diff options
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a18923e4359d..804cbfe9132d 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -32,6 +32,7 @@ #include <linux/hugetlb.h> #include <linux/memblock.h> #include <linux/bootmem.h> +#include <linux/rmap.h> #include <asm/tlbflush.h> @@ -1357,7 +1358,8 @@ static struct page *next_active_pageblock(struct page *page) int 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)) { @@ -1397,6 +1399,9 @@ int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, i++; if (i == MAX_ORDER_NR_PAGES) 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; @@ -1471,6 +1476,21 @@ 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; /* |