[tip:locking/core 19/28] include/linux/fs.h:1422:29: error: array type has incomplete element type 'struct percpu_rw_semaphore'

* [tip:locking/core 19/28] include/linux/fs.h:1422:29: error: array type has incomplete element type 'struct percpu_rw_semaphore'
@ 2020-03-21 18:11 kbuild test robot
  2020-03-21 19:28 ` Thomas Gleixner
  0 siblings, 1 reply; 4+ messages in thread
From: kbuild test robot @ 2020-03-21 18:11 UTC (permalink / raw)
  To: Peter Zijlstra (Intel); +Cc: kbuild-all, linux-kernel, x86, Thomas Gleixner

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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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