In order to reduce use of M_EXT outside of the mbuf allocator and

socket-buffer implementations, introduce a return value for MCLGET()
(and m_cljget() that underlies it) to allow the caller to avoid testing
M_EXT itself.  Update all callers to use the return value.

With this change, very few network device drivers remain aware of
M_EXT; the primary exceptions lie in mbuf-chain pretty printers for
debugging, and in a few cases, custom mbuf and cluster allocation
implementations.

NB: This is a difficult-to-test change as it touches many drivers for
which I don't have physical devices.  Instead we've gone for intensive
review, but further post-commit review would definitely be appreciated
to spot errors where changes could not easily be made mechanically,
but were largely mechanical in nature.

Differential Revision:	https://reviews.freebsd.org/D1440
Reviewed by:	adrian, bz, gnn
Sponsored by:	EMC / Isilon Storage Division

32 files changed, 37 insertions, 81 deletions

diff --git a/sys/dev/an/if_an.c b/sys/dev/an/if_an.c
index bee2a0c..3433cd5 100644
--- a/sys/dev/an/if_an.c
+++ b/sys/dev/an/if_an.c
@@ -943,8 +943,7 @@ an_rxeof(struct an_softc *sc)
 				if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 				return;
 			}
-			MCLGET(m, M_NOWAIT);
-			if (!(m->m_flags & M_EXT)) {
+			if (!(MCLGET(m, M_NOWAIT))) {
 				m_freem(m);
 				if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 				return;
@@ -1034,8 +1033,7 @@ an_rxeof(struct an_softc *sc)
 					if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 					return;
 				}
-				MCLGET(m, M_NOWAIT);
-				if (!(m->m_flags & M_EXT)) {
+				if (!(MCLGET(m, M_NOWAIT))) {
 					m_freem(m);
 					if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 					return;
diff --git a/sys/dev/bge/if_bge.c b/sys/dev/bge/if_bge.c
index 58f529d..af4fddb 100644
--- a/sys/dev/bge/if_bge.c
+++ b/sys/dev/bge/if_bge.c
@@ -1383,8 +1383,7 @@ bge_newbuf_jumbo(struct bge_softc *sc, int i)
 	if (m == NULL)
 		return (ENOBUFS);
 
-	m_cljget(m, M_NOWAIT, MJUM9BYTES);
-	if (!(m->m_flags & M_EXT)) {
+	if (m_cljget(m, M_NOWAIT, MJUM9BYTES) == NULL) {
 		m_freem(m);
 		return (ENOBUFS);
 	}
diff --git a/sys/dev/ce/if_ce.c b/sys/dev/ce/if_ce.c
index d0dd0c7..7d81720 100644
--- a/sys/dev/ce/if_ce.c
+++ b/sys/dev/ce/if_ce.c
@@ -307,8 +307,7 @@ static struct mbuf *makembuf (void *buf, unsigned len)
 	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_NOWAIT);
-	if (! (m->m_flags & M_EXT)) {
+	if (!(MCLGET(m, M_NOWAIT))) {
 		m_freem (m);
 		return 0;
 	}
diff --git a/sys/dev/cm/smc90cx6.c b/sys/dev/cm/smc90cx6.c
index a1932ad..5607298 100644
--- a/sys/dev/cm/smc90cx6.c
+++ b/sys/dev/cm/smc90cx6.c
@@ -540,10 +540,7 @@ cm_srint_locked(vsc)
 	 */
 	if ((len + 2 + 2) > MHLEN) {
 		/* attach an mbuf cluster */
-		MCLGET(m, M_NOWAIT);
-
-		/* Insist on getting a cluster */
-		if ((m->m_flags & M_EXT) == 0) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 			goto cleanup;
 		}
diff --git a/sys/dev/cp/if_cp.c b/sys/dev/cp/if_cp.c
index 4e70838..3d07ef2 100644
--- a/sys/dev/cp/if_cp.c
+++ b/sys/dev/cp/if_cp.c
@@ -191,8 +191,7 @@ static struct mbuf *makembuf (void *buf, unsigned len)
 	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_NOWAIT);
-	if (! (m->m_flags & M_EXT)) {
+	if (!(MCLGET (m, M_NOWAIT))) {
 		m_freem (m);
 		return 0;
 	}
diff --git a/sys/dev/cs/if_cs.c b/sys/dev/cs/if_cs.c
index 8ad50eb..a9b0d08 100644
--- a/sys/dev/cs/if_cs.c
+++ b/sys/dev/cs/if_cs.c
@@ -716,8 +716,7 @@ cs_get_packet(struct cs_softc *sc)
 		return (-1);
 
