[PATCH v4 4/8] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()

[David Hildenbrand]

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 <a...@linux-foundation.org>
Cc: David Hildenbrand <da...@redhat.com>
Cc: Oscar Salvador <osalva...@suse.de>
Cc: Michal Hocko <mho...@suse.com>
Cc: Pavel Tatashin <pasha.tatas...@soleen.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: David Hildenbrand <da...@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