Worked on the geerlingguy/linux repository to enhance the reliability of the kernel timer subsystem, focusing on timer management within embedded systems. Addressed a critical bug where softirq-based high-resolution timers failed to expire correctly after CPU migration, particularly when high-resolution and NOHZ modes were inactive. The solution involved unconditionally updating the target CPU base after timer migration, ensuring that migrated hrtimers retrigger as expected across offline CPU scenarios. Utilized C for kernel development, providing clear commit messages and thorough code comments to support future maintenance. This work improved the predictability and stability of timer-driven workloads in multi-CPU environments.