[PATCH 02/14] mm/vmalloc: Include header for prototype of set_iounmap_nonlazy

[Mel Gorman <mgorman@techsingularity.net>]

make W=1 generates the following warning for mm/vmalloc.c

  mm/vmalloc.c:1599:6: warning: no previous prototype for ‘set_iounmap_nonlazy’ [-Wmissing-prototypes]
   void set_iounmap_nonlazy(void)
        ^~~~~~~~~~~~~~~~~~~

This is an arch-generic function only used by x86. On other arches,
it's dead code. Include the header with the definition and make
it x86-64 specific.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmalloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a13ac524f6ff..0522a418b1c5 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -36,6 +36,7 @@
 #include <linux/overflow.h>
 #include <linux/pgtable.h>
 #include <linux/uaccess.h>
+#include <linux/io.h>
 #include <asm/tlbflush.h>
 #include <asm/shmparam.h>
 
@@ -1592,6 +1593,7 @@ static DEFINE_MUTEX(vmap_purge_lock);
 /* for per-CPU blocks */
 static void purge_fragmented_blocks_allcpus(void);
 
+#ifdef CONFIG_X86_64
 /*
  * called before a call to iounmap() if the caller wants vm_area_struct's
  * immediately freed.
@@ -1600,6 +1602,7 @@ void set_iounmap_nonlazy(void)
 {
 	atomic_long_set(&vmap_lazy_nr, lazy_max_pages()+1);
 }
+#endif /* CONFIG_X86_64 */
 
 /*
  * Purges all lazily-freed vmap areas.
-- 
2.26.2