[SPARC64]: mdesc.c needs linux/mm.h

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/mdesc.c

@@ -8,6 +8,7 @@
 #include <linux/log2.h>
 #include <linux/list.h>
 #include <linux/slab.h>
+#include <linux/mm.h>
 
 #include <asm/hypervisor.h>
 #include <asm/mdesc.h>