X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Ffremap.c;h=7a9d0f5d246da922c132738f2476a688812fc1ac;hb=6ebfc0e20b409f13e62bbb84ce70102b49945cfd;hp=7f08d10ceaff4d037f5a37a5b629d89452a2dab0;hpb=861f2fb8e796022b4928cab9c74fca6681a1c557;p=pandora-kernel.git

diff --git a/mm/fremap.c b/mm/fremap.c
index 7f08d10ceaff..7a9d0f5d246d 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -27,24 +27,20 @@ static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 	struct page *page = NULL;
 
 	if (pte_present(pte)) {
-		unsigned long pfn = pte_pfn(pte);
-		flush_cache_page(vma, addr, pfn);
+		flush_cache_page(vma, addr, pte_pfn(pte));
 		pte = ptep_clear_flush(vma, addr, ptep);
-		if (unlikely(!pfn_valid(pfn))) {
-			print_bad_pte(vma, pte, addr);
-			goto out;
+		page = vm_normal_page(vma, addr, pte);
+		if (page) {
+			if (pte_dirty(pte))
+				set_page_dirty(page);
+			page_remove_rmap(page);
+			page_cache_release(page);
 		}
-		page = pfn_to_page(pfn);
-		if (pte_dirty(pte))
-			set_page_dirty(page);
-		page_remove_rmap(page);
-		page_cache_release(page);
 	} 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);
 	}
-out:
 	return !!page;
 }
 
@@ -59,27 +55,12 @@ 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;
 
-	BUG_ON(vma->vm_flags & VM_RESERVED);
-
-	pgd = pgd_offset(mm, addr);
-	spin_lock(&mm->page_table_lock);
-	
-	pud = pud_alloc(mm, pgd, addr);
-	if (!pud)
-		goto err_unlock;
-
-	pmd = pmd_alloc(mm, pud, addr);
-	if (!pmd)
-		goto err_unlock;
-
-	pte = pte_alloc_map(mm, pmd, addr);
+	pte = get_locked_pte(mm, addr, &ptl);
 	if (!pte)
-		goto err_unlock;
+		goto out;
 
 	/*
 	 * This page may have been truncated. Tell the
@@ -89,29 +70,28 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
 	inode = vma->vm_file->f_mapping->host;
 	size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 	if (!page->mapping || page->index >= size)
-		goto err_unlock;
+		goto unlock;
 	err = -ENOMEM;
 	if (page_mapcount(page) > INT_MAX/2)
-		goto err_unlock;
+		goto unlock;
 
 	if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
 		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;
-	pte_unmap(pte);
 	update_mmu_cache(vma, addr, pte_val);
-
+	lazy_mmu_prot_update(pte_val);
 	err = 0;
-err_unlock:
-	spin_unlock(&mm->page_table_lock);
+unlock:
+	pte_unmap_unlock(pte, ptl);
+out:
 	return err;
 }
 EXPORT_SYMBOL(install_page);
 
-
 /*
  * Install a file pte to a given virtual memory address, release any
  * previously existing mapping.
@@ -121,44 +101,33 @@ 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;
 
-	BUG_ON(vma->vm_flags & VM_RESERVED);
-
-	pgd = pgd_offset(mm, addr);
-	spin_lock(&mm->page_table_lock);
-	
-	pud = pud_alloc(mm, pgd, addr);
-	if (!pud)
-		goto err_unlock;
-
-	pmd = pmd_alloc(mm, pud, addr);
-	if (!pmd)
-		goto err_unlock;
-
-	pte = pte_alloc_map(mm, pmd, addr);
+	pte = get_locked_pte(mm, addr, &ptl);
 	if (!pte)
-		goto err_unlock;
+		goto out;
 
-	if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte))
+	if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte)) {
+		update_hiwater_rss(mm);
 		dec_mm_counter(mm, file_rss);
+	}
 
 	set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
 	pte_val = *pte;
-	pte_unmap(pte);
-	update_mmu_cache(vma, addr, pte_val);
-	spin_unlock(&mm->page_table_lock);
-	return 0;
-
-err_unlock:
-	spin_unlock(&mm->page_table_lock);
+	/*
+	 * 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:
 	return err;
 }
 
-
 /***
  * sys_remap_file_pages - remap arbitrary pages of a shared backing store
  *                        file within an existing vma.
@@ -214,12 +183,10 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
 	 * Make sure the vma is shared, that it supports prefaulting,
 	 * and that the remapped range is valid and fully within
 	 * the single existing vma.  vm_private_data is used as a
-	 * swapout cursor in a VM_NONLINEAR vma (unless VM_RESERVED
-	 * or VM_LOCKED, but VM_LOCKED could be revoked later on).
+	 * swapout cursor in a VM_NONLINEAR vma.
 	 */
 	if (vma && (vma->vm_flags & VM_SHARED) &&
-		(!vma->vm_private_data ||
-			(vma->vm_flags & (VM_NONLINEAR|VM_RESERVED))) &&
+		(!vma->vm_private_data || (vma->vm_flags & VM_NONLINEAR)) &&
 		vma->vm_ops && vma->vm_ops->populate &&
 			end > start && start >= vma->vm_start &&
 				end <= vma->vm_end) {