Minimize diffs with i686_mem.c:

- A few whitespace changes I missed in the style(9) changes.
- Move M_MEMDESC to mem.c.

sys/amd64/amd64/amd64_mem.c

@@ -110,11 +110,6 @@ static int amd64_mtrrtomrt[] = {
 
 #define	MTRRTOMRTLEN (sizeof(amd64_mtrrtomrt) / sizeof(amd64_mtrrtomrt[0]))
 
-/*
- * Used in /dev/mem drivers and elsewhere
- */
-MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
-
 static int
 amd64_mtrr2mrt(int val)
 {
@@ -479,14 +474,17 @@ amd64_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd,
 			/* Exact match? */
 			if ((curr_md->mr_base == mrd->mr_base) &&
 			    (curr_md->mr_len == mrd->mr_len)) {
+
 				/* Whoops, owned by someone. */
 				if (curr_md->mr_flags & MDF_BUSY)
 					return (EBUSY);
+
 				/* Check that we aren't doing something risky */
 				if (!(mrd->mr_flags & MDF_FORCE) &&
 				    ((curr_md->mr_flags & MDF_ATTRMASK) ==
 				    MDF_UNKNOWN))
 					return (EACCES);
+
 				/* Ok, just hijack this entry. */
 				free_md = curr_md;
 				break;

sys/amd64/amd64/mem.c

@@ -67,6 +67,11 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/memdev.h>
 
+/*
+ * Used in /dev/mem drivers and elsewhere
+ */
+MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
+
 /* ARGSUSED */
 int
 memrw(struct cdev *dev, struct uio *uio, int flags)