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Subject[tip:locking/core 19/28] include/linux/fs.h:1422:29: error: array type has incomplete element type 'struct percpu_rw_semaphore'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core
head: d53f2b62fcb63f6547c10d8c62bca19e957b0eef
commit: 80fbaf1c3f2926c834f8ca915441dfe27ce5487e [19/28] rcuwait: Add @state argument to rcuwait_wait_event()
config: m68k-m5275evb_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 80fbaf1c3f2926c834f8ca915441dfe27ce5487e
# save the attached .config to linux build tree
GCC_VERSION=9.2.0 make.cross ARCH=m68k

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

In file included from include/linux/huge_mm.h:8,
from include/linux/mm.h:567,
from arch/m68k/include/asm/uaccess_no.h:8,
from arch/m68k/include/asm/uaccess.h:3,
from include/linux/uaccess.h:11,
from include/linux/sched/task.h:11,
from include/linux/sched/signal.h:9,
from include/linux/rcuwait.h:6,
from include/linux/percpu-rwsem.h:7,
from kernel/locking/percpu-rwsem.c:6:
>> include/linux/fs.h:1422:29: error: array type has incomplete element type 'struct percpu_rw_semaphore'
1422 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
| ^~~~~~

vim +1422 include/linux/fs.h

5accdf82ba25ca Jan Kara 2012-06-12 1418
5accdf82ba25ca Jan Kara 2012-06-12 1419 struct sb_writers {
5accdf82ba25ca Jan Kara 2012-06-12 1420 int frozen; /* Is sb frozen? */
8129ed29644bf5 Oleg Nesterov 2015-08-11 1421 wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */
8129ed29644bf5 Oleg Nesterov 2015-08-11 @1422 struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS];
5accdf82ba25ca Jan Kara 2012-06-12 1423 };
5accdf82ba25ca Jan Kara 2012-06-12 1424

:::::: The code at line 1422 was first introduced by commit
:::::: 8129ed29644bf56ed17ec1bbbeed5c568b43d6a0 change sb_writers to use percpu_rw_semaphore

:::::: TO: Oleg Nesterov <oleg@redhat.com>
:::::: CC: Oleg Nesterov <oleg@redhat.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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