[openeuler:OLK-6.6 2392/15331] arch/arm64/kernel/ipi_nmi.c:39:9: error: implicit declaration of function '__printk_safe_enter'

[openeuler:OLK-6.6 2392/15331] arch/arm64/kernel/ipi_nmi.c:39:9: error: implicit declaration of function '__printk_safe_enter'

[kernel test robot]

Hi Li,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   9d0af12b79bee784902822ddeec2e1a8cfc18524
commit: 5e3e94b1477ca3f6cb47ae8137a4a99fe0ef6147 [2392/15331] arm64: Add non nmi ipi backtrace support
config: arm64-randconfig-003-20241027 (https://download.01.org/0day-ci/archive/20241028/202410280402.j2eHLE32-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241028/202410280402.j2eHLE32-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/202410280402.j2eHLE32-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/arm64/kernel/ipi_nmi.c: In function 'ipi_cpu_backtrace':
>> arch/arm64/kernel/ipi_nmi.c:39:9: error: implicit declaration of function '__printk_safe_enter' [-Wimplicit-function-declaration]
      39 |         __printk_safe_enter();
         |         ^~~~~~~~~~~~~~~~~~~
>> arch/arm64/kernel/ipi_nmi.c:41:9: error: implicit declaration of function '__printk_safe_exit' [-Wimplicit-function-declaration]
      41 |         __printk_safe_exit();
         |         ^~~~~~~~~~~~~~~~~~


vim +/__printk_safe_enter +39 arch/arm64/kernel/ipi_nmi.c

    35	
    36	#ifdef CONFIG_NON_NMI_IPI_BACKTRACE
    37	static void ipi_cpu_backtrace(void *info)
    38	{
  > 39		__printk_safe_enter();
    40		nmi_cpu_backtrace(get_irq_regs());
  > 41		__printk_safe_exit();
    42	}
    43	

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