 	if (length > MHLEN) {
-		MCLGET(m, M_NOWAIT);
-		if (!(m->m_flags & M_EXT)) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			return (-1);
 		}
diff --git a/sys/dev/ctau/if_ct.c b/sys/dev/ctau/if_ct.c
index d0b68bc..2e9d2e2 100644
--- a/sys/dev/ctau/if_ct.c
+++ b/sys/dev/ctau/if_ct.c
@@ -194,8 +194,7 @@ static struct mbuf *makembuf (void *buf, u_int len)
 	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_NOWAIT);
-	if (! (m->m_flags & M_EXT)) {
+	if (!(MCLGET(m, M_NOWAIT))) {
 		m_freem (m);
 		return 0;
 	}
diff --git a/sys/dev/ed/if_ed.c b/sys/dev/ed/if_ed.c
index 46524dd..be9d274 100644
--- a/sys/dev/ed/if_ed.c
+++ b/sys/dev/ed/if_ed.c
@@ -1323,10 +1323,7 @@ ed_get_packet(struct ed_softc *sc, bus_size_t buf, u_short len)
 	 */
 	if ((len + 2) > MHLEN) {
 		/* Attach an mbuf cluster */
-		MCLGET(m, M_NOWAIT);
-
-		/* Insist on getting a cluster */
-		if ((m->m_flags & M_EXT) == 0) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			return;
 		}
diff --git a/sys/dev/ex/if_ex.c b/sys/dev/ex/if_ex.c
index 4072351..5832168 100644
--- a/sys/dev/ex/if_ex.c
+++ b/sys/dev/ex/if_ex.c
@@ -745,8 +745,7 @@ ex_rx_intr(struct ex_softc *sc)
 
 				while (pkt_len > 0) {
 					if (pkt_len >= MINCLSIZE) {
-						MCLGET(m, M_NOWAIT);
-						if (m->m_flags & M_EXT) {
+						if (MCLGET(m, M_NOWAIT)) {
 							m->m_len = MCLBYTES;
 						} else {
 							m_freem(ipkt);
diff --git a/sys/dev/fe/if_fe.c b/sys/dev/fe/if_fe.c
index 2123dfc..4598b59 100644
--- a/sys/dev/fe/if_fe.c
+++ b/sys/dev/fe/if_fe.c
@@ -1880,8 +1880,7 @@ fe_get_packet (struct fe_softc * sc, u_short len)
 
