On 2022/2/21 10:15, luofei wrote:
> After successfully obtaining the reference count of the huge
> page, it is still necessary to call hwpoison_filter() to make a
> filter judgement, otherwise the filter hugepage will be unmaped
> and the related process may be killed.
>
LGTM. Thanks.
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
BTW: It seems there is also another missing call to hwpoison_filter() when we
encounter free_buddy_page in memory_failure(). But I'am not sure.
> Signed-off-by: luofei <luofei@xxxxxxxxxxxx>
> ---
> mm/memory-failure.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 59d6d939a752..17a7b0a94ab9 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1548,6 +1548,17 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
> lock_page(head);
> page_flags = head->flags;
>
> + if (hwpoison_filter(p)) {
> + if (TestClearPageHWPoison(head))
> + num_poisoned_pages_dec();
> + put_page(p);
> + if (flags & MF_MCE_HANDLE)
> + res = -EHWPOISON;
> + else
> + res = 0;
> + goto out;
> + }
> +
> /*
> * TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
> * simply disable it. In order to make it work properly, we need
>
