Hi Arve, FYI, the error/warning still remains. tree: https://android.googlesource.com/kernel/common android-trusty-4.19 head: 2735339966ed1b8c4fa175baefce6024283763a3 commit: 3b73c0e90d449bbb4c49297238c24badc3ed7aa5 [6/11] trusty: Add stdcalltest config: arm64-allmodconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 3b73c0e90d449bbb4c49297238c24badc3ed7aa5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from drivers/trusty/trusty-test.c:15: 133 | int init_module(void) __attribute__((alias(#initfn))); | ^~~~~~~~~~~ include/linux/device.h:1604:1: note: in expansion of macro 'module_init' 1604 | module_init(__driver##_init); | ^~~~~~~~~~~ include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver' 228 | module_driver(__platform_driver, platform_driver_register, | ^~~~~~~~~~~~~ 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/platform_device.h:14, from drivers/trusty/trusty-test.c:8: drivers/trusty/trusty-test.c:449:24: note: 'init_module' target declared here 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~ include/linux/device.h:1600:19: note: in definition of macro 'module_driver' 1600 | static int __init __driver##_init(void) | ^~~~~~~~ 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/trusty/trusty-test.c:15: 139 | void cleanup_module(void) __attribute__((alias(#exitfn))); | ^~~~~~~~~~~~~~ include/linux/device.h:1609:1: note: in expansion of macro 'module_exit' 1609 | module_exit(__driver##_exit); | ^~~~~~~~~~~ include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver' 228 | module_driver(__platform_driver, platform_driver_register, | ^~~~~~~~~~~~~ 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/platform_device.h:14, from drivers/trusty/trusty-test.c:8: drivers/trusty/trusty-test.c:449:24: note: 'cleanup_module' target declared here 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~ include/linux/device.h:1605:20: note: in definition of macro 'module_driver' 1605 | static void __exit __driver##_exit(void) | ^~~~~~~~ 449 | module_platform_driver(trusty_test_driver); | ^~~~~~~~~~~~~~~~~~~~~~ drivers/trusty/trusty-test.c: In function 'trusty_test_run': include/linux/device.h:1442:2: warning: 'obj' may be used uninitialized in this function [-Wmaybe-uninitialized] 1442 | _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~ drivers/trusty/trusty-test.c:287:32: note: 'obj' was declared here 287 | struct trusty_test_shmem_obj *obj; | ^~~ vim +133 include/linux/module.h 0fd972a7d91d6e Paul Gortmaker 2015-05-01 128 0fd972a7d91d6e Paul Gortmaker 2015-05-01 129 /* Each module must use one module_init(). */ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 130 #define module_init(initfn) \ 1f318a8bafcfba Arnd Bergmann 2017-02-01 131 static inline initcall_t __maybe_unused __inittest(void) \ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 132 { return initfn; } \ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 @133 int init_module(void) __attribute__((alias(#initfn))); 0fd972a7d91d6e Paul Gortmaker 2015-05-01 134 0fd972a7d91d6e Paul Gortmaker 2015-05-01 135 /* This is only required if you want to be unloadable. */ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 136 #define module_exit(exitfn) \ 1f318a8bafcfba Arnd Bergmann 2017-02-01 137 static inline exitcall_t __maybe_unused __exittest(void) \ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 138 { return exitfn; } \ 0fd972a7d91d6e Paul Gortmaker 2015-05-01 @139 void cleanup_module(void) __attribute__((alias(#exitfn))); 0fd972a7d91d6e Paul Gortmaker 2015-05-01 140 :::::: The code at line 133 was first introduced by commit :::::: 0fd972a7d91d6e15393c449492a04d94c0b89351 module: relocate module_init from init.h to module.h :::::: TO: Paul Gortmaker <paul.gortmaker(a)windriver.com&gt; :::::: CC: Paul Gortmaker <paul.gortmaker(a)windriver.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org