mm-hwpoison-try-to-recover-from-copy-on-write-faults-v4

add call to kmsan_unpoison_memory(), per Miaohe Lin

Link: https://lkml.kernel.org/r/[email protected]
Reviewed-by: Dan Williams <[email protected]>
Reviewed-by: Miaohe Lin <[email protected]>
Reviewed-by: Naoya Horiguchi <[email protected]>
Tested-by: Shuai Xue <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: aegl

include/linux/highmem.h

@@ -329,6 +329,8 @@ static inline int copy_mc_user_highpage(struct page *to, struct page *from,
 	vfrom = kmap_local_page(from);
 	vto = kmap_local_page(to);
 	ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
+	if (!ret)
+		kmsan_unpoison_memory(page_address(to), PAGE_SIZE);
 	kunmap_local(vto);
 	kunmap_local(vfrom);