[PATCH] m32r: mm: fix build warning

[Sudip Mukherjee]

The build of m32r was giving warning:
mm/pgtable-generic.c: In function 'ptep_clear_flush':
mm/pgtable-generic.c:76:20: warning:
	unused variable 'mm' [-Wunused-variable]

The implementation of ptep_get_and_clear() and pte_accessible()
does not use 'mm'.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx>
---

build log is at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/201416051

 mm/pgtable-generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 4ed5908..58f5937 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -73,7 +73,7 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
 		       pte_t *ptep)
 {
-	struct mm_struct *mm = (vma)->vm_mm;
+	struct mm_struct __maybe_unused *mm = (vma)->vm_mm;
 	pte_t pte;
 	pte = ptep_get_and_clear(mm, address, ptep);
 	if (pte_accessible(mm, pte))
-- 
2.7.4