[PATCH 0/6] Add zone overlapping check

[js1304]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

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.

-----pfn-------->
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-20160311.

Thanks.

[1]: https://lkml.org/lkml/2015/2/12/95

Joonsoo Kim (6):
  mm/page_alloc: fix same zone check in __pageblock_pfn_to_page()
  mm/hugetlb: add same zone check in pfn_range_valid_gigantic()
  mm/memory_hotplug: add comment to some functions related to memory
    hotplug
  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     | 10 +++++++---
 mm/page_isolation.c |  1 +
 mm/page_owner.c     |  3 +++
 mm/vmstat.c         |  7 +++++++
 5 files changed, 24 insertions(+), 6 deletions(-)

-- 
1.9.1