On 11/12/20 9:31 AM, Catalin Marinas wrote:

On Tue, Nov 10, 2020 at 11:10:25PM +0100, Andrey Konovalov wrote:

quoted

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?

Yes, the reason is I am not sure why it disappeared from the submitted patch ;)
I am going to respin the patch.

-- 
Regards,
Vincenzo

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