On Thu, Jun 23, 2022 at 01:06:21AM +0800, Miaohe Lin wrote:
> When pmd is non-present, pmd_pfn returns an insane value. So we should
Although it does not cause any problems, it is better to check pmd_present()
in advance. The change looks good to me. So
> check pmd_present first to avoid acquiring such insane value and also
> avoid touching possible cold huge_zero_pfn cache line when pmd isn't
> present.
>
> Signed-off-by: Miaohe Lin <[email protected]>
Reviewed-by: Muchun Song <[email protected]>