[peterz-queue:x86/ibt 7/10] arch/x86/kernel/smpboot.c:338:5: error: expected string literal before '__ANNOTATE_NOENDBR'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/ibt
head:   9ba52bc66d03d8fa986fb5a6d5a026702eb90747
commit: 3957c7e9f1b4bc3d2062c09d19f16e9bf8451bbc [7/10] x86/boot: Mark start_secondary() with __noendbr
config: i386-defconfig (https://download.01.org/0day-ci/archive/20231125/202311250934.ncCQCv97-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231125/202311250934.ncCQCv97-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311250934.ncCQCv97-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kernel/smpboot.c:338:5: error: expected string literal before '__ANNOTATE_NOENDBR'
    asm(__ANNOTATE_NOENDBR(start_secondary));
        ^~~~~~~~~~~~~~~~~~


vim +/__ANNOTATE_NOENDBR +338 arch/x86/kernel/smpboot.c

   249	
   250	/*
   251	 * Activate a secondary processor.
   252	 */
   253	static void notrace __noendbr start_secondary(void *unused)
   254	{
   255		/*
   256		 * Don't put *anything* except direct CPU state initialization
   257		 * before cpu_init(), SMP booting is too fragile that we want to
   258		 * limit the things done here to the most necessary things.
   259		 */
   260		cr4_init();
   261	
   262		/*
   263		 * 32-bit specific. 64-bit reaches this code with the correct page
   264		 * table established. Yet another historical divergence.
   265		 */
   266		if (IS_ENABLED(CONFIG_X86_32)) {
   267			/* switch away from the initial page table */
   268			load_cr3(swapper_pg_dir);
   269			__flush_tlb_all();
   270		}
   271	
   272		cpu_init_exception_handling();
   273	
   274		/*
   275		 * Load the microcode before reaching the AP alive synchronization
   276		 * point below so it is not part of the full per CPU serialized
   277		 * bringup part when "parallel" bringup is enabled.
   278		 *
   279		 * That's even safe when hyperthreading is enabled in the CPU as
   280		 * the core code starts the primary threads first and leaves the
   281		 * secondary threads waiting for SIPI. Loading microcode on
   282		 * physical cores concurrently is a safe operation.
   283		 *
   284		 * This covers both the Intel specific issue that concurrent
   285		 * microcode loading on SMT siblings must be prohibited and the
   286		 * vendor independent issue`that microcode loading which changes
   287		 * CPUID, MSRs etc. must be strictly serialized to maintain
   288		 * software state correctness.
   289		 */
   290		load_ucode_ap();
   291	
   292		/*
   293		 * Synchronization point with the hotplug core. Sets this CPUs
   294		 * synchronization state to ALIVE and spin-waits for the control CPU to
   295		 * release this CPU for further bringup.
   296		 */
   297		cpuhp_ap_sync_alive();
   298	
   299		cpu_init();
   300		fpu__init_cpu();
   301		rcutree_report_cpu_starting(raw_smp_processor_id());
   302		x86_cpuinit.early_percpu_clock_init();
   303	
   304		ap_starting();
   305	
   306		/* Check TSC synchronization with the control CPU. */
   307		check_tsc_sync_target();
   308	
   309		/*
   310		 * Calibrate the delay loop after the TSC synchronization check.
   311		 * This allows to skip the calibration when TSC is synchronized
   312		 * across sockets.
   313		 */
   314		ap_calibrate_delay();
   315	
   316		speculative_store_bypass_ht_init();
   317	
   318		/*
   319		 * Lock vector_lock, set CPU online and bring the vector
   320		 * allocator online. Online must be set with vector_lock held
   321		 * to prevent a concurrent irq setup/teardown from seeing a
   322		 * half valid vector space.
   323		 */
   324		lock_vector_lock();
   325		set_cpu_online(smp_processor_id(), true);
   326		lapic_online();
   327		unlock_vector_lock();
   328		x86_platform.nmi_init();
   329	
   330		/* enable local interrupts */
   331		local_irq_enable();
   332	
   333		x86_cpuinit.setup_percpu_clockev();
   334	
   335		wmb();
   336		cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
   337	}
 > 338	asm(__ANNOTATE_NOENDBR(start_secondary));
   339	

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