Re: [PATCH 3.14.25-rt22 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at kernel/locking/rtmutex.c:997!

From: Sebastian Andrzej Siewior
Date: Mon Mar 09 2015 - 12:49:19 EST

On 03/09/2015 05:36 PM, Steven Rostedt wrote:
> BTW, I'm going to start with 3.18-rt1 and see what's been added to the
> other -rt updates. If there's something I need that was added to
> 3.18-rt1 can you let me know. That is, if it wasn't marked with a
> stable-rt tag. My scripts will find those.

I tried to create new patch files for new things and mark them stable
where possible.
I didn't mark the "simple-work" (a workqueue based on swait to avoid a
new kernel thread for each of those things where we need to schedule a
workqueue or something like that from atomic context, like MCE) with cc

The patch where I reverted this timer thingy is

and it was due to hrtimer beeing broken on 3.18 and has no stable tag.

I'm not sure about the multi-queue block stuff (*-mq-* in the queue).
You might want take a look. I updated a few patches because I managed
to create deadlocks. I'm not sure if it was possible deadlock in v3.14
and I simply didn't trigger if the code changed and it become possible.
I remember that the multi queue block code entered v3.12 but was unused
and started with v3.14 it gained a user.

> -- Steve

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