1 files changed, 97 insertions, 74 deletions

diff --git a/mm/mincore.c b/mm/mincore.c
index 1f6574c5167b..a0c4c10bbab7 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -19,6 +19,42 @@
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 
+static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
+				unsigned long addr, unsigned long nr,
+				unsigned char *vec)
+{
+#ifdef CONFIG_HUGETLB_PAGE
+	struct hstate *h;
+	int i;
+
+	i = 0;
+	h = hstate_vma(vma);
+	while (1) {
+		unsigned char present;
+		pte_t *ptep;
+		/*
+		 * Huge pages are always in RAM for now, but
+		 * theoretically it needs to be checked.
+		 */
+		ptep = huge_pte_offset(current->mm,
+				       addr & huge_page_mask(h));
+		present = ptep && !huge_pte_none(huge_ptep_get(ptep));
+		while (1) {
+			vec[i++] = present;
+			addr += PAGE_SIZE;
+			/* reach buffer limit */
+			if (i == nr)
+				return;
+			/* check hugepage border */
+			if (!(addr & ~huge_page_mask(h)))
+				break;
+		}
+	}
+#else
+	BUG();
+#endif
+}
+
 /*
  * Later we can get more picky about what "in core" means precisely.
  * For now, simply check to see if the page is in the page cache,
@@ -49,6 +85,64 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
 	return present;
 }
 
+static void mincore_unmapped_range(struct vm_area_struct *vma,
+				unsigned long addr, unsigned long nr,
+				unsigned char *vec)
+{
+	int i;
+
+	if (vma->vm_file) {
+		pgoff_t pgoff;
+
+		pgoff = linear_page_index(vma, addr);
+		for (i = 0; i < nr; i++, pgoff++)
+			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
+	} else {
+		for (i = 0; i < nr; i++)
+			vec[i] = 0;
+	}
+}
+
+static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+			unsigned long addr, unsigned long nr,
+			unsigned char *vec)
+{
+	spinlock_t *ptl;
+	pte_t *ptep;
+	int i;
+
+	ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+	for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
+		pte_t pte = *ptep;
+		pgoff_t pgoff;
+
+		if (pte_none(pte))
+			mincore_unmapped_range(vma, addr, 1, vec);
+		else if (pte_present(pte))
+			vec[i] = 1;
+		else if (pte_file(pte)) {
+			pgoff = pte_to_pgoff(pte);
+			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
+		} else { /* pte is a swap entry */
+			swp_entry_t entry = pte_to_swp_entry(pte);
+
+			if (is_migration_entry(entry)) {
+				/* migration entries are always uptodate */
+				vec[i] = 1;
+			} else {
+#ifdef CONFIG_SWAP
+				pgoff = entry.val;
+				vec[i] = mincore_page(&swapper_space, pgoff);
+#else
+				WARN_ON(1);
+				vec[i] = 1;
+#endif
+			}
+		}
+	}
+	pte_unmap_unlock(ptep - 1, ptl);
+}
+
 /*
  * Do a chunk of "sys_mincore()". We've already checked
  * all the arguments, we hold the mmap semaphore: we should
@@ -59,11 +153,7 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
 	pgd_t *pgd;
 	pud_t *pud;
 	pmd_t *pmd;
-	pte_t *ptep;
-	spinlock_t *ptl;
 	unsigned long nr;
-	int i;
-	pgoff_t pgoff;
 	struct vm_area_struct *vma;
 
 	vma = find_vma(current->mm, addr);
@@ -72,35 +162,10 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
 
 	nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
 
-#ifdef CONFIG_HUGETLB_PAGE
 	if (is_vm_hugetlb_page(vma)) {
-		struct hstate *h;
-
-		i = 0;
-		h = hstate_vma(vma);
-		while (1) {
-			unsigned char present;
-			/*
-			 * Huge pages are always in RAM for now, but
-			 * theoretically it needs to be checked.
-			 */
-			ptep = huge_pte_offset(current->mm,
-					       addr & huge_page_mask(h));
-			present = ptep && !huge_pte_none(huge_ptep_get(ptep));
-			while (1) {
-				vec[i++] = present;
-				addr += PAGE_SIZE;
-				/* reach buffer limit */
-				if (i == nr)
-					return nr;
-				/* check hugepage border */
-				if (!(addr & ~huge_page_mask(h)))
-					break;
-			}
-		}
+		mincore_hugetlb_page_range(vma, addr, nr, vec);
 		return nr;
 	}
-#endif
 
 	/*
 	 * Calculate how many pages there are left in the last level of the
@@ -118,53 +183,11 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
 	if (pmd_none_or_clear_bad(pmd))
 		goto none_mapped;
 
-	ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
-	for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
-		pte_t pte = *ptep;
-
-		if (pte_none(pte)) {
-			if (vma->vm_file) {
-				pgoff = linear_page_index(vma, addr);
-				vec[i] = mincore_page(vma->vm_file->f_mapping,
-						pgoff);
-			} else
-				vec[i] = 0;
-		} else if (pte_present(pte))
-			vec[i] = 1;
-		else if (pte_file(pte)) {
-			pgoff = pte_to_pgoff(pte);
-			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
-		} else { /* pte is a swap entry */
-			swp_entry_t entry = pte_to_swp_entry(pte);
-
-			if (is_migration_entry(entry)) {
-				/* migration entries are always uptodate */
-				vec[i] = 1;
-			} else {
-#ifdef CONFIG_SWAP
-				pgoff = entry.val;
-				vec[i] = mincore_page(&swapper_space, pgoff);
-#else
-				WARN_ON(1);
-				vec[i] = 1;
-#endif
-			}
-		}
-	}
-	pte_unmap_unlock(ptep - 1, ptl);
-
+	mincore_pte_range(vma, pmd, addr, nr, vec);
 	return nr;
 
 none_mapped:
-	if (vma->vm_file) {
-		pgoff = linear_page_index(vma, addr);
-		for (i = 0; i < nr; i++, pgoff++)
-			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
-	} else {
-		for (i = 0; i < nr; i++)
-			vec[i] = 0;
-	}
-
+	mincore_unmapped_range(vma, addr, nr, vec);
 	return nr;
 }