[PATCH] xenbus: fix compile failure on ARM with Xen enabled

[Steven Noonan]

Adding an include of linux/mm.h resolves this:
	drivers/xen/xenbus/xenbus_client.c: In function âxenbus_map_ring_valloc_hvmâ:
	drivers/xen/xenbus/xenbus_client.c:532:66: error: implicit declaration of function âpage_to_sectionâ [-Werror=implicit-function-declaration]

Signed-off-by: Steven Noonan <steven@xxxxxxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_client.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index bcf3ba4..61786be 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -30,6 +30,7 @@
  * IN THE SOFTWARE.
  */
 
+#include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
-- 
1.8.1.2

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