Re: [Xen-devel] ns16550.c's poll_port variable

[Keir Fraser <keir@xxxxxxx>]

On 04/05/2012 12:05, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

>> I'm unclear on exactly what you want to optimise away? Certainly the 8 bytes
>> per CPU of the poll_port variable isn't worth much optimising effort.
> 
> Certainly not (and as you say they are actually needed, even if
> only rarely). But the pointlessly running timer(s) might be, as might
> the buffer(s) set up via serial_async_transmit().

We could delay {init,setup}_postirq until a corresponding serial handle has
been created via serial_parse_handle()? The logic might be a bit ugly and
spread across both serial.c and ns16550.c but not actually particularly
complicated?

 -- Keir




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