[dpdk-dev] [PATCH v4] Fixes following error on gcc 4.4.7:

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

make: Entering directory `/tmp/dpdk-tmp/examples/vhost'
  CC main.o
cc1: warnings being treated as errors
/tmp/dpdk-tmp/examples/vhost/main.c: In function ‘new_device’:
/tmp/dpdk-tmp/x86_64-native-linuxapp-gcc/include/rte_ring.h:740: error:
    dereferencing pointer ‘mbuf.486’ does break strict-aliasing rules
/tmp/dpdk-tmp/examples/vhost/main.c:1503: note: initialized from here
...
/tmp/dpdk-tmp/examples/vhost/main.c:1503: note: initialized from here
/tmp/dpdk-tmp/x86_64-native-linuxapp-gcc/include/rte_ring.h:740: error:
    dereferencing pointer ‘({anonymous})’ does break strict-aliasing rules
/tmp/dpdk-tmp/examples/vhost/main.c:1804: note: initialized from here
make[1]: *** [main.o] Error 1

Fixes: d19533e8 ("examples/vhost: copy old vhost example")

Reported-by: Qian Xu <qian.q.xu@intel.com>
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
Changes in v4:
- Simplify patch, just casting to void *, without using new variables

Changes in v3:
- Remove even more unnecessary castings

Changes in v2:
- Remove unnecessary casting

 examples/vhost/main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index dc3a012..f3c50c5 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -1500,7 +1500,7 @@ attach_rxmbuf_zcp(struct virtio_net *dev)
 		}
 	} while (unlikely(phys_addr == 0));
 
-	rte_ring_sc_dequeue(vpool->ring, (void **)&mbuf);
+	rte_ring_sc_dequeue(vpool->ring, (void *)mbuf);
 	if (unlikely(mbuf == NULL)) {
 		LOG_DEBUG(VHOST_DATA,
 			"(%"PRIu64") in attach_rxmbuf_zcp: "
@@ -1801,7 +1801,7 @@ virtio_tx_route_zcp(struct virtio_net *dev, struct rte_mbuf *m,
 
 	/* Allocate an mbuf and populate the structure. */
 	vpool = &vpool_array[MAX_QUEUES + vmdq_rx_q];
-	rte_ring_sc_dequeue(vpool->ring, (void **)&mbuf);
+	rte_ring_sc_dequeue(vpool->ring, (void *)mbuf);
 	if (unlikely(mbuf == NULL)) {
 		struct vhost_virtqueue *vq = dev->virtqueue[VIRTIO_TXQ];
 		RTE_LOG(ERR, VHOST_DATA,
-- 
2.5.0