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-rw-r--r--include/linux/mm.h1
-rw-r--r--mm/pagewalk.c18
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3891a368e5e0..a4d24f3c5430 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1201,6 +1201,7 @@ 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 a/mm/pagewalk.c b/mm/pagewalk.c
index d9cc3caae802..4c9a653ba563 100644
--- a/mm/pagewalk.c
+++ b/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);
+}