 	/* Attach a cluster if this packet doesn't fit in a normal mbuf.  */
 	if (len > MHLEN - NFS_MAGIC_OFFSET) {
-		MCLGET(m, M_NOWAIT);
-		if (!(m->m_flags & M_EXT)) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			return -1;
 		}
diff --git a/sys/dev/hifn/hifn7751.c b/sys/dev/hifn/hifn7751.c
index e9d47a1..8330d30 100644
--- a/sys/dev/hifn/hifn7751.c
+++ b/sys/dev/hifn/hifn7751.c
@@ -1890,8 +1890,7 @@ hifn_crypto(
 				goto err_srcmap;
 			}
 			if (totlen >= MINCLSIZE) {
-				MCLGET(m0, M_NOWAIT);
-				if ((m0->m_flags & M_EXT) == 0) {
+				if (!(MCLGET(m0, M_NOWAIT))) {
 					hifnstats.hst_nomem_mcl++;
 					err = sc->sc_cmdu ? ERESTART : ENOMEM;
 					m_freem(m0);
@@ -1913,8 +1912,7 @@ hifn_crypto(
 				}
 				len = MLEN;
 				if (totlen >= MINCLSIZE) {
-					MCLGET(m, M_NOWAIT);
-					if ((m->m_flags & M_EXT) == 0) {
+					if (!(MCLGET(m, M_NOWAIT))) {
 						hifnstats.hst_nomem_mcl++;
 						err = sc->sc_cmdu ? ERESTART : ENOMEM;
 						mlast->m_next = m;
diff --git a/sys/dev/ie/if_ie.c b/sys/dev/ie/if_ie.c
index 72e2559..dc7a868 100644
--- a/sys/dev/ie/if_ie.c
+++ b/sys/dev/ie/if_ie.c
@@ -728,8 +728,7 @@ ieget(struct ie_softc *sc, struct mbuf **mp)
 			m->m_len = MLEN;
 		}
 		if (resid >= MINCLSIZE) {
-			MCLGET(m, M_NOWAIT);
-			if (m->m_flags & M_EXT)
+			if (MCLGET(m, M_NOWAIT))
 				m->m_len = min(resid, MCLBYTES);
 		} else {
 			if (resid < m->m_len) {
diff --git a/sys/dev/le/lance.c b/sys/dev/le/lance.c
index 38be317..2b4202b 100644
--- a/sys/dev/le/lance.c
+++ b/sys/dev/le/lance.c
@@ -398,8 +398,7 @@ lance_get(struct lance_softc *sc, int boff, int totlen)
 
 	while (totlen > 0) {
 		if (totlen >= MINCLSIZE) {
-			MCLGET(m, M_NOWAIT);
-			if ((m->m_flags & M_EXT) == 0)
+			if (!(MCLGET(m, M_NOWAIT)))
 				goto bad;
 			len = MCLBYTES;
 		}
diff --git a/sys/dev/lmc/if_lmc.c b/sys/dev/lmc/if_lmc.c
index 9e1463b..3ca3d3e 100644
--- a/sys/dev/lmc/if_lmc.c
+++ b/sys/dev/lmc/if_lmc.c
@@ -2689,8 +2689,7 @@ rxintr_setup(softc_t *sc)
       printf("%s: rxintr_setup: MGETHDR() failed\n", NAME_UNIT);
     return 0;
     }
-  MCLGET(m, M_NOWAIT);
-  if ((m->m_flags & M_EXT) == 0)
+  if (!(MCLGET(m, M_NOWAIT)))
     {
     m_freem(m);
     sc->status.cntrs.rxdma++;
diff --git a/sys/dev/mn/if_mn.c b/sys/dev/mn/if_mn.c
index 63ae5f6..2f1ea5f 100644
--- a/sys/dev/mn/if_mn.c
+++ b/sys/dev/mn/if_mn.c
@@ -1165,8 +1165,7 @@ mn_rx_intr(struct mn_softc *sc, u_int32_t vector)
 				mn_free_desc(dp);
 				return; /* ENOBUFS */
 			}
-			MCLGET(m, M_NOWAIT);
-			if((m->m_flags & M_EXT) == 0) {
+			if (!(MCLGET(m, M_NOWAIT))) {
 				mn_free_desc(dp);
 				m_freem(m);
 				return; /* ENOBUFS */
diff --git a/sys/dev/my/if_my.c b/sys/dev/my/if_my.c
index e94e9ab..e2430c1 100644
--- a/sys/dev/my/if_my.c
+++ b/sys/dev/my/if_my.c
@@ -1085,8 +1085,7 @@ my_newbuf(struct my_softc * sc, struct my_chain_onefrag * c)
 		    "no memory for rx list -- packet dropped!\n");
 		return (ENOBUFS);
 	}
-	MCLGET(m_new, M_NOWAIT);
-	if (!(m_new->m_flags & M_EXT)) {
+	if (!(MCLGET(m_new, M_NOWAIT))) {
 		device_printf(sc->my_dev,
 		    "no memory for rx list -- packet dropped!\n");
 		m_freem(m_new);
@@ -1352,8 +1351,7 @@ my_encap(struct my_softc * sc, struct my_chain * c, struct mbuf * m_head)
 		return (1);
 	}
 	if (m_head->m_pkthdr.len > MHLEN) {
-		MCLGET(m_new, M_NOWAIT);
-		if (!(m_new->m_flags & M_EXT)) {
+		if (!(MCLGET(m_new, M_NOWAIT))) {
 			m_freem(m_new);
 			device_printf(sc->my_dev, "no memory for tx list");
 			return (1);
diff --git a/sys/dev/pcn/if_pcn.c b/sys/dev/pcn/if_pcn.c
index d3121a1..d63d4aa 100644
--- a/sys/dev/pcn/if_pcn.c
+++ b/sys/dev/pcn/if_pcn.c
@@ -803,8 +803,7 @@ pcn_newbuf(sc, idx, m)
 		if (m_new == NULL)
 			return(ENOBUFS);
 
