X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Ffremap.c;h=7a9d0f5d246da922c132738f2476a688812fc1ac;hb=7fdeaf68a16f8102659cf1b30f57247d8ccbeef0;hp=f851775e09c2a27f66763ef9e239c025f2ae8c6a;hpb=2226340eb8df9c42f9fca74582d08d5117fc0cec;p=powerpc.git

diff --git a/mm/fremap.c b/mm/fremap.c
index f851775e09..7a9d0f5d24 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -39,7 +39,7 @@ static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 	} else {
 		if (!pte_file(pte))
 			free_swap_and_cache(pte_to_swp_entry(pte));
-		pte_clear(mm, addr, ptep);
+		pte_clear_not_present_full(mm, addr, ptep, 0);
 	}
 	return !!page;
 }
@@ -55,20 +55,10 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
 	pgoff_t size;
 	int err = -ENOMEM;
 	pte_t *pte;
-	pmd_t *pmd;
-	pud_t *pud;
-	pgd_t *pgd;
 	pte_t pte_val;
 	spinlock_t *ptl;
 
-	pgd = pgd_offset(mm, addr);
-	pud = pud_alloc(mm, pgd, addr);
-	if (!pud)
-		goto out;
-	pmd = pmd_alloc(mm, pud, addr);
-	if (!pmd)
-		goto out;
-	pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
+	pte = get_locked_pte(mm, addr, &ptl);
 	if (!pte)
 		goto out;
 
@@ -89,10 +79,11 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		inc_mm_counter(mm, file_rss);
 
 	flush_icache_page(vma, page);
-	set_pte_at(mm, addr, pte, mk_pte(page, prot));
+	pte_val = mk_pte(page, prot);
+	set_pte_at(mm, addr, pte, pte_val);
 	page_add_file_rmap(page);
-	pte_val = *pte;
 	update_mmu_cache(vma, addr, pte_val);
+	lazy_mmu_prot_update(pte_val);
 	err = 0;
 unlock:
 	pte_unmap_unlock(pte, ptl);
@@ -110,20 +101,10 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 {
 	int err = -ENOMEM;
 	pte_t *pte;
-	pmd_t *pmd;
-	pud_t *pud;
-	pgd_t *pgd;
 	pte_t pte_val;
 	spinlock_t *ptl;
 
-	pgd = pgd_offset(mm, addr);
-	pud = pud_alloc(mm, pgd, addr);
-	if (!pud)
-		goto out;
-	pmd = pmd_alloc(mm, pud, addr);
-	if (!pmd)
-		goto out;
-	pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
+	pte = get_locked_pte(mm, addr, &ptl);
 	if (!pte)
 		goto out;
 
@@ -134,7 +115,13 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 
 	set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
 	pte_val = *pte;
-	update_mmu_cache(vma, addr, pte_val);
+	/*
+	 * We don't need to run update_mmu_cache() here because the "file pte"
+	 * being installed by install_file_pte() is not a real pte - it's a
+	 * non-present entry (like a swap entry), noting what file offset should
+	 * be mapped there when there's a fault (in a non-linear vma where
+	 * that's not obvious).
+	 */
 	pte_unmap_unlock(pte, ptl);
 	err = 0;
 out: