Linux 7.2-rc7 Adds 15-Button Zenaim Controller, Fixes 2 Laptop Keyboard Issues

Q: Why was a risky late-cycle infrastructure change quietly pushed into Linux 7.2 to prevent silent data loss?

It was pushed late because Btrfs developers judged the alternative worse: without restoring the fixup worker infrastructure, Linux 7.2 could allow silent data loss. The change was not a new feature in the usual sense but a data-integrity safeguard. SUSE Btrfs maintainer David Sterba said the restored mechanism detects pages or folios that become marked dirty without the filesystem’s knowledge and therefore miss the required copy-on-write fixup. If that fixup does not happen, data can be written out incorrectly, which creates the risk of corruption without obvious errors being reported. That made it a risky late-cycle infrastructure change: it reintroduced more than 600 lines of code near the end of the release cycle, and part of it had to be updated for newer kernel realities such as the folio API and subpage block-size support. In normal circumstances, maintainers try to avoid that kind of broad plumbing change this late. It appears to have been merged quietly because the kernel team treated it as a necessary corrective measure rather than a headline feature. Torvalds himself flagged “btrfs bringing back the fixup worker infrastructure” as one of the few larger diffs in 7.2-rc7, but he also said nothing looked especially scary overall and saw no reason to delay release. So the reason was straightforward: maintainers accepted late-cycle risk in order to prevent a more serious outcome—silent, hard-to-detect Btrfs data loss.

2 articles · Updated · Phoronix · Aug 10

Linux 7.2-rc7 adds XPad support for the 15-button Zenaim Leverless, a fighting-game controller that previously shipped with Microsoft Windows support.
The controller needed only new USB vendor and device IDs, while the same input pull adds ATKBD quirks to restore keyboard function on HONOR ZQC-P and Xiaomi Book Pro 14 laptops.
That input update also bundles broader driver fixes, including out-of-bounds, information-leak, validation, use-after-free and initialization bugs across multiple input drivers.
The changes land in an rc7 release already focused on bug fixing, with the stable Linux 7.2 release expected around August 16.