-		MCLGET(m_new, M_NOWAIT);
-		if (!(m_new->m_flags & M_EXT)) {
+		if (!(MCLGET(m_new, M_NOWAIT))) {
 			m_freem(m_new);
 			return(ENOBUFS);
 		}
diff --git a/sys/dev/pdq/pdq_freebsd.h b/sys/dev/pdq/pdq_freebsd.h
index 78eeef9..a556b36 100644
--- a/sys/dev/pdq/pdq_freebsd.h
+++ b/sys/dev/pdq/pdq_freebsd.h
@@ -190,8 +190,7 @@ typedef struct _pdq_os_ctx_t {
     PDQ_OS_DATABUF_T *x_m0; \
     MGETHDR(x_m0, M_NOWAIT, MT_DATA); \
     if (x_m0 != NULL) { \
-	MCLGET(x_m0, M_NOWAIT);	\
-	if ((x_m0->m_flags & M_EXT) == 0) { \
+	if (!(MCLGET(x_m0, M_NOWAIT))) { \
 	    m_free(x_m0); \
 	    (b) = NULL; \
 	} else { \
diff --git a/sys/dev/pdq/pdq_ifsubr.c b/sys/dev/pdq/pdq_ifsubr.c
index 50619cb..f8df3a7 100644
--- a/sys/dev/pdq/pdq_ifsubr.c
+++ b/sys/dev/pdq/pdq_ifsubr.c
@@ -748,8 +748,7 @@ pdq_os_databuf_alloc(
 	printf("%s: can't alloc small buf\n", sc->sc_dev.dv_xname);
 	return NULL;
     }
-    MCLGET(m, M_NOWAIT);
-    if ((m->m_flags & M_EXT) == 0) {
+    if (!(MCLGET(m, M_NOWAIT))) {
 	printf("%s: can't alloc cluster\n", sc->sc_dev.dv_xname);
         m_free(m);
 	return NULL;
diff --git a/sys/dev/pdq/pdqvar.h b/sys/dev/pdq/pdqvar.h
index 7eb6324..db53273 100644
--- a/sys/dev/pdq/pdqvar.h
+++ b/sys/dev/pdq/pdqvar.h
@@ -216,8 +216,7 @@ typedef struct mbuf PDQ_OS_DATABUF_T;
     PDQ_OS_DATABUF_T *x_m0; \
     MGETHDR(x_m0, M_NOWAIT, MT_DATA); \
     if (x_m0 != NULL) { \
-	MCLGET(x_m0, M_NOWAIT);	\
-	if ((x_m0->m_flags & M_EXT) == 0) { \
+	if (!(MCLGET(x_m0, M_NOWAIT))) { \
 	    m_free(x_m0); \
 	    (b) = NULL; \
 	} else { \
diff --git a/sys/dev/safe/safe.c b/sys/dev/safe/safe.c
index cfd00b6..9b91ed0 100644
--- a/sys/dev/safe/safe.c
+++ b/sys/dev/safe/safe.c
@@ -1328,8 +1328,7 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 					goto errout;
 				}
 				if (totlen >= MINCLSIZE) {
-					MCLGET(m, M_NOWAIT);
-					if ((m->m_flags & M_EXT) == 0) {
+					if (!(MCLGET(m, M_NOWAIT))) {
 						m_free(m);
 						safestats.st_nomcl++;
 						err = sc->sc_nqchip ?
@@ -1355,8 +1354,7 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 						len = MLEN;
 					}
 					if (top && totlen >= MINCLSIZE) {
-						MCLGET(m, M_NOWAIT);
-						if ((m->m_flags & M_EXT) == 0) {
+						if (!(MCLGET(m, M_NOWAIT))) {
 							*mp = m;
 							m_freem(top);
 							safestats.st_nomcl++;
diff --git a/sys/dev/sbni/if_sbni.c b/sys/dev/sbni/if_sbni.c
index c459ded..03200ef 100644
--- a/sys/dev/sbni/if_sbni.c
+++ b/sys/dev/sbni/if_sbni.c
@@ -878,8 +878,7 @@ get_rx_buf(struct sbni_softc *sc)
 	 */
 	if (ETHER_MAX_LEN + 2 > MHLEN) {
 		/* Attach an mbuf cluster */
-		MCLGET(m, M_NOWAIT);
-		if ((m->m_flags & M_EXT) == 0) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			return (0);
 		}
diff --git a/sys/dev/smc/if_smc.c b/sys/dev/smc/if_smc.c
index 8ba7210..af8a5bd 100644
--- a/sys/dev/smc/if_smc.c
+++ b/sys/dev/smc/if_smc.c
@@ -693,8 +693,7 @@ smc_task_rx(void *context, int pending)
 		if (m == NULL) {
 			break;
 		}
-		MCLGET(m, M_NOWAIT);
-		if ((m->m_flags & M_EXT) == 0) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			break;
 		}
diff --git a/sys/dev/sn/if_sn.c b/sys/dev/sn/if_sn.c
index 7350537..26e60bc 100644
--- a/sys/dev/sn/if_sn.c
+++ b/sys/dev/sn/if_sn.c
@@ -1065,14 +1065,9 @@ read_another:
 	m->m_pkthdr.len = m->m_len = packet_length;
 
