[PATCH] freepgt: hugetlb area is clean

[firefly-linux-kernel-4.4.55.git] / arch / ppc64 / mm / hugetlbpage.c

diff --git a/arch/ppc64/mm/hugetlbpage.c b/arch/ppc64/mm/hugetlbpage.c
index 8665bb57e42bb77349276a36ce82b98e13ea3fac..390296efe3e0b4dc32e6703204b252b782732847 100644 (file)
--- a/arch/ppc64/mm/hugetlbpage.c
+++ b/arch/ppc64/mm/hugetlbpage.c
@@ -203,8 +203,6 @@ static int prepare_low_seg_for_htlb(struct mm_struct *mm, unsigned long seg)
        unsigned long start = seg << SID_SHIFT;
        unsigned long end = (seg+1) << SID_SHIFT;
        struct vm_area_struct *vma;
-       unsigned long addr;
-       struct mmu_gather *tlb;
 
        BUG_ON(seg >= 16);
 
@@ -213,41 +211,6 @@ static int prepare_low_seg_for_htlb(struct mm_struct *mm, unsigned long seg)
        if (vma && (vma->vm_start < end))
                return -EBUSY;
 
-       /* Clean up any leftover PTE pages in the region */
-       spin_lock(&mm->page_table_lock);
-       tlb = tlb_gather_mmu(mm, 0);
-       for (addr = start; addr < end; addr += PMD_SIZE) {
-               pgd_t *pgd = pgd_offset(mm, addr);
-               pmd_t *pmd;
-               struct page *page;
-               pte_t *pte;
-               int i;
-
-               if (pgd_none(*pgd))
-                       continue;
-               pmd = pmd_offset(pgd, addr);
-               if (!pmd || pmd_none(*pmd))
-                       continue;
-               if (pmd_bad(*pmd)) {
-                       pmd_ERROR(*pmd);
-                       pmd_clear(pmd);
-                       continue;
-               }
-               pte = (pte_t *)pmd_page_kernel(*pmd);
-               /* No VMAs, so there should be no PTEs, check just in case. */
-               for (i = 0; i < PTRS_PER_PTE; i++) {
-                       BUG_ON(!pte_none(*pte));
-                       pte++;
-               }
-               page = pmd_page(*pmd);
-               pmd_clear(pmd);
-               mm->nr_ptes--;
-               dec_page_state(nr_page_table_pages);
-               pte_free_tlb(tlb, page);
-       }
-       tlb_finish_mmu(tlb, start, end);
-       spin_unlock(&mm->page_table_lock);
-
        return 0;
 }