summaryrefslogtreecommitdiff
path: root/mm/memory_hotplug.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0f962cc3f1bf..b4c8d7b9ab82 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -34,6 +34,7 @@
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/compaction.h>
+#include <linux/rmap.h>
#include <asm/tlbflush.h>
@@ -1470,7 +1471,8 @@ static struct page *next_active_pageblock(struct page *page)
bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
{
struct page *page = pfn_to_page(start_pfn);
- struct page *end_page = page + nr_pages;
+ unsigned long end_pfn = min(start_pfn + nr_pages, zone_end_pfn(page_zone(page)));
+ struct page *end_page = pfn_to_page(end_pfn);
/* Check the starting page of each pageblock within the range */
for (; page < end_page; page = next_active_pageblock(page)) {
@@ -1510,6 +1512,9 @@ int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
i++;
if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn)
continue;
+ /* Check if we got outside of the zone */
+ if (zone && !zone_spans_pfn(zone, pfn + i))
+ return 0;
page = pfn_to_page(pfn + i);
if (zone && page_zone(page) != zone)
return 0;
@@ -1617,6 +1622,21 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
continue;
}
+ /*
+ * HWPoison pages have elevated reference counts so the migration would
+ * fail on them. It also doesn't make any sense to migrate them in the
+ * first place. Still try to unmap such a page in case it is still mapped
+ * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep
+ * the unmap as the catch all safety net).
+ */
+ if (PageHWPoison(page)) {
+ if (WARN_ON(PageLRU(page)))
+ isolate_lru_page(page);
+ if (page_mapped(page))
+ try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS);
+ continue;
+ }
+
if (!get_page_unless_zero(page))
continue;
/*