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Subject[ANNOUNCE] 4.1.2-rt1
Dear RT folks!

I'm pleased to announce the v4.1.2-rt1 patch set.

The move from 4.0 to 4.1 was rather smooth, so we took the time for
some overdue cleanups and restructuring of the patch queue.

1) Patch folding

- Fold all fixlets into the proper patches

- Consolidate the patches which change the same piece of code over
and over (e.g. add/revert/redo).

These patches were mostly kept to be easily picked up for stable.

2) Dropping obsolete patches

Some patches have been superseeded by different upstream changes,
so the RT variant is redundant.

3) Changelogs

Quite some patches had no or useless changelogs. We updated them
all. Each patch has now a From+Subject+Date field. That means "git
quiltimport" will produce now the same commit id for each patch (as
long as the commit author and date remain unchanged).

4) Reordering

The patches got reordered in topics, so patches related to the same
subsystem or problem space are grouped together.

5) Ability to build and boot

Each step in the queue now builds with RT=n and RT=y. All steps
boot with RT=n. With RT=y the functionality is obviously dependent
on all patches, so a boot bisectability can not be achieved.

As of now we provide a git tree with the RT changes as well. The tree
is similar structured as Stevens stable RT tree. For each kernel
version we provide 3 branches:

linux-m.n.y-rt

This branch starts when we move to a new kernel version. After
the first release this branch gets only incremental updates
(either from the mainline stable tree or from updates to the
rt patch queue)

linux-m.n.y-rt-rebase

This branch is rebased when a new stable version or a new RT
patch queue is available. The RT patch queue is applied on top
of the latest mainline stable version.

linux-m.n.y-queue

This branch contains the revisions of the rt patch queue -
patches and series file.

Known issues:

- My AMD box throws a lot of "cpufreq_stat_notifier_trans: No
policy found" warnings after boot. It is gone after manually
setting the policy (to something else than reported).

- bcache is disabled.

- CPU hotplug works in general. Steven's test script however
deadlocks usually on the second invocation.

- xor / raid_pq
I had max latency jumping up to 67563us on one CPU while the next
lower max was 58us. I tracked it down to module's init code of
xor and raid_pq. Both disable preemption while measuring the
performance of the individual implementation.

The git URLs for this release are

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-rebase
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-patches

The RT patch against 4.1.2 can be found here:

https://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.2-rt1.patch.xz

The split quilt queue is available at:

https://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patches-4.1.2-rt1.tar.xz

Sebastian


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