linux-kernel - Re: linux-next: build warning after merge of the rdma tree

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Date:   Mon, 14 May 2018 12:03:26 -0600
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Doug Ledford <dledford@...hat.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steve Wise <swise@...ngridcomputing.com>
Subject: Re: linux-next: build warning after merge of the rdma tree

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