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Subject: Re: linux-next: build warning after merge of the rdma tree
From:   Steve Wise <swise@opengridcomputing.com>
To:     Jason Gunthorpe <jgg@mellanox.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Doug Ledford <dledford@redhat.com>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <20180507094454.4a71f8a2@canb.auug.org.au>
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 <2c3cedda-da0c-8a7a-e950-7d32c02af95f@opengridcomputing.com>
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Message-ID: <ce892196-8690-7ec6-4727-efb3f03d311e@opengridcomputing.com>
Date:   Mon, 14 May 2018 15:29:37 -0500
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On 5/14/2018 1:09 PM, Steve Wise wrote:
>
> On 5/14/2018 1:03 PM, Jason Gunthorpe wrote:
>> On Mon, May 07, 2018 at 09:44:54AM +1000, Stephen Rothwell wrote:
>>> Hi all,
>>>
>>> After merging the rdma tree, today's linux-next build (x86_64
>>> allmodconfig) produced this warning:
>>>
>>> drivers/infiniband/hw/cxgb4/restrack.c: In function 'fill_res_qp_entry':
>>> drivers/infiniband/hw/cxgb4/restrack.c:140:6: warning: 'last_rq_idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>>   if (rdma_nl_put_driver_u32(msg, "idx", idx))
>>>       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> drivers/infiniband/hw/cxgb4/restrack.c:180:20: note: 'last_rq_idx' was declared here
>>>   u16 first_rq_idx, last_rq_idx;
>>>                     ^~~~~~~~~~~
>>> drivers/infiniband/hw/cxgb4/restrack.c:140:6: warning: 'first_rq_idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>>   if (rdma_nl_put_driver_u32(msg, "idx", idx))
>>>       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> drivers/infiniband/hw/cxgb4/restrack.c:180:6: note: 'first_rq_idx' was declared here
>>>   u16 first_rq_idx, last_rq_idx;
>>>       ^~~~~~~~~~~~
>>> drivers/infiniband/hw/cxgb4/restrack.c:228:6: warning: 'last_sq_idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>>   if (fill_swsqes(msg, &wq.sq, first_sq_idx, fsp, last_sq_idx, lsp))
>>>       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> drivers/infiniband/hw/cxgb4/restrack.c:228:6: warning: 'first_sq_idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>>
>>> Introduced by commit
>>>
>>>   056f9c7f39bf ("iw_cxgb4: dump detailed driver-specific QP information")
>>>
>> SteveW, is there a patch to fix this that I'm missing?
>>
>> Thanks,
>> Jason
> Hey Jason, 
>
> I'll send you one shortly. 
>
> Steve.
>

Posted:  https://patchwork.kernel.org/patch/10399081/

Steve.