On Tue, Nov 10, 2020 at 11:10:25PM +0100, Andrey Konovalov wrote:
> diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
> index 70a71f38b6a9..f0efa4847e2f 100644
> --- a/arch/arm64/mm/copypage.c
> +++ b/arch/arm64/mm/copypage.c
> @@ -23,6 +23,7 @@ void copy_highpage(struct page *to, struct page *from)
>
> if (system_supports_mte() && test_bit(PG_mte_tagged, &from->flags)) {
> set_bit(PG_mte_tagged, &to->flags);
> + page_kasan_tag_reset(to);
> mte_copy_page_tags(kto, kfrom);
Any reason why this doesn't have an smp_wmb() between resetting the tags
and copying them into kto?
--
Catalin
