mm: pagewalk: fix documentation of PTE hole handling

Empty PTEs are passed to the pte_entry callback, not to pte_hole.

Link: https://lkml.kernel.org/r/3695521.kQq0lBPeGt@devpool047
Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h
index ac7b38ad59036d573ce56e5211e675728af5670a..f3fafb731ffd87b0e1e1a4c8dae65764bd05f6f5 100644 (file)
--- a/include/linux/pagewalk.h
+++ b/include/linux/pagewalk.h
@@ -15,12 +15,12 @@ struct mm_walk;
  *                     this handler is required to be able to handle
  *                     pmd_trans_huge() pmds.  They may simply choose to
  *                     split_huge_page() instead of handling it explicitly.
- * @pte_entry:         if set, called for each non-empty PTE (lowest-level)
- *                     entry
+ * @pte_entry:         if set, called for each PTE (lowest-level) entry,
+ *                     including empty ones
  * @pte_hole:          if set, called for each hole at all levels,
- *                     depth is -1 if not known, 0:PGD, 1:P4D, 2:PUD, 3:PMD
- *                     4:PTE. Any folded depths (where PTRS_PER_P?D is equal
- *                     to 1) are skipped.
+ *                     depth is -1 if not known, 0:PGD, 1:P4D, 2:PUD, 3:PMD.
+ *                     Any folded depths (where PTRS_PER_P?D is equal to 1)
+ *                     are skipped.
  * @hugetlb_entry:     if set, called for each hugetlb entry
  * @test_walk:         caller specific callback function to determine whether
  *                     we walk over the current vma or not. Returning 0 means