驱动开发中，每次make都有警告，但是不影响编译。

wzlwy

make -C /home/wzlwy/linux/wzl_linux/kernel_wzl/wzl_linux_4.19.35_imx6ull M=/home/wzlwy/linux/wzl_linux/linux_drivers/17_platform modules
make[1]: 进入目录“/home/wzlwy/linux/wzl_linux/kernel_wzl/wzl_linux_4.19.35_imx6ull”
  CC [M]  /home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.o
In file included from /home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:6:
./include/linux/module.h:133:6: warning: ‘init_module’ specifies less restrictive attribute than its target ‘leddevice_init’: ‘cold’ [-Wmissing-attributes]
  133 |  int init_module(void) __attribute__((alias(#initfn)));
      |      ^~~~~~~~~~~
/home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:38:1: note: in expansion of macro ‘module_init’
   38 | module_init(leddevice_init);
      | ^~~~~~~~~~~
/home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:24:19: note: ‘init_module’ target declared here
   24 | static int __init leddevice_init(void)
      |                   ^~~~~~~~~~~~~~
In file included from /home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:6:
./include/linux/module.h:139:7: warning: ‘cleanup_module’ specifies less restrictive attribute than its target ‘leddevice_exit’: ‘cold’ [-Wmissing-attributes]
  139 |  void cleanup_module(void) __attribute__((alias(#exitfn)));
      |       ^~~~~~~~~~~~~~
/home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:39:1: note: in expansion of macro ‘module_exit’
   39 | module_exit(leddevice_exit);
      | ^~~~~~~~~~~
/home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.c:33:20: note: ‘cleanup_module’ target declared here
   33 | static void __exit leddevice_exit(void)
      |                    ^~~~~~~~~~~~~~
  Building modules, stage 2.
  MODPOST 1 modules
  LD [M]  /home/wzlwy/linux/wzl_linux/linux_drivers/17_platform/leddevice.ko
make[1]: 离开目录“/home/wzlwy/linux/wzl_linux/kernel_wzl/wzl_linux_4.19.35_imx6ull”

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