linux-kernel - [PATCH 2/2] mm/memory_hotplug: define find_{smallest|biggest}_section

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Date:   Fri, 15 Sep 2017 22:53:49 -0400
From:   YASUAKI ISHIMATSU <yasu.isimatu@...il.com>
To:     linux-mm@...ck.org
Cc:     Michal Hocko <mhocko@...e.com>, qiuxishi@...wei.com,
        arbab@...ux.vnet.ibm.com, vbabka@...e.cz,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] 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.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
---
 mm/memory_hotplug.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 38c3c37..120e45b 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -582,7 +582,7 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,

 #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)
 {
@@ -607,7 +607,7 @@ 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)
 {
-- 
1.8.3.1