This release does seem to continue to be more active in the rc's than usual, but it actually feels like it's calming down. So rc4 is larger than an rc4 release usually is (about 400 non-merge commits, when usually at this stage we should be at ~300), but at the same time it feels fairly normal. There was the watchdog merge that I already mentioned in the rc3 release, but other than that it looks much more like a normal rc than rc3 did, for example.
In particular, ignoring that core watchdog thing, it's the usual "mostly drivers and arch updates". This time most of the arch updates (by far) are arm, and the driver5s are dominated by networking, but there's other stuff in there too (USB, MMC, HID..). And then the usual random stuff elsewhere.
The good news is that the diffstat is pretty flat - ie the changes are pretty small. The exception is that core watchdog thing, and some stm32 dts-file reorg.
So I do have some hope that things are approaching normal. I'd expect that to continue, and things start calming down. If rc5 doesn't show noticeable signs of that calming down, I suspect we'll have to start thinking about rc8 etc, but we'll see The kernel summit is approaching, so people will be traveling later in the release cycle. We'll see how that affects things too.
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