Re: [PATCH 1/2] printk: nbcon: Export console_is_usage and other nbcon symbols

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

Hi Marcos,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d0b3b7b22dfa1f4b515fd3a295b3fd958f9e81af]

url:    https://github.com/intel-lab-lkp/linux/commits/Marcos-Paulo-de-Souza/printk-nbcon-Export-console_is_usage-and-other-nbcon-symbols/20250713-131106
base:   d0b3b7b22dfa1f4b515fd3a295b3fd958f9e81af
patch link:    https://lore.kernel.org/r/20250713-nbcon-kgdboc-v1-1-51eccd9247a8%40suse.com
patch subject: [PATCH 1/2] printk: nbcon: Export console_is_usage and other nbcon symbols
config: x86_64-buildonly-randconfig-001-20250713 (https://download.01.org/0day-ci/archive/20250713/202507131443.p6jEjXFw-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250713/202507131443.p6jEjXFw-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/202507131443.p6jEjXFw-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/char/tpm/tpm_tis.c:21:
   In file included from include/linux/pnp.h:16:
>> include/linux/console.h:653:76: warning: non-void function does not return a value [-Wreturn-type]
     653 | static inline bool nbcon_context_try_acquire(struct nbcon_context *ctxt) { }
         |                                                                            ^
   In file included from drivers/char/tpm/tpm_tis.c:29:
   In file included from drivers/char/tpm/tpm.h:28:
   include/linux/tpm_eventlog.h:167:6: warning: variable 'mapping_size' set but not used [-Wunused-but-set-variable]
     167 |         int mapping_size;
         |             ^
   2 warnings generated.


vim +653 include/linux/console.h

   651	
   652	#else
 > 653	static inline bool nbcon_context_try_acquire(struct nbcon_context *ctxt) { }
   654	static inline void nbcon_context_release(struct nbcon_context *ctxt) { }
   655	static inline void nbcon_cpu_emergency_enter(void) { }
   656	static inline void nbcon_cpu_emergency_exit(void) { }
   657	static inline bool nbcon_can_proceed(struct nbcon_write_context *wctxt) { return false; }
   658	static inline bool nbcon_enter_unsafe(struct nbcon_write_context *wctxt) { return false; }
   659	static inline bool nbcon_exit_unsafe(struct nbcon_write_context *wctxt) { return false; }
   660	static inline void nbcon_reacquire_nobuf(struct nbcon_write_context *wctxt) { }
   661	static inline bool console_is_usable(struct console *con, short flags,
   662					     bool use_atomic) { return false; }
   663	#endif
   664	

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