim (5):
  mm/hugetlb: add same zone check in pfn_range_valid_gigantic()
  mm/memory_hotplug: add comment to some functions related to memory
  mm/vmstat: add zone range overlapping check
  mm/page_owner: add zone range overlapping check
  power: add zone range overlapping check

 mm/hugetlb.c        | 9 ++++++---
 mm/page_alloc.c     | 7 ++++++-
 mm/page_isolation.c | 1 +
 mm/page_owner.c     | 3 +++
 mm/vmstat.c         | 7 +++++++
 5 files changed, 23 insertions(+), 4 deletions(-)


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