tree: https://github.com/intel/linux-intel-lts.git 5.4/preempt-rt head: 2046457bf9f4a420f69e915453d59db5b38edbaa commit: 3c3f9863f8b96ccbf6fd420c93f1685f6085651a [15/16] Merge tag 'lts-v5.4.58-yocto-200825T002733Z' into lts2019/yocto-rt config: powerpc64-randconfig-r034-20210610 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/intel/linux-intel-lts/commit/3c3f9863f8b96ccbf6fd420c9... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/preempt-rt git checkout 3c3f9863f8b96ccbf6fd420c93f1685f6085651a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 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 >>): In file included from drivers/connector/cn_proc.c:11: In file included from include/linux/kernel.h:11: In file included from include/linux/compiler.h:256: arch/powerpc/include/asm/barrier.h:47:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:309:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ static DEFINE_LOCAL_IRQ_LOCK(send_msg_lock); ^ 2 warnings generated. -- In file included from fs/squashfs/decompressor_multi_percpu.c:8: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:5: In file included from include/linux/mmdebug.h:5: In file included from include/linux/bug.h:5: In file included from arch/powerpc/include/asm/bug.h:120: In file included from include/asm-generic/bug.h:5: In file included from include/linux/compiler.h:256: arch/powerpc/include/asm/barrier.h:47:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:309:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ static DEFINE_LOCAL_IRQ_LOCK(stream_lock); ^ 2 warnings generated. -- In file included from mm/zswap.c:16: In file included from include/linux/module.h:9: In file included from include/linux/list.h:9: In file included from include/linux/kernel.h:11: In file included from include/linux/compiler.h:256: arch/powerpc/include/asm/barrier.h:47:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:309:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ static DEFINE_LOCAL_IRQ_LOCK(zswap_cpu_lock); ^ 2 warnings generated. vim +/send_msg_lock +44 drivers/connector/cn_proc.c 9f46080c41d5f3 Matt Helsley 2005-11-07 41 cc398c2eae35b1 David S. Miller 2006-01-08 42 /* proc_event_counts is used as the sequence number of the netlink message */ 9f46080c41d5f3 Matt Helsley 2005-11-07 43 static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; 78412101a22410 Mike Galbraith 2016-10-16 @44 static DEFINE_LOCAL_IRQ_LOCK(send_msg_lock); 9f46080c41d5f3 Matt Helsley 2005-11-07 45 :::::: The code at line 44 was first introduced by commit :::::: 78412101a22410944389c3bbc954ba97a0f47e0f connector/cn_proc: Protect send_msg() with a local lock on RT :::::: TO: Mike Galbraith <umgwanakikbuti(a)gmail.com&gt; :::::: CC: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org