Worked on kernel development for the geerlingguy/linux and torvalds/linux repositories, focusing on Bluetooth protocol handling and file system reliability. Delivered a refactor that removed duplicate Bluetooth HCI UART buffer functions, standardizing on a core implementation to improve maintainability and reduce code duplication. Addressed a Btrfs issue by restoring compatibility for LZO compression level handling during mount, preventing user-facing failures. Further stabilized the Bluetooth subsystem build by resolving header dependency issues and refining Kconfig settings. All changes were implemented in C, emphasizing cross-repository refactoring, adherence to kernel coding standards, and a methodical approach to improving code clarity and system stability.