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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2022-11-23 10:43:19 +0530 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:07 -0800 |
| commit | 7ce5f7e16afa82d33dc47d633404b8b1142a5e44 (patch) | |
| tree | 9fa7a9ce9de3c2b1869b41973482d340b9a6bee4 /Documentation/mm | |
| parent | be21b32afe470c5ae98e27e49201158a47032942 (diff) | |
| download | linux-7ce5f7e16afa82d33dc47d633404b8b1142a5e44.tar.gz | |
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 <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/mm')
| -rw-r--r-- | Documentation/mm/arch_pgtable_helpers.rst | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/mm/arch_pgtable_helpers.rst b/Documentation/mm/arch_pgtable_helpers.rst index cbaee9e592410f..fd2a19df884ed3 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 | +---------------------------+--------------------------------------------------+ |