linux-kernel - [PATCH 1/2] mm/memory_hotplug: Export shrink span functions for zone and node

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Message-Id: <20220126170002.19754-1-tome01@ajou.ac.kr>
Date:   Thu, 27 Jan 2022 02:00:01 +0900
From:   Jonghyeon Kim <tome01@...u.ac.kr>
To:     dan.j.williams@...el.com
Cc:     vishal.l.verma@...el.com, dave.jiang@...el.com,
        akpm@...ux-foundation.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jonghyeon Kim <tome01@...u.ac.kr>
Subject: [PATCH 1/2] mm/memory_hotplug: Export shrink span functions for zone and node

Export shrink_zone_span() and update_pgdat_span() functions to head
file. We need to update real number of spanned pages for NUMA nodes and
zones when we add memory device node such as device dax memory.

Signed-off-by: Jonghyeon Kim <tome01@...u.ac.kr>
---
 include/linux/memory_hotplug.h | 3 +++
 mm/memory_hotplug.c            | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index be48e003a518..25c7f60c317e 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -337,6 +337,9 @@ extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
 extern void remove_pfn_range_from_zone(struct zone *zone,
 				       unsigned long start_pfn,
 				       unsigned long nr_pages);
+extern void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
+			     unsigned long end_pfn);
+extern void update_pgdat_span(struct pglist_data *pgdat);
 extern bool is_memblock_offlined(struct memory_block *mem);
 extern int sparse_add_section(int nid, unsigned long pfn,
 		unsigned long nr_pages, struct vmem_altmap *altmap);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2a9627dc784c..38f46a9ef853 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -389,7 +389,7 @@ static unsigned long find_biggest_section_pfn(int nid, struct zone *zone,
 	return 0;
 }
 
-static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
+void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
 			     unsigned long end_pfn)
 {
 	unsigned long pfn;
@@ -428,8 +428,9 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
 		}
 	}
 }
+EXPORT_SYMBOL_GPL(shrink_zone_span);
 
-static void update_pgdat_span(struct pglist_data *pgdat)
+void update_pgdat_span(struct pglist_data *pgdat)
 {
 	unsigned long node_start_pfn = 0, node_end_pfn = 0;
 	struct zone *zone;
@@ -456,6 +457,7 @@ static void update_pgdat_span(struct pglist_data *pgdat)
 	pgdat->node_start_pfn = node_start_pfn;
 	pgdat->node_spanned_pages = node_end_pfn - node_start_pfn;
 }
+EXPORT_SYMBOL_GPL(update_pgdat_span);
 
 void __ref remove_pfn_range_from_zone(struct zone *zone,
 				      unsigned long start_pfn,
-- 
2.17.1