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

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Date:   Tue, 10 Jul 2018 11:33:42 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bart Van Assche <bart.vanassche@....com>
Subject: linux-next: build warnings after merge of the rdma tree

Hi all,

After merging the rdma tree, today's linux-next build (x86_64
allmodconfig) produced these warnings:

In file included from include/linux/printk.h:336:0,
                 from include/linux/kernel.h:14,
                 from arch/x86/include/asm/percpu.h:45,
                 from arch/x86/include/asm/current.h:6,
                 from include/linux/mutex.h:14,
                 from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34,
                 from drivers/infiniband/hw/cxgb4/cq.c:33:
drivers/infiniband/hw/cxgb4/cq.c: In function '__c4iw_poll_cq_one':
include/linux/dynamic_debug.h:127:3: warning: 'cqe.u.gen.wrid_hi' may be used uninitialized in this function [-Wmaybe-uninitialized]
   __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
   ^~~~~~~~~~~~~~~~~~
drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.u.gen.wrid_hi' was declared here
  struct t4_cqe cqe;
                ^~~
In file included from include/linux/printk.h:336:0,
                 from include/linux/kernel.h:14,
                 from arch/x86/include/asm/percpu.h:45,
                 from arch/x86/include/asm/current.h:6,
                 from include/linux/mutex.h:14,
                 from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34,
                 from drivers/infiniband/hw/cxgb4/cq.c:33:
include/linux/dynamic_debug.h:127:3: warning: 'cqe.u.gen.wrid_low' may be used uninitialized in this function [-Wmaybe-uninitialized]
   __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
   ^~~~~~~~~~~~~~~~~~
drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.u.gen.wrid_low' was declared here
  struct t4_cqe cqe;
                ^~~
In file included from include/linux/printk.h:336:0,
                 from include/linux/kernel.h:14,
                 from arch/x86/include/asm/percpu.h:45,
                 from arch/x86/include/asm/current.h:6,
                 from include/linux/mutex.h:14,
                 from drivers/infiniband/hw/cxgb4/iw_cxgb4.h:34,
                 from drivers/infiniband/hw/cxgb4/cq.c:33:
include/linux/dynamic_debug.h:127:3: warning: 'cqe.len' may be used uninitialized in this function [-Wmaybe-uninitialized]
   __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
   ^~~~~~~~~~~~~~~~~~
drivers/infiniband/hw/cxgb4/cq.c:674:16: note: 'cqe.len' was declared here
  struct t4_cqe cqe;
                ^~~

Introduced by commit

  4ab39e2f98f2 ("RDMA/cxgb4: Make c4iw_poll_cq_one() easier to analyze")

Again, I can't easily tell if these are false positives or not.

-- 
Cheers,
Stephen Rothwell

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