Let's poison the pages similar to when adding new memory in
sparse_add_section(). Also call remove_pfn_range_from_zone() from
memunmap_pages(), so we can poison the memmap from there as well.
While at it, calculate the pfn in memunmap_pages() only once.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
mm/memory_hotplug.c | 3 +++
mm/memremap.c | 2 ++
2 files changed, 5 insertions(+)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5b003ffa5dc9..bf5173e7913d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -464,6 +464,9 @@ void __ref remove_pfn_range_from_zone(struct zone *zone,
struct pglist_data *pgdat = zone->zone_pgdat;
unsigned long flags;
+ /* Poison struct pages because they are now uninitialized again. */
+ page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages);
+
#ifdef CONFIG_ZONE_DEVICE
/*
* Zone shrinking code cannot properly deal with ZONE_DEVICE. So
diff --git a/mm/memremap.c b/mm/memremap.c
index 70263e6f093e..7fed8bd32a18 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -139,6 +139,8 @@ void memunmap_pages(struct dev_pagemap *pgmap)
nid = page_to_nid(first_page);
mem_hotplug_begin();
+ remove_pfn_range_from_zone(page_zone(first_page), PHYS_PFN(res->start),
+ PHYS_PFN(resource_size(res)));
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
__remove_pages(PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), NULL);
--
2.21.0
