Re: [Resend PATCH 1/2] Xen/Keyhandler: Make keyhandler always run in tasklet

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Sat, Oct 08, 2016 at 11:26:44AM +0800, Lan Tianyu wrote:
> On 2016年10月06日 20:52, Jan Beulich wrote:
> >>>> On 30.09.16 at 04:19, <tianyu.lan@intel.com> wrote:
> >> @@ -87,10 +89,10 @@ void handle_keypress(unsigned char key, struct cpu_user_regs *regs)
> >>      if ( key >= ARRAY_SIZE(key_table) || !(h = &key_table[key])->fn )
> >>          return;
> >>  
> >> -    if ( !in_irq() || h->irq_callback )
> >> +    if ( h->irq_callback )
> > 
> > Please make subject/description reflect this: You don't _always_
> > force the use of the tasklet.
> 
> Ok. I also find register_irq_keyhandler() isn't called anywhere in
> current code and that means none uses irq_callback. Can we remove it?

But it is. See IRQ_KEYHANDLER
> 
> > 
> > And then I don't think we want the debugkey sysctl get processed
> > asynchronously - the sysctl should complete only when the key has
> > been fully handled, in order to not interfere with a subsequent one
> > (namely the one retrieving the log buffer).
> 
> We may introduce a new parameter for handle_keypress() to specify
> whether it should schedule a tasklet to run keyhandler or not. For
> sysctl case, it should be the later one.
> 
> -- 
> Best regards
> Tianyu Lan

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