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Subject[PATCH RT 0/8] Linux 3.2.53-rt76-rc1

Dear RT Folks,

This is the RT stable review cycle of patch 3.2.53-rt76-rc1.

Note, the reason I did not release this earlier, was that I found
that the v3.2-rt series was locking up with my cpu hotplug stress test.
I finally got some time to debug this, and found that the problem was
in the invalidate_bh_lrs() where it was stuck in the on_each_cpu() call
where it was waiting for an offline CPU. Looking at what 3.4-rt does,
which does not have this problem, there were three patches in mainline
from Gilad Ben-Yossef that appears to fix the issue. At least it
makes the symptom go away. I may look into this deeper to make sure
that we did not just make a race window much harder to hit, and really
did fix the problem. But as 3.2-rt is now as stable as 3.4-rt and later
I can finally release this candidate.

Please scream at me if I messed something up. Please test the patches too.

The -rc release will be uploaded to kernel.org and will be deleted when
the final release is out. This is just a review release (or release candidate).

The pre-releases will not be pushed to the git repository, only the
final release is.

If all goes well, this patch will be converted to the next main release
on 1/17/2014.

Enjoy,

-- Steve


To build 3.2.53-rt76-rc1 directly, the following patches should be applied:

http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.2.tar.xz

http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.53.xz

http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patch-3.2.53-rt76-rc1.patch.xz

You can also build from 3.2.53-rt75 by applying the incremental patch:

http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/incr/patch-3.2.53-rt75-rt76-rc1.patch.xz


Changes from 3.2.53-rt75:

---


Gilad Ben-Yossef (3):
smp: introduce a generic on_each_cpu_mask() function
smp: add func to IPI cpus based on parameter func
fs: only send IPI to invalidate LRU BH when needed

Peter Zijlstra (1):
lockdep: Correctly annotate hardirq context in irq_exit()

Sebastian Andrzej Siewior (2):
swait: Add a few more users
rtmutex: use a trylock for waiter lock in trylock

Steven Rostedt (Red Hat) (1):
Linux 3.2.53-rt76-rc1

Tiejun Chen (1):
cpu_down: move migrate_enable() back

----
arch/arm/kernel/smp_tlb.c | 20 ++-----
arch/tile/include/asm/smp.h | 7 ---
arch/tile/kernel/smp.c | 19 -------
drivers/net/wireless/orinoco/orinoco_usb.c | 2 +-
drivers/usb/gadget/f_fs.c | 2 +-
drivers/usb/gadget/inode.c | 4 +-
fs/buffer.c | 15 ++++-
include/linux/smp.h | 46 +++++++++++++++
include/linux/spinlock_rt.h | 1 +
kernel/cpu.c | 2 +-
kernel/rtmutex.c | 31 ++++++++--
kernel/smp.c | 90 ++++++++++++++++++++++++++++++
kernel/softirq.c | 45 ++++++++++++++-
kernel/timer.c | 2 +-
localversion-rt | 2 +-
15 files changed, 232 insertions(+), 56 deletions(-)


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