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authorNaoya Horiguchi <naoya.horiguchi@nec.com>2022-07-14 07:24:14 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-08-09 04:06:43 +0300
commit3a194f3f8ad01bce00bd7174aaba1563bcc827eb (patch)
treefceab93f83fadb0d5567805024fde0589c649c26 /mm/memory-failure.c
parentc0531714d6e3fd720b7dacc2de2d0503a995bcdc (diff)
downloadlinux-3a194f3f8ad01bce00bd7174aaba1563bcc827eb.tar.xz
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>
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