Develop production-grade Linux Kernel Modules (LKM), character device drivers (`cdev`), and hardware control abstractions in C. Implement file operations (`open`, `read`, `write`, `unlocked_ioctl`), kernel memory allocators (`kmalloc`, `vmalloc`), spinlocks, mutexes, interrupt request handlers (bottom halves / tasklets), and sysfs attributes. Trigger when writing kernel drivers, low-level hardware interfaces, or debugging kernel crashes.
