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Subject[PATCH v4 4/8] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()
Date
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@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
mm/memory_hotplug.c | 3 +++
mm/memremap.c | 7 ++++---
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 4da59ec14dbb..5bfca690a922 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);
+
/*
* Zone shrinking code cannot properly deal with ZONE_DEVICE. So
* we will not try to shrink the zones - which is okay as
diff --git a/mm/memremap.c b/mm/memremap.c
index cb90c3e8804a..48f573502f88 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -125,7 +125,7 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap)
void memunmap_pages(struct dev_pagemap *pgmap)
{
struct resource *res = &pgmap->res;
- unsigned long pfn;
+ unsigned long pfn = PHYS_PFN(res->start);
int nid;

dev_pagemap_kill(pgmap);
@@ -134,11 +134,12 @@ void memunmap_pages(struct dev_pagemap *pgmap)
dev_pagemap_cleanup(pgmap);

/* pages are dead and unused, undo the arch mapping */
- nid = page_to_nid(pfn_to_page(PHYS_PFN(res->start)));
+ nid = page_to_nid(pfn_to_page(pfn));

mem_hotplug_begin();
+ remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn,
+ PHYS_PFN(resource_size(res)));
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
- pfn = PHYS_PFN(res->start);
__remove_pages(pfn, PHYS_PFN(resource_size(res)), NULL);
} else {
arch_remove_memory(nid, res->start, resource_size(res),
--
2.21.0
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