From 7ce5f7e16afa82d33dc47d633404b8b1142a5e44 Mon Sep 17 00:00:00 2001 From: Anshuman Khandual Date: Wed, 23 Nov 2022 10:43:19 +0530 Subject: documentation/mm: update pmd_present() in arch_pgtable_helpers.rst Although pmd_present() might seem to indicate a valid and mapped pmd entry, in reality it returns true when pmd_page() points to a valid page in memory , regardless whether the pmd entry is mapped or not. Andrea Arcangeli had earlier explained [1] the required semantics for pmd_present(). This just updates the documentation for pmd_present() as required. [1] https://lore.kernel.org/lkml/20181017020930.GN30832@redhat.com/ Link: https://lkml.kernel.org/r/20221123051319.1312582-1-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Acked-by: David Hildenbrand Cc: Jonathan Corbet Cc: Andrea Arcangeli Cc: Mike Rapoport Signed-off-by: Andrew Morton --- Documentation/mm/arch_pgtable_helpers.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation/mm') diff --git a/Documentation/mm/arch_pgtable_helpers.rst b/Documentation/mm/arch_pgtable_helpers.rst index cbaee9e59241..fd2a19df884e 100644 --- a/Documentation/mm/arch_pgtable_helpers.rst +++ b/Documentation/mm/arch_pgtable_helpers.rst @@ -94,7 +94,7 @@ PMD Page Table Helpers +---------------------------+--------------------------------------------------+ | pmd_trans_huge | Tests a Transparent Huge Page (THP) at PMD | +---------------------------+--------------------------------------------------+ -| pmd_present | Tests a valid mapped PMD | +| pmd_present | Tests whether pmd_page() points to valid memory | +---------------------------+--------------------------------------------------+ | pmd_young | Tests a young PMD | +---------------------------+--------------------------------------------------+ -- cgit v1.2.3