* is magic-sysrq handling threaded in linux-RT?
@ 2019-07-02 16:04 Chris Friesen
2019-07-03 11:24 ` Sebastian Andrzej Siewior
0 siblings, 1 reply; 2+ messages in thread
From: Chris Friesen @ 2019-07-02 16:04 UTC (permalink / raw)
To: linux-rt-users
I'm trying to debug an issue on a kernel with the RT patches, and it's
causing a hang where magic-sysrq does not work.
I'd like to clarify something though...is the serial console interrupt
threaded? If it is, then something that prevents the scheduler from
running could result in magic-sysrq not functioning, but if it isn't
then I think that would point to an interrupt problem.
Anyone know for sure?
Thanks,
Chris
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: is magic-sysrq handling threaded in linux-RT?
2019-07-02 16:04 is magic-sysrq handling threaded in linux-RT? Chris Friesen
@ 2019-07-03 11:24 ` Sebastian Andrzej Siewior
0 siblings, 0 replies; 2+ messages in thread
From: Sebastian Andrzej Siewior @ 2019-07-03 11:24 UTC (permalink / raw)
To: Chris Friesen; +Cc: linux-rt-users
On 2019-07-02 10:04:49 [-0600], Chris Friesen wrote:
> I'd like to clarify something though...is the serial console interrupt
> threaded? If it is, then something that prevents the scheduler from running
> could result in magic-sysrq not functioning, but if it isn't then I think
> that would point to an interrupt problem.
The interrupt is threaded, the magic-sysrq happens threaded then. Any
printk in non-preemptible region will be delayed until preemptible
region is reached (or delayed until the next print from preeptible
region).
> Thanks,
> Chris
Sebastian
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