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Date:   Mon, 8 Jul 2019 13:03:51 +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>,
        Bernard Metzler <bmt@...ich.ibm.com>
Subject: linux-next: build failure after merge of the rdma tree

Hi all,

After merging the rdma tree, today's linux-next build (x86_64
allmodconfig) failed like this:

In file included from include/asm-generic/percpu.h:7,
                 from arch/x86/include/asm/percpu.h:544,
                 from arch/x86/include/asm/preempt.h:6,
                 from include/linux/preempt.h:78,
                 from include/linux/spinlock.h:51,
                 from include/linux/seqlock.h:36,
                 from include/linux/time.h:6,
                 from include/linux/ktime.h:24,
                 from include/linux/timer.h:6,
                 from include/linux/netdevice.h:24,
                 from drivers/infiniband/sw/siw/siw_main.c:8:
include/linux/percpu-defs.h:92:33: warning: '__pcpu_unique_use_cnt' initialized and declared 'extern'
  extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                 ^~~~~~~~~~~~~~
include/linux/percpu-defs.h:115:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
  DEFINE_PER_CPU_SECTION(type, name, "")
  ^~~~~~~~~~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~
include/linux/percpu-defs.h:93:26: error: redefinition of '__pcpu_unique_use_cnt'
  __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;   \
                          ^~~~~~~~~~~~~~
include/linux/percpu-defs.h:115:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
  DEFINE_PER_CPU_SECTION(type, name, "")
  ^~~~~~~~~~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~
include/linux/percpu-defs.h:92:33: note: previous definition of '__pcpu_unique_use_cnt' was here
  extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                 ^~~~~~~~~~~~~~
include/linux/percpu-defs.h:115:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
  DEFINE_PER_CPU_SECTION(type, name, "")
  ^~~~~~~~~~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:33: warning: 'use_cnt' initialized and declared 'extern'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
                                 ^~~~~~~
include/linux/percpu-defs.h:94:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
  extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                            ^~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:33: error: redefinition of 'use_cnt'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
                                 ^~~~~~~
include/linux/percpu-defs.h:95:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
  __PCPU_ATTRS(sec) __weak __typeof__(type) name
                                            ^~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~
drivers/infiniband/sw/siw/siw_main.c:129:33: note: previous definition of 'use_cnt' was here
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
                                 ^~~~~~~
include/linux/percpu-defs.h:94:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
  extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                            ^~~~
drivers/infiniband/sw/siw/siw_main.c:129:8: note: in expansion of macro 'DEFINE_PER_CPU'
 static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
        ^~~~~~~~~~~~~~

Caused by commit

  bdcf26bf9b3a ("rdma/siw: network and RDMA core interface")

I have used the rdma tree from 20190628 again today.

-- 
Cheers,
Stephen Rothwell

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