From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Cc: Maciej Czekaj <maciej.czekaj@caviumnetworks.com>,
dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] net/thunderx: fix build with gcc optimization on
Date: Tue, 26 Jun 2018 10:17:14 +0100 [thread overview]
Message-ID: <609412c8-26c2-5263-5f6d-7e888228b885@intel.com> (raw)
In-Reply-To: <20180624121723.GA7776@jerin>
On 6/24/2018 1:17 PM, Jerin Jacob wrote:
> -----Original Message-----
>> Date: Thu, 21 Jun 2018 19:14:50 +0100
>> From: Ferruh Yigit <ferruh.yigit@intel.com>
>> To: Jerin Jacob <jerin.jacob@caviumnetworks.com>, Maciej Czekaj
>> <maciej.czekaj@caviumnetworks.com>
>> CC: dev@dpdk.org, Ferruh Yigit <ferruh.yigit@intel.com>, stable@dpdk.org
>> Subject: [PATCH] net/thunderx: fix build with gcc optimization on
>> X-Mailer: git-send-email 2.17.1
>>
>>
>> build error gcc version 6.3.1 20161221 (Red Hat 6.3.1-1),
>> with EXTRA_CFLAGS="-O3":
>>
>> .../drivers/net/thunderx/nicvf_ethdev.c:907:9:
>> error: ‘txq’ may be used uninitialized in this function
>> [-Werror=maybe-uninitialized]
>> if (txq->pool_free == nicvf_single_pool_free_xmited_buffers)
>> ~~~^~~~~~~~~~~
>> .../drivers/net/thunderx/nicvf_ethdev.c:886:20:
>> note: ‘txq’ was declared here
>> struct nicvf_txq *txq;
>> ^~~
>>
>> Same error on function 'nicvf_eth_dev_init' and 'nicvf_dev_start', it
>> seems 'nicvf_set_tx_function' inlined when optimization enabled.
>>
>> Initialize the txq and add NULL check before using it to fix.
>>
>> Fixes: 7413feee662d ("net/thunderx: add device start/stop and close")
>> Cc: stable@dpdk.org
>>
>> Reported-by: Richard Walsh <richard.walsh@intel.com>
>> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
>
> Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
>
>> ---
>>
>> Btw, no compiler optimization enabled, only nicvf_rxtx.c has -Ofast,
>> is this intentional?
>
> Yes. At least in our setup, -Ofast turns out to be super set of -O3.
That is what gcc documents about -Ofast, but again it is only for single
nicvf_rxtx.c file. The problem seen with -O3 case with other file.
next prev parent reply other threads:[~2018-06-26 9:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-21 18:14 Ferruh Yigit
2018-06-24 12:17 ` Jerin Jacob
2018-06-26 9:17 ` Ferruh Yigit [this message]
2018-06-26 9:52 ` Jerin Jacob
2018-06-26 17:10 ` Ferruh Yigit
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