]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/hugetlb: make pud_huge() and follow_huge_pud() aware of non-present pud entry
authorNaoya Horiguchi <naoya.horiguchi@nec.com>
Thu, 14 Jul 2022 04:24:14 +0000 (13:24 +0900)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Wed, 3 Aug 2022 18:17:12 +0000 (14:17 -0400)
commitd11f254d61bb38694e37a9622f499da22ab22aac
tree5b178b7c7cac6d7774eeb34088a1e74d08ce3be8
parent67dba6a58c18f85e47c3ef8d74a4f2cc6c3c8aa5
mm/hugetlb: make pud_huge() and follow_huge_pud() aware of non-present pud entry

follow_pud_mask() does not support non-present pud entry now.  As long as
I tested on x86_64 server, follow_pud_mask() still simply returns
no_page_table() for non-present_pud_entry() due to pud_bad(), so no severe
user-visible effect should happen.  But generally we should call
follow_huge_pud() for non-present pud entry for 1GB hugetlb page.

Update pud_huge() and follow_huge_pud() to handle non-present pud entries.
The changes are similar to previous works for pud entries commit
e66f17ff7177 ("mm/hugetlb: take page table lock in follow_huge_pmd()") and
commit cbef8478bee5 ("mm/hugetlb: pmd_huge() returns true for non-present
hugepage").

Link: https://lkml.kernel.org/r/20220714042420.1847125-3-naoya.horiguchi@linux.dev
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
arch/x86/mm/hugetlbpage.c
mm/hugetlb.c