In the realm of computer science and programming, several technical terms can seem like a labyrinth to navigate, especially for those new to the field. This article aims to demystify four key concepts: void , alloc_page , GFP_ATOMIC , and extra quality . By the end of this read, you'll have a clearer understanding of these terms and how they fit into the broader context of programming and system development. In programming, void is a keyword used in function declarations. It indicates that the function does not return any value. For example, if you have a function that performs some operations but doesn't need to return a value to the caller, you would declare it with a return type of void .