Re: [dpdk-dev] [PATCH] ixgbe: fix build with gcc 4.4

[Vlad Zolotarov <vladz@cloudius-systems.com>]

On 04/14/15 12:31, Thomas Monjalon wrote:
> With GCC 4.4.7 from CentOS 6.5, the following errors arise:
>
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c: In function ‘ixgbe_dev_rx_queue_setup’:
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:2509: error: missing initializer
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:2509: error: (near initialization for ‘dev_info.driver_name’)
>
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c: In function ‘ixgbe_set_rsc’:
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:4072: error: missing initializer
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:4072: error: (near initialization for ‘dev_info.driver_name’)
>
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c: In function ‘ixgbe_recv_pkts_lro_single_alloc’:
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:1479: error: ‘next_rsc_entry’ may be used uninitialized in this function
> lib/librte_pmd_ixgbe/ixgbe_rxtx.c:1480: error: ‘next_rxe’ may be used uninitialized in this function

:D Looks like a gcc bug ;) Both are set and only after that (!!!) used 
under "!eop" condition.

>
> Fixes: 8eecb3295aed ("ixgbe: add LRO support")
>
> Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
> ---
>   lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> index f1da9ec..a2b8631 100644
> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> @@ -1476,8 +1476,8 @@ ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts,
>   		bool eop;
>   		struct ixgbe_rx_entry *rxe;
>   		struct ixgbe_rsc_entry *rsc_entry;
> -		struct ixgbe_rsc_entry *next_rsc_entry;
> -		struct ixgbe_rx_entry *next_rxe;
> +		struct ixgbe_rsc_entry *next_rsc_entry = NULL;
> +		struct ixgbe_rx_entry *next_rxe = NULL;
>   		struct rte_mbuf *first_seg;
>   		struct rte_mbuf *rxm;
>   		struct rte_mbuf *nmb;
> @@ -2506,7 +2506,7 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
>   	struct ixgbe_rx_queue *rxq;
>   	struct ixgbe_hw     *hw;
>   	uint16_t len;
> -	struct rte_eth_dev_info dev_info = { 0 };
> +	struct rte_eth_dev_info dev_info = { .max_rx_queues = 0 };
>   	struct rte_eth_rxmode *dev_rx_mode = &dev->data->dev_conf.rxmode;
>   	bool rsc_requested = false;
>   
> @@ -4069,7 +4069,7 @@ ixgbe_set_rsc(struct rte_eth_dev *dev)
>   {
>   	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
>   	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> -	struct rte_eth_dev_info dev_info = { 0 };
> +	struct rte_eth_dev_info dev_info = { .max_rx_queues = 0 };
>   	bool rsc_capable = false;
>   	uint16_t i;
>   	uint32_t rdrxctl;