tree:   https://github.com/hnaz/linux-mm master
head:   5d9ee416b5701096536c7a63c04dbe25012baa9e
commit: 76e15e67350bfb1e0b1b151255c1d0b075143424 [95/340] mm: return faster for non-fatal signals in user mode faults
config: mips-allyesconfig (attached as .config)
compiler: mips-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 76e15e67350bfb1e0b1b151255c1d0b075143424
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=mips 

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/init.h:5,
                    from sound/core/hwdep.c:8:
   include/linux/sched/signal.h: In function 'fault_signal_pending':
>> include/linux/sched/signal.h:383:6: error: implicit declaration of function 'user_mode'; did you mean 'user_sd'? [-Werror=implicit-function-declaration]
     383 |     (user_mode(regs) && signal_pending(current))));
         |      ^~~~~~~~~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   cc1: some warnings being treated as errors

vim +383 include/linux/sched/signal.h

   371	
   372	/*
   373	 * This should only be used in fault handlers to decide whether we
   374	 * should stop the current fault routine to handle the signals
   375	 * instead, especially with the case where we've got interrupted with
   376	 * a VM_FAULT_RETRY.
   377	 */
   378	static inline bool fault_signal_pending(unsigned int fault_flags,
   379						struct pt_regs *regs)
   380	{
   381		return unlikely((fault_flags & VM_FAULT_RETRY) &&
   382				(fatal_signal_pending(current) ||
 > 383				 (user_mode(regs) && signal_pending(current))));
   384	}
   385	

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