More than halt the rc2 patch is actually Documentaiton updates,
because the kvm docs got turned into RST.
Another notable chunk is just tooling updates, which is about 50/50
perf updates (much of it due to header file syncing) and - again - kvm
But if you ignore those parts, and look at only the actual kernel code
updates, things look a bit calmer. The bulk ends up being network
driver updates (intel "ice" driver - E800 series - stands out) with
GPU updates a close second (i915, amd, panfrost). There's a few other
driver updates in there too, but they are mostly hidden in the noise
compared to the network and gpu subsystems: rdma, sound, acpi, block,
Outside of drivers, there's the usual smattering of changes all over.
Filesystems (nfs, ext4, ceph, cifs, btrfs), architecture updates (x86,
arm), and some core code (scheduling, tracing, networking, io_uring).
The shortlog is appended, you can get a feel for the details by scanning it.
Go forth and test,