vmlinux.o: warning: objtool: kernel_entry+0x118: start_kernel() missing __noreturn in .c/.h or NORETURN() in noreturns.h

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cee9395acd8043be0644b25c34bfa86623f2b935
commit: 1b2f4706c6a20ab6ac41533dd8032d54322076e3 LoongArch: Use UNWIND_HINT_END_OF_STACK for entry points
date:   8 months ago
config: loongarch-randconfig-002-20260829 (https://download.01.org/0day-ci/archive/20260901/202609010734.HlRB5VXA-lkp@xxxxxxxxx/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 52774473867e49b5891ab9381accf4e5a3ce0024)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260901/202609010734.HlRB5VXA-lkp@xxxxxxxxx/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
| Fixes: 1b2f4706c6a2 ("LoongArch: Use UNWIND_HINT_END_OF_STACK for entry points")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609010734.HlRB5VXA-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> vmlinux.o: warning: objtool: kernel_entry+0x118: start_kernel() missing __noreturn in .c/.h or NORETURN() in noreturns.h
>> vmlinux.o: warning: objtool: smpboot_entry+0xa4: start_secondary() missing __noreturn in .c/.h or NORETURN() in noreturns.h
   vmlinux.o: warning: objtool: kernel_kexec+0xb8: machine_kexec() missing __noreturn in .c/.h or NORETURN() in noreturns.h
   vmlinux.o: warning: objtool: wdt_interrupt+0x48: machine_restart() missing __noreturn in .c/.h or NORETURN() in noreturns.h
   vmlinux.o: warning: objtool: sama5d4_wdt_irq_handler+0x88: machine_restart() missing __noreturn in .c/.h or NORETURN() in noreturns.h
   vmlinux.o: warning: objtool: rzn1_wdt_irq+0x34: machine_restart() missing __noreturn in .c/.h or NORETURN() in noreturns.h
   vmlinux.o: warning: objtool: eurwdt_interrupt+0x40: machine_restart() missing __noreturn in .c/.h or NORETURN() in noreturns.h

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https://github.com/intel/lkp-tests/wiki