[ANNOUNCE] Linux 4.4.15-cip15-rt10

Daniel Wagner <daniel.wagner@...>

Hello CIP RT Folks!

I'm pleased to announce the Linux 4.4.15-cip15-rt10 stable release.

You can get this release via the git tree at:


branch: linux-4.4.y-cip-rt
Head SHA1: 6c97018d1d4626e21b5233eb28e607e412c79ebe

Currently, I don't have uploaded the patches, because I need to figure
out how this works on kernel.org.

The release is based on the Linux 4.4.75-rt88 version. That is I
applied the -rt88 patch on the 4.4.75-cip6 kernel and merged in all
CIP releases.

Note we got via the stable tree the new RT pull/push logic
from upstream cb1831a83e54 ("sched/rt: Simplify the IPI based RT
balancing logic").

I spend quite a while to get a baseline configuration working and
the testing up and running. I have a BeagleBone Black and a MinnowBoard
Turbot as test target. On the BBB, cyclictest reports reasonable
numbers, though not the MinnowBoard Turbot. It seems the bios/uefi
or so is eating CPU time. The exact same kernel works on different
x86 hardware just fine.

Furthermore, I let the kernel run on the Real-Time Linux Continuous
Integration servers:


Some of the builds are failing (allmodconfig), though it
doesn't look cip-rt specific, eg:

kernel/utilities/compiletest-runner@2/build/../include/linux/compiler.h:484 call to ‘__compiletime_assert_150’ declared with attribute error: BUILD_BUG_ON failed: hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1

Not sure how to handle those. IIRC, we don't support allmodconfig.

Next steps are improving my tests and identifying which 4.4.${x}-rt${y}
changes should be added to the cip-rt kernel.


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