Re: [PATCH 1/5] jump_label,module: Don't alloc static_key_mod for __ro_after_init keys

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

Hi Valentin,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on linus/master v6.7-rc2 next-20231120]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Valentin-Schneider/jump_label-module-Don-t-alloc-static_key_mod-for-__ro_after_init-keys/20231120-190044
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20231120105528.760306-2-vschneid%40redhat.com
patch subject: [PATCH 1/5] jump_label,module: Don't alloc static_key_mod for __ro_after_init keys
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20231121/202311210601.9dbatTYU-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231121/202311210601.9dbatTYU-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/202311210601.9dbatTYU-lkp@intel.com/

All errors (new ones prefixed by >>):

>> init/main.c:1406:3: error: call to undeclared function 'jump_label_ro'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   jump_label_ro();
                   ^
   init/main.c:1406:3: note: did you mean 'jump_label_lock'?
   include/linux/jump_label.h:315:20: note: 'jump_label_lock' declared here
   static inline void jump_label_lock(void) {}
                      ^
   1 error generated.


vim +/jump_label_ro +1406 init/main.c

  1394	
  1395	#ifdef CONFIG_STRICT_KERNEL_RWX
  1396	static void mark_readonly(void)
  1397	{
  1398		if (rodata_enabled) {
  1399			/*
  1400			 * load_module() results in W+X mappings, which are cleaned
  1401			 * up with call_rcu().  Let's make sure that queued work is
  1402			 * flushed so that we don't hit false positives looking for
  1403			 * insecure pages which are W+X.
  1404			 */
  1405			rcu_barrier();
> 1406			jump_label_ro();
  1407			mark_rodata_ro();
  1408			rodata_test();
  1409		} else
  1410			pr_info("Kernel memory protection disabled.\n");
  1411	}
  1412	#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
  1413	static inline void mark_readonly(void)
  1414	{
  1415		pr_warn("Kernel memory protection not selected by kernel config.\n");
  1416	}
  1417	#else
  1418	static inline void mark_readonly(void)
  1419	{
  1420		pr_warn("This architecture does not have kernel memory protection.\n");
  1421	}
  1422	#endif
  1423	

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