linux-kernel - vmlinux.o: warning: objtool: kernel_kexec+0x7c: machine_kexec() missing __noreturn in .c/.h or NORETURN() in noreturns.h

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Message-ID: <202601050709.pbU4aEGy-lkp@intel.com>
Date: Mon, 05 Jan 2026 08:00:00 +0800
From: kernel test robot <lkp@...el.com>
To: Youling Tang <tangyouling@...inos.cn>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Huacai Chen <chenhuacai@...nel.org>
Subject: vmlinux.o: warning: objtool: kernel_kexec+0x7c:
 machine_kexec() missing __noreturn in .c/.h or NORETURN() in noreturns.h

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   54e82e93ca93e49cb4c33988adec5c8cb9d0df31
commit: d162feec6b6e7ed97986118450812fdd7e9ba202 LoongArch: Add preparatory infrastructure for kexec_file
date:   3 months ago
config: loongarch-randconfig-r121-20260104 (https://download.01.org/0day-ci/archive/20260105/202601050709.pbU4aEGy-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260105/202601050709.pbU4aEGy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601050709.pbU4aEGy-lkp@intel.com/

All warnings (new ones prefixed by >>):

   vmlinux.o: warning: objtool: kernel_entry+0x0: unreachable instruction
   vmlinux.o: warning: objtool: smpboot_entry+0x0: unreachable instruction
>> vmlinux.o: warning: objtool: kernel_kexec+0x7c: machine_kexec() missing __noreturn in .c/.h or NORETURN() in noreturns.h

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki