[PATCH v3 1/2] mm, hwpoison: Try to recover from copy-on write faults

[Luck, Tony]

>> +	vfrom = kmap_local_page(from);
>> +	vto = kmap_local_page(to);
>> +	ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
>
> In copy_user_highpage(), kmsan_unpoison_memory(page_address(to), PAGE_SIZE) is done after the copy when
> __HAVE_ARCH_COPY_USER_HIGHPAGE isn't defined. Do we need to do something similar here? But I'm not familiar
> with kmsan, so I can easy be wrong.

It looks like that kmsan_unpoison_memory() call was added recently, after I copied
copy_user_highpage() to create copy_mc_user_highpage(). I'm not familiar with
kmsan either. Adding Alexander to this thread since they added that code.

> Anyway, this patch looks good to me. Thanks.
>
> Reviewed-by: Miaohe Lin <linmiaohe at huawei.com>

Thanks for the review.

-Tony