January 2026 monthly summary for torvalds/linux: Two high-impact bug fixes in ARM64 EFI/MPAM paths delivered. EFI Runtime Services stability improved by enabling preemption during EFI calls, removing non-preemptible state requirement in the ARM64 EFI driver, reducing kernel oops risk and improving error recovery. MPAM feature bitmap handling updated to non-atomic bitops to satisfy kunit tests under PACKED_FOR_KUNIT alignment, ensuring test__props_mismatch passes. Commit references: dd4d71f587f3908f058b516d3793aaed66cfb692; b9f5c38e4af1a094384650d2fc79fb992d6d5e64.

December 2025: Stability and reliability improvements for the torvalds/linux ARM MPAM subsystem. Completed a critical bug fix in the __ris_msmon_read path to prevent crashes by initializing overflow to false and returning early on errors, ensuring safe handling of monitors and MBWU counters. This reduces production risk and improves the accuracy of monitoring data, supporting safer MPAM operations in production environments.

July 2025 monthly summary for geerlingguy/linux focused on delivering correctness and robustness in ARM64 KVM code and strengthening bitfield utilities. Delivered two targeted changes with clear business value: one bug fix in KVM arm64 MDCR_EL2.HPMN enforcement and one defensive feature to prevent misuse of bitfield helpers. These efforts reduce runtime virtualization risk and improve maintainability across the repository.