tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.13.y-rt-testing head: 2eb9270f1294b849cb310d6fb1f2675dfb3f9c75 commit: dde8c73f2bd04af94cef72c96424d776537170af [57/226] mm, slub: optionally save/restore irqs in slab_[un]lock()/ config: mips-randconfig-r032-20210709 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.13.y-rt-testing git checkout dde8c73f2bd04af94cef72c96424d776537170af # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=mips SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): slab_lock(struct page unsigned long ^ static __always_inline void slab_unlock(struct page unsigned long ^ mm/slub.c:1507:29: warning: unused function 'node_nr_slabs' static inline unsigned long node_nr_slabs(struct kmem_cache_node ^ mm/slub.c:1525:21: warning: unused function 'kmalloc_large_node_hook' static inline void size_t size, gfp_t flags) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 or $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 13.0.0 (git://gitmirror/llvm_project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-8d69635ed9/bin clang-13: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm samples scripts security sound source usr virt vim +/slab_lock +376 mm/slub.c 374 375 static __always_inline void 377 { 378 __slab_lock(page, flags, false); 379 } 380 382 { 383 __slab_unlock(page, flags, false); 384 } 385 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org