 	/*
-	 * Attach an mbuf cluster
+	 * Attach an mbuf cluster.
 	 */
-	MCLGET(m, M_NOWAIT);
-
-	/*
-	 * Insist on getting a cluster
-	 */
-	if ((m->m_flags & M_EXT) == 0) {
+	if (!(MCLGET(m, M_NOWAIT))) {
 		m_freem(m);
 		if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 		printf("sn: snread() kernel memory allocation problem\n");
diff --git a/sys/dev/snc/dp83932.c b/sys/dev/snc/dp83932.c
index d4e062a..a496b67 100644
--- a/sys/dev/snc/dp83932.c
+++ b/sys/dev/snc/dp83932.c
@@ -1129,8 +1129,7 @@ sonic_get(struct snc_softc *sc, u_int32_t pkt, int datalen)
 			len = MLEN;
 		}
 		if (datalen >= MINCLSIZE) {
-			MCLGET(m, M_NOWAIT);
-			if ((m->m_flags & M_EXT) == 0) {
+			if (!(MCLGET(m, M_NOWAIT))) {
 				if (top) m_freem(top);
 				return (0);
 			}
diff --git a/sys/dev/ti/if_ti.c b/sys/dev/ti/if_ti.c
index 7d0fc9d..0405020 100644
--- a/sys/dev/ti/if_ti.c
+++ b/sys/dev/ti/if_ti.c
@@ -1596,8 +1596,7 @@ ti_newbuf_jumbo(struct ti_softc *sc, int idx, struct mbuf *m_old)
 			    "failed -- packet dropped!\n");
 			goto nobufs;
 		}
-		MCLGET(m[NPAYLOAD], M_NOWAIT);
-		if ((m[NPAYLOAD]->m_flags & M_EXT) == 0) {
+		if (!(MCLGET(m[NPAYLOAD], M_NOWAIT))) {
 			device_printf(sc->ti_dev, "mbuf allocation failed "
 			    "-- packet dropped!\n");
 			goto nobufs;
diff --git a/sys/dev/tl/if_tl.c b/sys/dev/tl/if_tl.c
index 8535b04..455dd38 100644
--- a/sys/dev/tl/if_tl.c
+++ b/sys/dev/tl/if_tl.c
@@ -1813,8 +1813,7 @@ tl_encap(sc, c, m_head)
 			return(1);
 		}
 		if (m_head->m_pkthdr.len > MHLEN) {
-			MCLGET(m_new, M_NOWAIT);
-			if (!(m_new->m_flags & M_EXT)) {
+			if (!(MCLGET(m_new, M_NOWAIT))) {
 				m_freem(m_new);
 				if_printf(ifp, "no memory for tx list\n");
 				return(1);
diff --git a/sys/dev/usb/misc/udbp.c b/sys/dev/usb/misc/udbp.c
index fc0d850..8140170 100644
--- a/sys/dev/usb/misc/udbp.c
+++ b/sys/dev/usb/misc/udbp.c
@@ -417,9 +417,8 @@ udbp_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 		if (m == NULL) {
 			goto tr_setup;
 		}
-		MCLGET(m, M_NOWAIT);
 
