linux: bump to 6.12 (turn off PREEMPT_RT) #249
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Upstream Linux doesn't support PREEMPT_RT for 32-bit ARM. Rather than patching, go with the default. PREEMPT_RT is available with nerves_system_rpi0_2 which runs a 64-bit kernel.
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Pull Request Overview
This PR upgrades the Linux kernel from version 6.6 to 6.12 and removes PREEMPT_RT support, as upstream Linux doesn't support PREEMPT_RT for 32-bit ARM. The kernel now uses the standard PREEMPT configuration instead of the real-time variant.
- Kernel updated from 6.6 to 6.12 with corresponding Raspberry Pi patches (stable_20250916)
- PREEMPT_RT patch removed (patch-6.6.74-rt48.patch.gz)
- Raspberry Pi firmware updated to version 1.20250915
Reviewed Changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| nerves_defconfig | Updated kernel tarball to stable_20250916, removed PREEMPT_RT patch reference, updated kernel config reference to linux-6.12.defconfig, and bumped firmware to 1.20250915 |
| mix.exs | Updated package files list to reference linux-6.12.defconfig instead of linux-6.6.defconfig |
| linux/0001-squashfs-provide-backing_dev_info-in-order-to-disabl.patch | Removed squashfs patch (likely integrated upstream in newer kernel or no longer needed) |
| linux-6.12.defconfig | Removed obsolete kernel config options (CONFIG_CPU_SW_DOMAIN_PAN and CONFIG_WLAN_VENDOR_CISCO) that are no longer present in Linux 6.12 |
| REUSE.toml | Updated licensing annotations to remove linux/* directory reference and update defconfig file path |
| README.md | Updated documentation to reflect kernel version 6.12 |
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Tested on an RPi Zero 2W |
lawik
approved these changes
Nov 16, 2025
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Upstream Linux doesn't support PREEMPT_RT for 32-bit ARM. Rather than
patching, go with the default. PREEMPT_RT is available with
nerves_system_rpi0_2 which runs a 64-bit kernel.