KERNEL_SRC indicates the kernel source directory and SUBDIR indicates the directory where the module is located.

KERNEL_SRC指定内核源文件所在的目录，SUBDIR指定放置模块的目录。

youdao

This means that the file you specified (in this case filename) does not exist and that the directory it’s supposed to be in (in this case dir/subdir) doesn’t exist either.

这就表示您所指定的文件（这里是 filename）不存在，它所应该在的目录（这里是 dir/subdir ）也不存在。

youdao