linux-kernel - Re: [RESEND PATCH 3/3] infiniband: hns: avoid gcc-7.0.1 warning for uninitialized data

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Message-ID: <1493147943.3041.89.camel@redhat.com>
Date:   Tue, 25 Apr 2017 15:19:03 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Lijun Ou <oulijun@...wei.com>,
        "Wei Hu(Xavier)" <xavier.huwei@...wei.com>,
        Daode Huang <huangdaode@...ilicon.com>,
        Kejian Yan <yankejian@...wei.com>,
        Qianqian Xie <xieqianqian@...wei.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RESEND PATCH 3/3] infiniband: hns: avoid gcc-7.0.1 warning for
 uninitialized data

On Fri, 2017-03-24 at 23:02 +0100, Arnd Bergmann wrote:
> hns_roce_v1_cq_set_ci() calls roce_set_bit() on an uninitialized
> field,
> which will then change only a few of its bits, causing a warning with
> the latest gcc:
> 
> infiniband/hw/hns/hns_roce_hw_v1.c: In function
> 'hns_roce_v1_cq_set_ci':
> infiniband/hw/hns/hns_roce_hw_v1.c:1854:23: error: 'doorbell[1]' is
> used uninitialized in this function [-Werror=uninitialized]
>   roce_set_bit(doorbell[1], ROCEE_DB_OTHERS_H_ROCEE_DB_OTH_HW_SYNS_S,
> 1);
> 
> The code is actually correct since we always set all bits of the
> port_vlan field, but gcc correctly points out that the first
> access does contain uninitialized data.
> 
> This initializes the field to zero first before setting the
> individual bits.
> 
> Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, applied.

-- 
Doug Ledford <dledford@...hat.com>
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