thp: support file pages in zap_huge_pmd()
split_huge_pmd() for file mappings (and DAX too) is implemented by just clearing pmd entry as we can re-fill this area from page cache on pte level later. This means we don't need deposit page tables when file THP is mapped. Therefore we shouldn't try to withdraw a page table on zap_huge_pmd() file THP PMD. Link: http://lkml.kernel.org/r/1466021202-61880-14-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1689,10 +1689,16 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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struct page *page = pmd_page(orig_pmd);
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page_remove_rmap(page, true);
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VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
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add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
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VM_BUG_ON_PAGE(!PageHead(page), page);
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pte_free(tlb->mm, pgtable_trans_huge_withdraw(tlb->mm, pmd));
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atomic_long_dec(&tlb->mm->nr_ptes);
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if (PageAnon(page)) {
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pgtable_t pgtable;
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pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd);
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pte_free(tlb->mm, pgtable);
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atomic_long_dec(&tlb->mm->nr_ptes);
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add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
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} else {
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add_mm_counter(tlb->mm, MM_FILEPAGES, -HPAGE_PMD_NR);
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}
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spin_unlock(ptl);
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tlb_remove_page_size(tlb, page, HPAGE_PMD_SIZE);
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}
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