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Subjectlinux-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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