[kbuild-all] mm/z3fold.c:280:37: warning: unused function 'handle_to_z3fold_header'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1e2a199f6ccdc15cf111d68d212e2fd4ce65682e commit: fc5488651c7d840c9cad9b0f273f2f31bd03413a z3fold: simplify freeing slots date: 5 weeks ago config: mips-randconfig-r033-20210119 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout fc5488651c7d840c9cad9b0f273f2f31bd03413a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static inline struct z3fold_header long h) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 154, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $1, $2 # atomic_fetch_sub subu $0, $1, $3 sc $0, $2 beqz $0, 1b .set pop move $0, $1 ' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 22b68440e1647e16b5ee24b924986207173c02d1) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-22b68440e1/bin clang-12: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm net scripts security sound source usr virt vim +/handle_to_z3fold_header +280 mm/z3fold.c 4a3ac9311dac3850 Vitaly Wool 2019-11-30 278 4a3ac9311dac3850 Vitaly Wool 2019-11-30 279 /* Returns the z3fold page where a given handle is stored */ 4a3ac9311dac3850 Vitaly Wool 2019-11-30 @280 static inline struct z3fold_header *handle_to_z3fold_header(unsigned long h) 4a3ac9311dac3850 Vitaly Wool 2019-11-30 281 { 4a3ac9311dac3850 Vitaly Wool 2019-11-30 282 return __get_z3fold_header(h, false); 4a3ac9311dac3850 Vitaly Wool 2019-11-30 283 } 4a3ac9311dac3850 Vitaly Wool 2019-11-30 284 :::::: The code at line 280 was first introduced by commit :::::: 4a3ac9311dac3850d1fbaa8bcad4cf10c4fc6296 mm/z3fold.c: add inter-page compaction :::::: TO: Vitaly Wool <vitaly.wool(a)konsulko.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org