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From: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
To: dev@dpdk.org
Cc: Ferruh Yigit <ferruh.yigit@intel.com>,
Adrien Mazarguil <adrien.mazarguil@6wind.com>
Date: Wed, 22 Jun 2016 11:05:52 +0200
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Subject: [dpdk-dev] [PATCH v4 22/25] mlx5: work around spurious compilation
errors
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From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Since commit "mlx5: resurrect Tx gather support", older GCC versions (such
as 4.8.5) may complain about the following:
mlx5_rxtx.c: In function `mlx5_tx_burst':
mlx5_rxtx.c:705:25: error: `wqe' may be used uninitialized in this
function [-Werror=maybe-uninitialized]
mlx5_rxtx.c: In function `mlx5_tx_burst_inline':
mlx5_rxtx.c:864:25: error: `wqe' may be used uninitialized in this
function [-Werror=maybe-uninitialized]
In both cases, this code cannot be reached when wqe is not initialized.
Considering older GCC versions are still widely used, work around this
issue by initializing wqe preemptively, even if it should not be necessary.
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
drivers/net/mlx5/mlx5_rxtx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index db784c0..2fc57dc 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -591,7 +591,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
unsigned int j = 0;
unsigned int max;
unsigned int comp;
- volatile union mlx5_wqe *wqe;
+ volatile union mlx5_wqe *wqe = NULL;
if (unlikely(!pkts_n))
return 0;
@@ -733,7 +733,7 @@ mlx5_tx_burst_inline(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
unsigned int j = 0;
unsigned int max;
unsigned int comp;
- volatile union mlx5_wqe *wqe;
+ volatile union mlx5_wqe *wqe = NULL;
unsigned int max_inline = txq->max_inline;
if (unlikely(!pkts_n))
--
2.1.4