Commit d09b0137 authored Oct 03, 2017 by YASUAKI ISHIMATSU Committed by Linus Torvalds Oct 03, 2017

mm/memory_hotplug: define find_{smallest|biggest}_section_pfn as unsigned long

find_{smallest|biggest}_section_pfn()s find the smallest/biggest section
and return the pfn of the section.  But the functions are defined as int.
So the functions always return 0x00000000 - 0xffffffff.  It means if
memory address is over 16TB, the functions does not work correctly.

To handle 64 bit value, the patch defines
find_{smallest|biggest}_section_pfn() as unsigned long.

Fixes: 815121d2 ("memory_hotplug: clear zone when removing the memory")
Link: http://lkml.kernel.org/r/d9d5593a-d0a4-c4be-ab08-493df59a85c6@gmail.com


Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 1dd2bfc8

mm/memory_hotplug.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -338,7 +338,7 @@ EXPORT_SYMBOL_GPL(__add_pages);

		#ifdef CONFIG_MEMORY_HOTREMOVE
		/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
		static int find_smallest_section_pfn(int nid, struct zone *zone,
		static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,
		unsigned long start_pfn,
		unsigned long end_pfn)
		{
		@@ -363,7 +363,7 @@ static int find_smallest_section_pfn(int nid, struct zone *zone,
		}

		/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
		static int find_biggest_section_pfn(int nid, struct zone *zone,
		static unsigned long find_biggest_section_pfn(int nid, struct zone *zone,
		unsigned long start_pfn,
		unsigned long end_pfn)
		{

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