[powerpc:next-test 9/109] arch/powerpc/include/asm/paca.h:291:36: warning: declaration of 'struct mm_struct' will not be visible outside of this function

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
head:   0f71dcfb4aef6043da6cc509e7a7f6a3ae87c12d
commit: 3a24ea0df83e32355d897a18bbd82e05986dcdc3 [9/109] powerpc/kuap: Use ASM feature fixups instead of static branches
config: powerpc64-randconfig-r012-20230822 (https://download.01.org/0day-ci/archive/20230822/202308220857.uFq2oAxM-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230822/202308220857.uFq2oAxM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202308220857.uFq2oAxM-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/mm/nohash/kup.c:11:
   In file included from arch/powerpc/include/asm/kup.h:24:
   In file included from arch/powerpc/include/asm/nohash/kup-booke.h:6:
   In file included from arch/powerpc/include/asm/mmu.h:148:
   In file included from arch/powerpc/include/asm/percpu.h:20:
   arch/powerpc/include/asm/paca.h:155:23: error: field has incomplete type 'struct tlb_core_data'
     155 |         struct tlb_core_data tcd;
         |                              ^
   arch/powerpc/include/asm/paca.h:139:9: note: forward declaration of 'struct tlb_core_data'
     139 |         struct tlb_core_data *tcd_ptr;
         |                ^

quoted

arch/powerpc/include/asm/paca.h:291:36: warning: declaration of 'struct mm_struct' will not be visible outside of this function [-Wvisibility]

     291 | extern void copy_mm_to_paca(struct mm_struct *mm);
         |                                    ^
   1 warning and 1 error generated.


vim +291 arch/powerpc/include/asm/paca.h

^1da177e4c3f41 include/asm-ppc64/paca.h        Linus Torvalds   2005-04-16  290  
54be0b9c7c9888 arch/powerpc/include/asm/paca.h Michael Ellerman 2018-10-02 @291  extern void copy_mm_to_paca(struct mm_struct *mm);
d2e60075a3d442 arch/powerpc/include/asm/paca.h Nicholas Piggin  2018-02-14  292  extern struct paca_struct **paca_ptrs;
1426d5a3bd0758 arch/powerpc/include/asm/paca.h Michael Ellerman 2010-01-28  293  extern void initialise_paca(struct paca_struct *new_paca, int cpu);
fc53b4202e61c7 arch/powerpc/include/asm/paca.h Matt Evans       2010-07-07  294  extern void setup_paca(struct paca_struct *new_paca);
59f577743d71bf arch/powerpc/include/asm/paca.h Nicholas Piggin  2018-02-14  295  extern void allocate_paca_ptrs(void);
59f577743d71bf arch/powerpc/include/asm/paca.h Nicholas Piggin  2018-02-14  296  extern void allocate_paca(int cpu);
1426d5a3bd0758 arch/powerpc/include/asm/paca.h Michael Ellerman 2010-01-28  297  extern void free_unused_pacas(void);
1426d5a3bd0758 arch/powerpc/include/asm/paca.h Michael Ellerman 2010-01-28  298  

:::::: The code at line 291 was first introduced by commit
:::::: 54be0b9c7c9888ebe63b89a31a17ee3df6a68d61 Revert "convert SLB miss handlers to C" and subsequent commits

:::::: TO: Michael Ellerman [off-list ref]
:::::: CC: Michael Ellerman [off-list ref]

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