Re: [PATCH 10/13] xen/pvticket: allow interrupts to be enabled whileblocking

[Jeremy Fitzhardinge]

On 09/02/2011 07:48 AM, Peter Zijlstra wrote:
> On Thu, 2011-09-01 at 17:55 -0700, Jeremy Fitzhardinge wrote:
>> +       /* Make sure an interrupt handler can't upset things in a
>> +          partially setup state. */
>>         local_irq_save(flags);
>>  
>> +       /*
>> +        * We don't really care if we're overwriting some other
>> +        * (lock,want) pair, as that would mean that we're currently
>> +        * in an interrupt context, and the outer context had
>> +        * interrupts enabled.  That has already kicked the VCPU out
>> +        * of xen_poll_irq(), so it will just return spuriously and
>> +        * retry with newly setup (lock,want).
>> +        *
>> +        * The ordering protocol on this is that the "lock" pointer
>> +        * may only be set non-NULL if the "want" ticket is correct.
>> +        * If we're updating "want", we must first clear "lock".
>> +        */
>> +       w->lock = NULL; 
> I mean, I don't much care about Xen code, but that's two different
> comment styles.

Yeah, that's the "two line comment style" next to "big block comment"
style - but you're right they look pretty bad juxtaposed like that.

    J

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/