mm: pagewalk: add api documentation for walk_page_range_novma()

Link: https://lkml.kernel.org/r/8991525.CDJkKcVGEf@devpool047
Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 9b3db11a4d1db85e4b9f2c771c21aa84584729c8..908ec1577f4018f9b996b5ad3b832858fcca7180 100644 (file)
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -479,7 +479,15 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
        return err;
 }
 
-/*
+/**
+ * walk_page_range_novma - walk a range of pagetables not backed by a vma
+ * @mm:                mm_struct representing the target process of page table walk
+ * @start:     start address of the virtual address range
+ * @end:       end address of the virtual address range
+ * @ops:       operation to call during the walk
+ * @pgd:       pgd to walk if different from mm->pgd
+ * @private:   private data for callbacks' usage
+ *
  * Similar to walk_page_range() but can walk any page tables even if they are
  * not backed by VMAs. Because 'unusual' entries may be walked this function
  * will also not lock the PTEs for the pte_entry() callback. This is useful for