[PATCH -mm v7 03/13] pagewalk: add walk_page_vma()

[Naoya Horiguchi]

Introduces walk_page_vma(), which is useful for the callers which want to
walk over a given vma.  It's used by later patches.

Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
ChangeLog v3:
- check walk_page_test's return value instead of walk->skip
---
 include/linux/mm.h |  1 +
 mm/pagewalk.c      | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git mmotm-2014-11-05-16-01.orig/include/linux/mm.h mmotm-2014-11-05-16-01/include/linux/mm.h
index 25a4cf75b575..1022cc27150e 100644
--- mmotm-2014-11-05-16-01.orig/include/linux/mm.h
+++ mmotm-2014-11-05-16-01/include/linux/mm.h
@@ -1157,6 +1157,7 @@ struct mm_walk {
 
 int walk_page_range(unsigned long addr, unsigned long end,
 		struct mm_walk *walk);
+int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 		unsigned long end, unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
diff --git mmotm-2014-11-05-16-01.orig/mm/pagewalk.c mmotm-2014-11-05-16-01/mm/pagewalk.c
index d9cc3caae802..4c9a653ba563 100644
--- mmotm-2014-11-05-16-01.orig/mm/pagewalk.c
+++ mmotm-2014-11-05-16-01/mm/pagewalk.c
@@ -272,3 +272,21 @@ int walk_page_range(unsigned long start, unsigned long end,
 	} while (start = next, start < end);
 	return err;
 }
+
+int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)
+{
+	int err;
+
+	if (!walk->mm)
+		return -EINVAL;
+
+	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
+	VM_BUG_ON(!vma);
+	walk->vma = vma;
+	err = walk_page_test(vma->vm_start, vma->vm_end, walk);
+	if (err > 0)
+		return 0;
+	if (err < 0)
+		return err;
+	return __walk_page_range(vma->vm_start, vma->vm_end, walk);
+}
-- 
2.2.0.rc0.2.gf745acb
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