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/1562072523-22311-1-git-send-email-linux@roeck-us.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/gup.c b/mm/gup.c
index bb4ad57d20e341e4581bec066aecb009aed1c168..43b7d875de3716fb20353fb732ddcc531b5f2b54 100644 (file)
--- 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)];