[linux-next:master 1017/5794] include/asm-generic/mmu_context.h:60:2: error: implicit declaration of function 'switch_mm'

* [linux-next:master 1017/5794] include/asm-generic/mmu_context.h:60:2: error: implicit declaration of function 'switch_mm'
@ 2020-11-14  4:51 ` kernel test robot
  0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2020-11-14  4:51 UTC (permalink / raw)
  To: Nicholas Piggin; +Cc: kbuild-all, Linux Memory Management List, Arnd Bergmann

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   92edc4aef86780a8ad01b092c6d6630bb3cb423d
commit: 94f89922e1e094f57a143965059a3e477f3f2fdc [1017/5794] asm-generic: add generic MMU versions of mmu context functions
config: h8300-randconfig-r036-20201113 (attached as .config)
compiler: h8300-linux-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=94f89922e1e094f57a143965059a3e477f3f2fdc
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 94f89922e1e094f57a143965059a3e477f3f2fdc
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 

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

All errors (new ones prefixed by >>):

   In file included from ./arch/h8300/include/generated/asm/mmu_context.h:1,
                    from include/linux/mmu_context.h:5,
                    from kernel/sched/sched.h:54,
                    from kernel/sched/core.c:13:
   include/asm-generic/mmu_context.h: In function 'activate_mm':
>> include/asm-generic/mmu_context.h:60:2: error: implicit declaration of function 'switch_mm' [-Werror=implicit-function-declaration]
      60 |  switch_mm(prev_mm, next_mm, current);
         |  ^~~~~~~~~
   kernel/sched/core.c: In function 'ttwu_stat':
   kernel/sched/core.c:2419:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable]
    2419 |  struct rq *rq;
         |             ^~
   cc1: some warnings being treated as errors
--
   In file included from ./arch/h8300/include/generated/asm/mmu_context.h:1,
                    from include/linux/mmu_context.h:5,
                    from kernel/sched/sched.h:54,
                    from kernel/sched/loadavg.c:9:
   include/asm-generic/mmu_context.h: In function 'activate_mm':
>> include/asm-generic/mmu_context.h:60:2: error: implicit declaration of function 'switch_mm' [-Werror=implicit-function-declaration]
      60 |  switch_mm(prev_mm, next_mm, current);
         |  ^~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from ./arch/h8300/include/generated/asm/mmu_context.h:1,
                    from include/linux/mmu_context.h:5,
                    from kernel/sched/sched.h:54,
                    from kernel/sched/rt.c:6:
   include/asm-generic/mmu_context.h: In function 'activate_mm':
>> include/asm-generic/mmu_context.h:60:2: error: implicit declaration of function 'switch_mm' [-Werror=implicit-function-declaration]
      60 |  switch_mm(prev_mm, next_mm, current);
         |  ^~~~~~~~~
   kernel/sched/rt.c: At top level:
   kernel/sched/rt.c:668:6: warning: no previous prototype for 'sched_rt_bandwidth_account' [-Wmissing-prototypes]
     668 | bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/switch_mm +60 include/asm-generic/mmu_context.h

    50	
    51	/**
    52	 * activate_mm - called after exec switches the current task to a new mm, to switch to it
    53	 * @prev_mm: previous mm of this task
    54	 * @next_mm: new mm
    55	 */
    56	#ifndef activate_mm
    57	static inline void activate_mm(struct mm_struct *prev_mm,
    58				       struct mm_struct *next_mm)
    59	{
  > 60		switch_mm(prev_mm, next_mm, current);
    61	}
    62	#endif
    63	

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

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