[PATCH v6 06/10] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()
From: David Hildenbrand <hidden>
Date: 2019-10-06 08:57:34
Also in:
linux-mm, linux-s390, linux-sh, linuxppc-dev, lkml
Subsystem:
memory hot(un)plug, memory management, the rest · Maintainers:
David Hildenbrand, Oscar Salvador, Andrew Morton, Linus Torvalds
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 <redacted> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Dan Williams <redacted> Signed-off-by: David Hildenbrand <redacted> --- 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
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