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

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2016年10月06日 20:52, Jan Beulich wrote:
>>>> On 30.09.16 at 04:19, <tianyu.lan@xxxxxxxxx> 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?

> 
> 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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