CC: linux-kernel(a)vger.kernel.org TO: Marco Elver <elver(a)google.com&gt; CC: "Paul E. McKenney" <paulmck(a)kernel.org&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next head: 6a3aa1f6d19ed22b517cbb0acc0f88cda4ad42ad commit: fe90808c12f91a180afde9eb71ce44dfcd99bbc3 [42/52] kcsan: Support WEAK_MEMORY with Clang where no objtool support exists config: x86_64-randconfig-a003-20210928 (https://download.01.org/0day-ci/archive/20211208/202112080042.l1yRbman-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) 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://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/com... git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags paulmck-rcu rcu/next git checkout fe90808c12f91a180afde9eb71ce44dfcd99bbc3 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 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 >>): vmlinux.o: warning: objtool: do_syscall_64()+0x4c: call to memset() leaves .noinstr.text section vmlinux.o: warning: objtool: do_int80_syscall_32()+0x6b: call to memset() leaves .noinstr.text section vmlinux.o: warning: objtool: __do_fast_syscall_32()+0x6f: call to memset() leaves .noinstr.text section vmlinux.o: warning: objtool: fixup_bad_iret()+0x1e: call to memset() leaves .noinstr.text section vmlinux.o: warning: objtool: in_task_stack()+0x13: call to task_stack_page() leaves .noinstr.text section vmlinux.o: warning: objtool: in_entry_stack()+0x10: call to cpu_entry_stack() leaves .noinstr.text section vmlinux.o: warning: objtool: exc_nmi()+0x8: call to sev_es_nmi_complete() leaves .noinstr.text section vmlinux.o: warning: objtool: enter_from_user_mode()+0x55: call to __kcsan_check_access() leaves .noinstr.text section vmlinux.o: warning: objtool: syscall_enter_from_user_mode()+0x5c: call to __kcsan_check_access() leaves .noinstr.text section vmlinux.o: warning: objtool: syscall_enter_from_user_mode_prepare()+0x55: call to __kcsan_check_access() leaves .noinstr.text section vmlinux.o: warning: objtool: irqentry_enter_from_user_mode()+0x55: call to __kcsan_check_access() leaves .noinstr.text section --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org