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Date:   Tue, 29 Dec 2020 11:28:26 +0800
From:   kernel test robot <>
To:     "Paul E. McKenney" <>
Subject: [rcu:dev.2020.12.15b 130/134] include/linux/stddef.h:8:14: error:
 called object is not a function or function pointer

tree: dev.2020.12.15b
head:   f895a17eec290b0038a6294d884a9cc92d7d6e80
commit: 7655dc620982c6505386efdaf975e6bde3c27afb [130/134] rcu-tasks: Use NULL pointer instead of empty show_rcu_tasks_*() functions
config: ia64-randconfig-r012-20201217 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add rcu
        git fetch --no-tags rcu dev.2020.12.15b
        git checkout 7655dc620982c6505386efdaf975e6bde3c27afb
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:154,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from arch/ia64/include/asm/sections.h:11,
                    from include/linux/interrupt.h:20,
                    from kernel/rcu/update.c:25:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:137:41: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     137 |  unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                         ^~~~~~~
   In file included from include/uapi/linux/posix_types.h:5,
                    from include/uapi/linux/types.h:14,
                    from include/linux/types.h:6,
                    from kernel/rcu/update.c:20:
   kernel/rcu/tasks.h: In function 'show_rcu_tasks_gp_kthreads':
>> include/linux/stddef.h:8:14: error: called object is not a function or function pointer
       8 | #define NULL ((void *)0)
         |              ^
   kernel/rcu/rcu.h:554:40: note: in expansion of macro 'NULL'
     554 | #define show_rcu_tasks_rude_gp_kthread NULL
         |                                        ^~~~
   kernel/rcu/tasks.h:1222:2: note: in expansion of macro 'show_rcu_tasks_rude_gp_kthread'
    1222 |  show_rcu_tasks_rude_gp_kthread();
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/stddef.h:8:14: error: called object is not a function or function pointer
       8 | #define NULL ((void *)0)
         |              ^
   kernel/rcu/rcu.h:559:41: note: in expansion of macro 'NULL'
     559 | #define show_rcu_tasks_trace_gp_kthread NULL
         |                                         ^~~~
   kernel/rcu/tasks.h:1223:2: note: in expansion of macro 'show_rcu_tasks_trace_gp_kthread'
    1223 |  show_rcu_tasks_trace_gp_kthread();
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +8 include/linux/stddef.h

^1da177e4c3f415 Linus Torvalds   2005-04-16  6  
^1da177e4c3f415 Linus Torvalds   2005-04-16  7  #undef NULL
^1da177e4c3f415 Linus Torvalds   2005-04-16 @8  #define NULL ((void *)0)
6e2182874324727 Richard Knutsson 2006-09-30  9  

:::::: The code at line 8 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <>
:::::: CC: Linus Torvalds <>

0-DAY CI Kernel Test Service, Intel Corporation

Download attachment ".config.gz" of type "application/gzip" (37568 bytes)

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