Re: [dpdk-dev] [PATCH v2 1/2] net/avp: fix gcc 10 maybe-uninitialized warning

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 3/11/2020 11:32 AM, Kevin Traynor wrote:
> gcc 10.0.1 reports:
> 
> ../drivers/net/avp/avp_ethdev.c: In function ‘avp_xmit_scattered_pkts’:
> ../drivers/net/avp/avp_ethdev.c:1791:24:
> warning: ‘avp_bufs[count]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>  1791 |   tx_bufs[i] = avp_bufs[count];
>       |                ~~~~~~~~^~~~~~~
> ../drivers/net/avp/avp_ethdev.c:1791:24:
> warning: ‘avp_bufs[count]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> Fix by intializing the array.
> 
> Fixes: 295abce2d25b ("net/avp: add packet transmit functions")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
> ---
> v2: no change
> 
> note, commit log violates line length but I didn't want to split warning msg.
> 
> Cc: allain.legacy@windriver.com
> Cc: Steven Webster <steven.webster@windriver.com>
> Cc: Matt Peters <matt.peters@windriver.com>
> ---
>  drivers/net/avp/avp_ethdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/avp/avp_ethdev.c b/drivers/net/avp/avp_ethdev.c
> index cd747b6be..1abe96ce5 100644
> --- a/drivers/net/avp/avp_ethdev.c
> +++ b/drivers/net/avp/avp_ethdev.c
> @@ -1695,5 +1695,5 @@ avp_xmit_scattered_pkts(void *tx_queue,
>  {
>  	struct rte_avp_desc *avp_bufs[(AVP_MAX_TX_BURST *
> -				       RTE_AVP_MAX_MBUF_SEGMENTS)];
> +				       RTE_AVP_MAX_MBUF_SEGMENTS)] = {};
>  	struct avp_queue *txq = (struct avp_queue *)tx_queue;
>  	struct rte_avp_desc *tx_bufs[AVP_MAX_TX_BURST];
> 

Isn't this a false positive, can there be any case 'avp_bufs[]' used
uninitialized? Or am I missing something.

If this is false positive, does it worth to report to issue to gcc?