: This function is used to allocate a page of memory. The exact behavior can depend on the context (e.g., within the Linux kernel), but generally, it allocates memory in units of pages, which is a fundamental unit of memory management in many operating systems. The size of a page varies by architecture but is commonly 4KB.
While using #define for such purposes can be convenient, it's often more readable and maintainable to use inline functions or directly call alloc_page(gfp_atomic) where needed, especially in complex codebases. #define labyrinth (void *)alloc_page(gfp_atomic)
The gfp_atomic flag tells alloc_page to perform an atomic allocation, which means that the function will not block or sleep if there are no free pages available. : This function is used to allocate a page of memory
#define labyrinth (void *)alloc_page(gfp_atomic) is a line of code that defines a macro named labyrinth . To understand this, let's break it down: While using #define for such purposes can be
#include <linux/module.h> // Needed by all modules #include <linux/kernel.h> // Needed for KERN_INFO
