One hopeful usecase of memory hotplug is to replace half-broken DIMMs with new ones, so it makes sense to clear hwpoison info at the time of memory hotremove. I hope that this patch covers the topic discussed in https://lkml.org/lkml/2018/1/17/1228 Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> --- mm/page_alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git v4.19-mmotm-2018-10-30-16-08/mm/page_alloc.c v4.19-mmotm-2018-10-30-16-08_patched/mm/page_alloc.c index 970d6ff..27826b3 100644 --- v4.19-mmotm-2018-10-30-16-08/mm/page_alloc.c +++ v4.19-mmotm-2018-10-30-16-08_patched/mm/page_alloc.c @@ -8139,8 +8139,9 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) * The HWPoisoned page may be not in buddy system, and * page_count() is not 0. */ - if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { + if (unlikely(!PageBuddy(page) && TestClearPageHWPoison(page))) { pfn++; + num_poisoned_pages_dec(); SetPageReserved(page); continue; } -- 2.7.0
