Hi Hongbo,

FYI, the error/warning still remains.

tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: bf0212daf6239e1b0e65e6dd7ee9fdec378c5dd4 commit: 923efc4dc37c1a7cc91f0dd5dbdc87e0943ad1ae [2461/2461] tty: fix possible deadlock in console_unlock config: arm64-randconfig-003-20241120 (https://download.01.org/0day-ci/archive/20241121/202411210035.9JVLQU7Y-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241121/202411210035.9JVLQU7Y-lkp@i...)

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/202411210035.9JVLQU7Y-lkp@intel.com/

All errors (new ones prefixed by >>):

drivers/tty/tty_buffer.c: In function 'tty_buffer_alloc': drivers/tty/tty_buffer.c:175:9: error: implicit declaration of function 'printk_safe_enter'; did you mean 'printk_nmi_enter'? [-Werror=implicit-function-declaration] 175 | printk_safe_enter(); | ^~~~~~~~~~~~~~~~~ | printk_nmi_enter

...

drivers/tty/tty_buffer.c:177:9: error: implicit declaration of function 'printk_safe_exit'; did you mean 'printk_nmi_exit'? [-Werror=implicit-function-declaration]

177 | printk_safe_exit(); | ^~~~~~~~~~~~~~~~ | printk_nmi_exit cc1: some warnings being treated as errors

vim +177 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