diff --git a/sys/compat/linux/linux_socket.c b/sys/compat/linux/linux_socket.c
--- a/sys/compat/linux/linux_socket.c
+++ b/sys/compat/linux/linux_socket.c
@@ -2468,7 +2468,7 @@
 		out_offset = 0;
 
 	flags = FOF_OFFSET | FOF_NOUPDATE;
-	bufsz = min(count, MAXPHYS);
+	bufsz = min(count, maxphys);
 	buf = malloc(bufsz, M_LINUX, M_WAITOK);
 	bytes_sent = 0;
 	while (bytes_sent < count) {
diff --git a/sys/dev/md/md.c b/sys/dev/md/md.c
--- a/sys/dev/md/md.c
+++ b/sys/dev/md/md.c
@@ -965,7 +965,7 @@
 		    PAGE_MASK))));
 		iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len);
 		KASSERT(iolen > 0, ("zero iolen"));
-		KASSERT(npages <= atop(MAXPHYS + PAGE_SIZE),
+		KASSERT(npages <= atop(maxphys + PAGE_SIZE),
 		    ("npages %d too large", npages));
 		pmap_qenter(sc->kva, &bp->bio_ma[atop(ma_offs)], npages);
 		aiov.iov_base = (void *)(sc->kva + (ma_offs & PAGE_MASK));
@@ -1487,7 +1487,7 @@
 		goto bad;
 	}
 
-	sc->kva = kva_alloc(MAXPHYS + PAGE_SIZE);
+	sc->kva = kva_alloc(maxphys + PAGE_SIZE);
 	return (0);
 bad:
 	VOP_UNLOCK(nd.ni_vp);
@@ -1547,7 +1547,7 @@
 	if (sc->uma)
 		uma_zdestroy(sc->uma);
 	if (sc->kva)
-		kva_free(sc->kva, MAXPHYS + PAGE_SIZE);
+		kva_free(sc->kva, maxphys + PAGE_SIZE);
 
 	LIST_REMOVE(sc, list);
 	free_unr(md_uh, sc->unit);
diff --git a/sys/dev/rtsx/rtsx.c b/sys/dev/rtsx/rtsx.c
--- a/sys/dev/rtsx/rtsx.c
+++ b/sys/dev/rtsx/rtsx.c
@@ -311,7 +311,7 @@
 #define	RTSX_DMA_ALIGN		4
 #define	RTSX_HOSTCMD_MAX	256
 #define	RTSX_DMA_CMD_BIFSIZE	(sizeof(uint32_t) * RTSX_HOSTCMD_MAX)
-#define	RTSX_DMA_DATA_BUFSIZE	MAXPHYS
+#define	RTSX_DMA_DATA_BUFSIZE	maxphys
 
 #define	ISSET(t, f) ((t) & (f))
 
@@ -2762,7 +2762,7 @@
 			      (unsigned long)cmd->data->len, (unsigned long)cmd->data->xfer_len);
 
 	if (cmd->data->len > RTSX_DMA_DATA_BUFSIZE) {
-		device_printf(sc->rtsx_dev, "rtsx_xfer() length too large: %ld > %d\n",
+		device_printf(sc->rtsx_dev, "rtsx_xfer() length too large: %ld > %ld\n",
 			      (unsigned long)cmd->data->len, RTSX_DMA_DATA_BUFSIZE);
 		cmd->error = MMC_ERR_INVALID;
 		return (MMC_ERR_INVALID);
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c
--- a/sys/kern/subr_param.c
+++ b/sys/kern/subr_param.c
@@ -41,6 +41,7 @@
 #include "opt_maxusers.h"
 
 #include <sys/param.h>
+#include <sys/_maxphys.h>
 #include <sys/systm.h>
 #include <sys/buf.h>
 #include <sys/kernel.h>
diff --git a/sys/sys/_maxphys.h b/sys/sys/_maxphys.h
new file mode 100644
--- /dev/null
+++ b/sys/sys/_maxphys.h
@@ -0,0 +1,10 @@
+/*-
+ * This file is in the public domain.
+ */
+#ifndef MAXPHYS
+#ifdef __ILP32__
+#define MAXPHYS		(128 * 1024)
+#else
+#define MAXPHYS		(1024 * 1024)
+#endif
+#endif
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -161,6 +161,7 @@
 #include <machine/param.h>
 #ifndef _KERNEL
 #include <sys/limits.h>
+#include <sys/_maxphys.h>
 #endif
 
 #ifndef DEV_BSHIFT
@@ -174,13 +175,6 @@
 #ifndef DFLTPHYS
 #define DFLTPHYS	(64 * 1024)	/* default max raw I/O transfer size */
 #endif
-#ifndef MAXPHYS				/* max raw I/O transfer size */
-#ifdef __ILP32__
-#define MAXPHYS		(128 * 1024)
-#else
-#define MAXPHYS		(1024 * 1024)
-#endif
-#endif
 #ifndef MAXDUMPPGS
 #define MAXDUMPPGS	(DFLTPHYS/PAGE_SIZE)
 #endif