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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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.

Jan

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