Re: [Xen-devel] [PATCH] Xen: Force non-irq keyhandler to be run in tasklet when receive a debugkey from serial port

["Lan, Tianyu" <tianyu.lan@xxxxxxxxx>]

On 10/24/2016 10:31 PM, Jan Beulich wrote:
> > > > On 24.10.16 at 16:15, <tianyu.lan@xxxxxxxxx> wrote:
> > On 10/24/2016 9:54 PM, Jan Beulich wrote:
> > > > > > On 24.10.16 at 15:29, <tianyu.lan@xxxxxxxxx> wrote:
> > > > On 10/24/2016 8:19 AM, Konrad Rzeszutek Wilk wrote:
> > > > > On Sat, Oct 22, 2016 at 07:23:03PM +0800, Lan Tianyu wrote:
> > > > > > __serial_rx() runs in either irq handler or timer handler and non-irq
> > > > > > keyhandler should not run in these contexts. So always force non-irq
> > > > > > keyhandler to run in tasklet when receive a debugkey from serial port
> > > > > If the machine is hung with an IRQ handler being stuck, and
> > > > > one does 'Ctrl-Ax3` followed by 'C' .. which would not be invoked
> > > > > (as it is not an IRQ handler??
> > > > If serial port's interrupt still works in this case, the 'C'
> > > > keyhandler kexec_crash() will be invoked in a tasklet. This behavior was
> > > > changed by my patches if includes this patch.
> > Sorry. A typo. I meant the behavior wasn't changed by my patches.
> How was it not? The softirq machinery didn't get invoked in that case
> prior to your patch, afaict.
Which softirq? You mean addiing process_pending_softirqs() in the
dump_timerq()?

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