[openeuler:OLK-6.6 1826/1826] arch/arm64/kernel/ipi_nmi.c:39:2: error: call to undeclared function '__printk_safe_enter'; ISO C99 and later do not support implicit function declarations

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   a5cbe5b715d9cac271b2c6175e728f0c4167f675
commit: 5e3e94b1477ca3f6cb47ae8137a4a99fe0ef6147 [1826/1826] arm64: Add non nmi ipi backtrace support
config: arm64-randconfig-r123-20250118 (https://download.01.org/0day-ci/archive/20250118/202501180414.2c8NAnVD-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20250118/202501180414.2c8NAnVD-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/202501180414.2c8NAnVD-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/arm64/kernel/ipi_nmi.c:39:2: error: call to undeclared function '__printk_safe_enter'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           __printk_safe_enter();
           ^
>> arch/arm64/kernel/ipi_nmi.c:41:2: error: call to undeclared function '__printk_safe_exit'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
           __printk_safe_exit();
           ^
   2 errors generated.


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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