Linus Torvalds released the second version candidate (RC2) for Linux kernel 6.13, with a release date of December 8, 2024. Kernel 6.13-rc2 has undergone numerous updates, fixes and improvements based on the first RC1 version.

Catalog

• 1. Driver updates dominate
• 2. Architecture Improvement
• 3. Network and BPF updates
• 4. File System and Memory Management
• 5. Watchdog and power management
• Minor but noteworthy fix
• Try Linux Kernel 6.13 RC2

The main highlights of Linux kernel 6.13 RC2

1. Driver updates dominate

Linus Torvalds noted that this version has an unusual diffstat, with more than 80% of the changes in focused on driver-related updates.

This includes enhancements and minor fixes, many of which are a one-line code, derived from automatic cleaning scripts.

In the announcement of Linux kernel 6.13-rc2, Linus wrote:

diffstat looks a bit unusual, with drivers accounting for over 80% and a lot of them are single-line code, but this is really just because some automatic scripts are run after -rc1 for cleaning. Nothing particularly interesting, but this makes a lot of noise in diff.

Other important updates include:

• SPI: Supports Intel Panther Lake SPI controllers.
• GPU Driver: Fixed issues related to AMDGPU recovery processing, workload settings, and display.
• Network: Enhanced updates for Mellanox mlx5 drivers, VLAN trim fixes, and PHY timestamp extraction.
• Watchdog: Additional support for ExynosAutoV920, Airoha EN7851 and improved Mediatek system.

2. Architecture Improvement

• ARM64: Improved memory markup extension (MTE) and ASID masking logic.
• LoongArch: Improved handling of IRQ and giant page table entries.
• x86: Updated to fix PKRU value recovery and add support for Lunar Lake CPU.

3. Network and BPF updates

Several fixes to network-related components, including:

• Solve memory leaks in TCP and NVMe over RDMA.
• Improved ethtool functionality and supported new Mellanox hardware features.
• Enhanced BPF features including LPM trie updates and new test cases.

4. File system and memory management

• Btrfs: Fixed transaction deadlock and cross-reference nowait write issues.
• XFS: Solves the inode restriction issue and the inconsistency of delalloc/quota timer.
• General Memory Management: Improved handling of mmap prompts and fixed errors related to file mapping and NUMA.

5. Watchdog and power management

This version includes updates to the following:

• Watchdog timer implementation
• Power Domain Management
• Platform-specific power management routines

Minor but noteworthy fix

A lot of changes were made to ensure code consistency and resolve subtle errors:

• ALSA: Audio driver adjustments to Realtek devices and RME Digiface USB.
• Documentation: Corrections in ABI References and Module Descriptions.
• General Maintenance: Clean up warnings, typos, and outdated or redundant code.

Try Linux Kernel 6.13 RC2

Linus Torvalds encourages the community to continue testing this version candidate in order to stabilize the kernel before the holidays.

Users can download kernel 6.13-rc2 from the Kernel.org website or Linus Torvalds' git tree .

Based on a typical Linux kernel release cycle, we expect the final release of kernel 6.13 to be released in mid-to-late January 2025.

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