arch/mips/loongson64/cop2-ex.c:32:15: error: implicit declaration of function '__is_fpu_owner'; did you mean 'is_fpu_owner'?

[kbuild test robot]

Hi Jiaxun,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   46cf053efec6a3a5f343fead837777efe8252a46
commit: 6fbde6b492dfc761ad60a68fb2cb32b1eb05b786 MIPS: Loongson64: Move files to the top-level directory
date:   8 weeks ago
config: mips-randconfig-a001-20191226 (attached as .config)
compiler: mips64el-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6fbde6b492dfc761ad60a68fb2cb32b1eb05b786
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=mips 

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

All errors (new ones prefixed by >>):

   arch/mips/loongson64/cop2-ex.c: In function 'loongson_cu2_call':
>> arch/mips/loongson64/cop2-ex.c:32:15: error: implicit declaration of function '__is_fpu_owner'; did you mean 'is_fpu_owner'? [-Werror=implicit-function-declaration]
      fpu_owned = __is_fpu_owner();
                  ^~~~~~~~~~~~~~
                  is_fpu_owner
>> arch/mips/loongson64/cop2-ex.c:47:4: error: call to '_restore_fp' declared with attribute error: _restore_fp() should not be called when CONFIG_MIPS_FP_SUPPORT=n
       _restore_fp(current);
       ^~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +32 arch/mips/loongson64/cop2-ex.c

ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  22  
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  23  static int loongson_cu2_call(struct notifier_block *nfb, unsigned long action,
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  24  	void *data)
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  25  {
bfcdf130636195 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-08-11  26  	int fpu_owned;
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  27  	int fr = !test_thread_flag(TIF_32BIT_FPREGS);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  28  
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  29  	switch (action) {
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  30  	case CU2_EXCEPTION:
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  31  		preempt_disable();
bfcdf130636195 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-08-11 @32  		fpu_owned = __is_fpu_owner();
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  33  		if (!fr)
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  34  			set_c0_status(ST0_CU1 | ST0_CU2);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  35  		else
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  36  			set_c0_status(ST0_CU1 | ST0_CU2 | ST0_FR);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  37  		enable_fpu_hazard();
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  38  		KSTK_STATUS(current) |= (ST0_CU1 | ST0_CU2);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  39  		if (fr)
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  40  			KSTK_STATUS(current) |= ST0_FR;
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  41  		else
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  42  			KSTK_STATUS(current) &= ~ST0_FR;
bfcdf130636195 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-08-11  43  		/* If FPU is owned, we needn't init or restore fp */
bfcdf130636195 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-08-11  44  		if (!fpu_owned) {
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  45  			set_thread_flag(TIF_USEDFPU);
cc97ab235f3fe3 arch/mips/loongson64/loongson-3/cop2-ex.c Paul Burton 2018-11-07  46  			init_fp_ctx(current);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26 @47  			_restore_fp(current);
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  48  		}
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  49  		preempt_enable();
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  50  
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  51  		return NOTIFY_STOP;	/* Don't call default notifier */
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  52  	}
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  53  
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  54  	return NOTIFY_OK;		/* Let default notifier send signals */
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  55  }
ef2f826c8f2ff1 arch/mips/loongson/loongson-3/cop2-ex.c   Huacai Chen 2014-06-26  56  

:::::: The code at line 32 was first introduced by commit
:::::: bfcdf1306361951b104c6858d07f6778b53e4368 MIPS: Loongson: Fix COP2 usage for preemptible kernel

:::::: TO: Huacai Chen <chenhc@xxxxxxxxxx>
:::::: CC: Ralf Baechle <ralf@xxxxxxxxxxxxxx>

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0-DAY kernel test infrastructure                 Open Source Technology Center
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