[ANNOUNCE] 4.4.12-rt19
Dear RT folks!
I'm pleased to announce the v4.4.12-rt19 patch set. I'm doing this
release mostly due the preemption check fix on non x86 architectures and
the perf/rapl patch.
Changes since v4.4.12-rt18:
- On return from interrupt on ARM we could schedule with lazy preempt
count > 0 under some circumstances. It isn't toxic but it shouldn't
happen. Noticed by Thomas Gleixner.
- The way the preempt counter is accessed on non-x86 architectures
allowed the compiler to reorder the code slightly. This led to
decrementing the preempt counter, checking for the need resched bit
followed by writing the counter back. An interrupt between the last
two steps will lead to a missing preemption point and thus high
latencies. Patch by Peter Zijlstra.
- It is now ensured that there are no attempts to print from IRQ or
NMI context. On certain events such as hard-lockup-detector we would
attempt to grab sleeping locks.
- The lock used in the perf/rapl driver is now a raw lock. This change
is part of v4.6-rc1 and therefore not mentioned in the v4.6 series.
Carsten Emde asked for this change to become part of v4.4.
Known issues
- CPU hotplug got a little better but can deadlock.
The delta patch against 4.4.12-rt18 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/incr/patch-4.4.12-rt18-rt19.patch.xz
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.4.12-rt19
The RT patch against 4.6.1 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.12-rt19.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.12-rt19.tar.xz
Sebastian
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
13 files changed
tree: 0be191479b4bc14be8c880c6c3aa60257c7a89e8
- patches/