-		if (!(m->m_flags & M_EXT)) {
+		if (!(MCLGET(m, M_NOWAIT))) {
 			m_freem(m);
 			goto tr_setup;
 		}
diff --git a/sys/dev/vx/if_vx.c b/sys/dev/vx/if_vx.c
index 7d852e9..47a6cd9 100644
--- a/sys/dev/vx/if_vx.c
+++ b/sys/dev/vx/if_vx.c
@@ -865,8 +865,7 @@ vx_get(struct vx_softc *sc, u_int totlen)
 			len = MLEN;
 		}
 		if (totlen >= MINCLSIZE) {
-			MCLGET(m, M_NOWAIT);
-			if (m->m_flags & M_EXT)
+			if (MCLGET(m, M_NOWAIT))
 				len = MCLBYTES;
 		}
 		len = min(totlen, len);
diff --git a/sys/dev/wb/if_wb.c b/sys/dev/wb/if_wb.c
index 01090aa..4215d9e 100644
--- a/sys/dev/wb/if_wb.c
+++ b/sys/dev/wb/if_wb.c
@@ -1194,8 +1194,7 @@ wb_encap(sc, c, m_head)
 		if (m_new == NULL)
 			return(1);
 		if (m_head->m_pkthdr.len > MHLEN) {
-			MCLGET(m_new, M_NOWAIT);
-			if (!(m_new->m_flags & M_EXT)) {
+			if (!(MCLGET(m_new, M_NOWAIT))) {
 				m_freem(m_new);
 				return(1);
 			}
diff --git a/sys/dev/xe/if_xe.c b/sys/dev/xe/if_xe.c
index bcde27f..4a7aa6e 100644
--- a/sys/dev/xe/if_xe.c
+++ b/sys/dev/xe/if_xe.c
@@ -765,8 +765,7 @@ xe_rxintr(struct xe_softc *scp, uint8_t rst0)
 			}
 
 			if (len + 3 > MHLEN) {
-				MCLGET(mbp, M_NOWAIT);
-				if ((mbp->m_flags & M_EXT) == 0) {
+				if (!(MCLGET(mbp, M_NOWAIT))) {
 					m_freem(mbp);
 					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 					continue;
diff --git a/sys/dev/xen/netfront/netfront.c b/sys/dev/xen/netfront/netfront.c
index c3c8d92..440c189 100644
--- a/sys/dev/xen/netfront/netfront.c
+++ b/sys/dev/xen/netfront/netfront.c
@@ -822,8 +822,7 @@ network_alloc_rx_buffers(struct netfront_info *sc)
 			goto no_mbuf;
 		}
 
-		m_cljget(m_new, M_NOWAIT, MJUMPAGESIZE);
-		if ((m_new->m_flags & M_EXT) == 0) {
+		if (m_cljget(m_new, M_NOWAIT, MJUMPAGESIZE) == NULL) {
 			printf("%s: m_cljget failed\n", __func__);
 			m_freem(m_new);