mm/gup.c: mark undo_dev_pagemap as __maybe_unused

Several mips builds generate the following build warning.

  mm/gup.c:1788:13: warning: 'undo_dev_pagemap' defined but not used

The function is declared unconditionally but only called from behind
various ifdefs. Mark it __maybe_unused.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/gup.c b/mm/gup.c
index bb4ad57d20e3..43b7d875de37 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1796,7 +1796,8 @@ static inline pte_t gup_get_pte(pte_t *ptep)
 }
 #endif /* CONFIG_GUP_GET_PTE_LOW_HIGH */
 
-static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
+static void __maybe_unused undo_dev_pagemap(int *nr, int nr_start,
+					    struct page **pages)
 {
 	while ((*nr) - nr_start) {
 		struct page *page = pages[--(*nr)];