Hi, I updated the unpoison patchset based on feedbacks for v3. I fixed a typo in patch description and closed raced in unpoison_taken_off_page() reported by Yang Shi. As for the build failure reported from build bot, I commented about disabling X86_SUPPORTS_MEMORY_FAILURE for i386 at first, but I'm not 100% sure that someone could use the subsystem for 32 bit system, so I shift to the easier way (setting MAGIC_HWPOISON to 32-bit integer value). ----- (cover letter copied from v2) ----- Main purpose of this series is to sync unpoison code to recent changes around how hwpoison code takes page refcount. Unpoison should work or simply fail (without crash) if impossible. The recent works of keeping hwpoison pages in shmem pagecache introduce a new state of hwpoisoned pages, but unpoison for such pages is not supported yet with this series. It seems that soft-offline and unpoison can be used as general purpose page offline/online mechanism (not in the context of memory error). I think that we need some additional works to realize it because currently soft-offline and unpoison are assumed not to happen so frequently (print out too many messages for aggressive usecases). But anyway this could be another interesting next topic. v1: https://lore.kernel.org/linux-mm/20210614021212.223326-1-nao.horiguchi@xxxxxxxxx/ v2: https://lore.kernel.org/linux-mm/20211025230503.2650970-1-naoya.horiguchi@xxxxxxxxx/ v3: https://lore.kernel.org/linux-mm/20211105055058.3152564-1-naoya.horiguchi@xxxxxxxxx/ Thanks, Naoya Horiguchi --- Summary: Naoya Horiguchi (3): mm/hwpoison: mf_mutex for soft offline and unpoison mm/hwpoison: remove MF_MSG_BUDDY_2ND and MF_MSG_POISONED_HUGE mm/hwpoison: fix unpoison_memory() include/linux/mm.h | 3 +- include/linux/page-flags.h | 4 ++ include/ras/ras_event.h | 2 - mm/memory-failure.c | 171 ++++++++++++++++++++++++++++----------------- mm/page_alloc.c | 27 +++++++ 5 files changed, 139 insertions(+), 68 deletions(-)
