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 <linmiaohe@xxxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
