From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Rothwell <sfr@canb.auug.org.au>
Subject: linux-next: build warnings after merge of the rdma tree
Date: Tue, 10 Jul 2018 11:33:42 +1000
Message-ID: <20180710113342.605e53e8@canb.auug.org.au>
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To: Doug Ledford <dledford@redhat.com>, Jason Gunthorpe <jgg@mellanox.com>
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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 us=
ed 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 decl=
ared 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 u=
sed 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 dec=
lared 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 uniniti=
alized 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.

--=20
Cheers,
Stephen Rothwell

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