smaps: remove mem_size_stats->vma and use walk_page_vma()

pagewalk.c can handle vma in itself, so we don't have to pass vma via
walk->private.  And show_smap() walks pages on vma basis, so using
walk_page_vma() is preferable.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 8 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index eeab30fcffcc..73425398b38c 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -436,7 +436,6 @@ const struct file_operations proc_tid_maps_operations = {
 
 #ifdef CONFIG_PROC_PAGE_MONITOR
 struct mem_size_stats {
-        struct vm_area_struct *vma;
         unsigned long resident;
         unsigned long shared_clean;
         unsigned long shared_dirty;
@@ -485,7 +484,7 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr,
                 struct mm_walk *walk)
 {
         struct mem_size_stats *mss = walk->private;
-        struct vm_area_struct *vma = mss->vma;
+        struct vm_area_struct *vma = walk->vma;
         struct page *page = NULL;
 
         if (pte_present(*pte)) {
@@ -509,7 +508,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
                 struct mm_walk *walk)
 {
         struct mem_size_stats *mss = walk->private;
-        struct vm_area_struct *vma = mss->vma;
+        struct vm_area_struct *vma = walk->vma;
         struct page *page;
 
         /* FOLL_DUMP will return -EFAULT on huge zero page */
@@ -530,8 +529,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
                            struct mm_walk *walk)
 {
-        struct mem_size_stats *mss = walk->private;
-        struct vm_area_struct *vma = mss->vma;
+        struct vm_area_struct *vma = walk->vma;
         pte_t *pte;
         spinlock_t *ptl;
 
@@ -623,10 +621,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
         };
 
         memset(&mss, 0, sizeof mss);
-        mss.vma = vma;
         /* mmap_sem is held in m_start */
-        if (vma->vm_mm && !is_vm_hugetlb_page(vma))
-                walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
+        walk_page_vma(vma, &smaps_walk);
 
         show_map_vma(m, vma, is_pid);