[arnd-playground:headers-clean-test 21/30] include/linux/spinlock.h:449:28: error: static declaration of 'spin_is_contended' follows non-static declaration

[arnd-playground:headers-clean-test 21/30] include/linux/spinlock.h:449:28: error: static declaration of 'spin_is_contended' follows non-static declaration

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git headers-clean-test
head:   a25b75e508f3199f82d682ff1c5d6968d3286581
commit: 7cb3907a92dcc34da3c9242d72ca7ce2a2313817 [21/30] fixup
config: arc-defconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 7cb3907a92dcc34da3c9242d72ca7ce2a2313817
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

In file included from arch/arc/kernel/asm-offsets.c:6:
include/linux/sched.h: In function 'spin_needbreak':
include/linux/sched.h:1862:9: error: implicit declaration of function 'spin_is_contended' [-Werror=implicit-function-declaration]
1862 |  return spin_is_contended(lock);
|         ^~~~~~~~~~~~~~~~~
In file included from include/linux/mmzone.h:8,
from include/linux/mm.h:13,
from arch/arc/kernel/asm-offsets.c:7:
include/linux/spinlock.h: At top level:
>> include/linux/spinlock.h:449:28: error: static declaration of 'spin_is_contended' follows non-static declaration
449 | static __always_inline int spin_is_contended(spinlock_t *lock)
|                            ^~~~~~~~~~~~~~~~~
In file included from arch/arc/kernel/asm-offsets.c:6:
include/linux/sched.h:1862:9: note: previous implicit declaration of 'spin_is_contended' was here
1862 |  return spin_is_contended(lock);
|         ^~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:110: arch/arc/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1177: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:185: __sub-make] Error 2

vim +/spin_is_contended +449 include/linux/spinlock.h

c2f21ce2e31286 Thomas Gleixner 2009-12-02  448  
3490565b633c70 Denys Vlasenko  2015-07-13 @449  static __always_inline int spin_is_contended(spinlock_t *lock)
c2f21ce2e31286 Thomas Gleixner 2009-12-02  450  {
c2f21ce2e31286 Thomas Gleixner 2009-12-02  451  	return raw_spin_is_contended(&lock->rlock);
c2f21ce2e31286 Thomas Gleixner 2009-12-02  452  }
c2f21ce2e31286 Thomas Gleixner 2009-12-02  453  

:::::: The code at line 449 was first introduced by commit
:::::: 3490565b633c705d2fb1f6ede51228952664663d locking/spinlocks: Force inlining of spinlock ops

:::::: TO: Denys Vlasenko <dvlasenk@redhat.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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

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