[openeuler:OLK-5.10 2820/30000] drivers/tty/tty_buffer.c:175:2: error: implicit declaration of function 'printk_safe_enter'

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

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   5a1d9701155c6908c76c68951170f10279685143
commit: 923efc4dc37c1a7cc91f0dd5dbdc87e0943ad1ae [2820/30000] tty: fix possible deadlock in console_unlock
config: x86_64-buildonly-randconfig-003-20240914 (https://download.01.org/0day-ci/archive/20240914/202409141036.Dno2bUGL-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240914/202409141036.Dno2bUGL-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/202409141036.Dno2bUGL-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/tty/tty_buffer.c:175:2: error: implicit declaration of function 'printk_safe_enter' [-Werror,-Wimplicit-function-declaration]
     175 |         printk_safe_enter();
         |         ^
   drivers/tty/tty_buffer.c:175:2: note: did you mean 'printk_nmi_enter'?
   include/linux/printk.h:158:20: note: 'printk_nmi_enter' declared here
     158 | static inline void printk_nmi_enter(void) { }
         |                    ^
>> drivers/tty/tty_buffer.c:177:2: error: implicit declaration of function 'printk_safe_exit' [-Werror,-Wimplicit-function-declaration]
     177 |         printk_safe_exit();
         |         ^
   2 errors generated.


vim +/printk_safe_enter +175 drivers/tty/tty_buffer.c

   142	
   143	/**
   144	 *	tty_buffer_alloc	-	allocate a tty buffer
   145	 *	@port: tty port
   146	 *	@size: desired size (characters)
   147	 *
   148	 *	Allocate a new tty buffer to hold the desired number of characters.
   149	 *	We round our buffers off in 256 character chunks to get better
   150	 *	allocation behaviour.
   151	 *	Return NULL if out of memory or the allocation would exceed the
   152	 *	per device queue
   153	 */
   154	
   155	static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
   156	{
   157		struct llist_node *free;
   158		struct tty_buffer *p;
   159	
   160		/* Round the buffer size out */
   161		size = __ALIGN_MASK(size, TTYB_ALIGN_MASK);
   162	
   163		if (size <= MIN_TTYB_SIZE) {
   164			free = llist_del_first(&port->buf.free);
   165			if (free) {
   166				p = llist_entry(free, struct tty_buffer, free);
   167				goto found;
   168			}
   169		}
   170	
   171		/* Should possibly check if this fails for the largest buffer we
   172		   have queued and recycle that ? */
   173		if (atomic_read(&port->buf.mem_used) > port->buf.mem_limit)
   174			return NULL;
 > 175		printk_safe_enter();
   176		p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
 > 177		printk_safe_exit();
   178		if (p == NULL)
   179			return NULL;
   180	
   181	found:
   182		tty_buffer_reset(p, size);
   183		atomic_add(size, &port->buf.mem_used);
   184		return p;
   185	}
   186	

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