mm/thp: use the correct function when updating access flags
We should use pmdp_set_access_flags to update access flags. Archs like powerpc use extra checks(_PAGE_BUSY) when updating a hugepage PTE. A set_pmd_at doesn't do those checks. We should use set_pmd_at only when updating a none hugepage PTE. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com>a Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -1265,7 +1265,9 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
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* young bit, instead of the current set_pmd_at.
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*/
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_pmd = pmd_mkyoung(pmd_mkdirty(*pmd));
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set_pmd_at(mm, addr & HPAGE_PMD_MASK, pmd, _pmd);
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if (pmdp_set_access_flags(vma, addr & HPAGE_PMD_MASK,
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pmd, _pmd, 1))
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update_mmu_cache_pmd(vma, addr, pmd);
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}
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if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
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if (page->mapping && trylock_page(page)) {
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