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Miaohe Lin
3ce4fee440
When pmd is non-present, pmd_pfn returns an insane value. So we should 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. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Miaohe Lin <[email protected]> Reviewed-by: Muchun Song <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Yang Shi <[email protected]> Cc: Zach O'Keefe <[email protected]> Signed-off-by: Andrew Morton <[email protected]>