[ammarfaizi2-block:paulmck/linux-rcu/fastexp.2022.04.01a 117/158] arch/powerpc/include/asm/book3s/64/pgtable-64k.h:60:1: error: no return statement in function returning non-void

[kernel test robot <lkp@intel.com>]

Hi Paul,

First bad commit (maybe != root cause):

tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/fastexp.2022.04.01a
head:   d9f3e7d671416fdf5b61f094765754269b652db0
commit: 33a6b5d291d49c64d5e5d53c9cb7032835fc3e7b [117/158] rcutorture: Allow rcutorture without RCU Tasks Trace
config: powerpc64-randconfig-c003-20220402 (https://download.01.org/0day-ci/archive/20220402/202204021454.WDwBbwVL-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 11.2.0
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://github.com/ammarfaizi2/linux-block/commit/33a6b5d291d49c64d5e5d53c9cb7032835fc3e7b
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/fastexp.2022.04.01a
        git checkout 33a6b5d291d49c64d5e5d53c9cb7032835fc3e7b
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc prepare

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 >>):

   WARNING: unmet direct dependencies detected for TASKS_TRACE_RCU
   Depends on RCU_EXPERT
   Selected by
   - BPF_SYSCALL
   Selected by
   - RCU_REF_SCALE_TEST && DEBUG_KERNEL
   In file included from arch/powerpc/include/asm/book3s/64/pgtable.h:310,
   from arch/powerpc/include/asm/book3s/64/mmu-hash.h:20,
   from arch/powerpc/include/asm/book3s/64/mmu.h:38,
   from arch/powerpc/include/asm/mmu.h:405,
   from arch/powerpc/include/asm/lppaca.h:46,
   from arch/powerpc/include/asm/paca.h:17,
   from arch/powerpc/include/asm/current.h:13,
   from include/linux/thread_info.h:23,
   from include/asm-generic/preempt.h:5,
   from ./arch/powerpc/include/generated/asm/preempt.h:1,
   from include/linux/preempt.h:78,
   from include/linux/spinlock.h:55,
   from include/linux/ipc.h:5,
   from include/uapi/linux/sem.h:5,
   from include/linux/sem.h:5,
   from include/linux/compat.h:14,
   from arch/powerpc/kernel/asm-offsets.c:12:
   arch/powerpc/include/asm/book3s/64/pgtable-64k.h: In function 'get_hugepd_cache_index':
>> arch/powerpc/include/asm/book3s/64/pgtable-64k.h:60:1: error: no return statement in function returning non-void
   60 | }
   | ^
   cc1: some warnings being treated as errors
   Makefile arch include kernel nr_bisected scripts source usr [scripts/Makefile.build:121: arch/powerpc/kernel/asm-offsets.s] Error 1
   Target '__build' not remade because of errors.
   Makefile arch include kernel nr_bisected scripts source usr [Makefile:1190: prepare0] Error 2
   Target 'prepare' not remade because of errors.
   make: Makefile arch include kernel nr_bisected scripts source usr [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for TASKS_TRACE_RCU
   Depends on RCU_EXPERT
   Selected by
   - BPF_SYSCALL
   Selected by
   - RCU_REF_SCALE_TEST && DEBUG_KERNEL


vim +60 arch/powerpc/include/asm/book3s/64/pgtable-64k.h

a9252aaefe7e721 Aneesh Kumar K.V 2016-04-29  53  
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  54  /*
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  55   * This should never get called
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  56   */
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  57  static inline int get_hugepd_cache_index(int index)
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  58  {
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  59  	BUG();
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14 @60  }
fadd03c615922d8 Aneesh Kumar K.V 2018-06-14  61  

:::::: The code at line 60 was first introduced by commit
:::::: fadd03c615922d8521a2e76d4ba2335891cb2790 powerpc/mm/hash/4k: Free hugetlb page table caches correctly.

:::::: TO: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>

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https://01.org/lkp