Messages in this thread | | | Date | Sat, 22 Aug 2020 14:32:52 +0200 | From | peterz@infradea ... | Subject | Re: [BUG RT] dump-capture kernel not executed for panic in interrupt context |
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On Fri, Aug 21, 2020 at 05:03:34PM -0400, Steven Rostedt wrote:
> > Sigh. Is it too hard to make mutex_trylock() usable from interrupt > > context? > > > That's a question for Thomas and Peter Z.
You should really know that too, the TL;DR answer is it's fundamentally buggered, can't work.
The problem is that RT relies on being able to PI boost the mutex owner.
ISTR we had a thread about all this last year or so, let me see if I can find that.
Here goes:
https://lkml.kernel.org/r/20191218135047.GS2844@hirez.programming.kicks-ass.net
Kexec even gets mentioned:
https://lkml.kernel.org/r/20191219090535.GV2844@hirez.programming.kicks-ass.net
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