On Tue, Jun 08, 2021 at 09:30:00PM -0700, Hugh Dickins wrote:
> TTU_SYNC prevents an unlikely race, when try_to_unmap() returns shortly
> before the page is accounted as unmapped. It is unlikely to coincide
> with hwpoisoning, but now that we have the flag, hwpoison_user_mappings()
> would do well to use it.
>
> Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
> ---
> Patch added since the v1 series was posted.
>
> mm/memory-failure.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index b6806e446567..e16edefca523 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1060,7 +1060,7 @@ static int get_hwpoison_page(struct page *p, unsigned long flags,
> static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
> int flags, struct page **hpagep)
> {
> - enum ttu_flags ttu = TTU_IGNORE_MLOCK;
> + enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC;
Thanks for improving thp code.
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
