Re: [PATCH 1/3] resource: shared I/O region support

[H. Peter Anvin]

On 03/29/2010 11:39 AM, Alan Cox wrote:
>> What I *really* object to with this patch is that it inherently assumes
>> that there is only one multiplexed resource in the entire system... but
>> of course nowhere enforces that.
> 
> The patch does nothing of the sort. Not unless there is a bug I am not
> seeing anyway. It does assume nobody tries to grab pairs of such
> resources as it doesn't do deadlock avoidance.
> 
> It's now a shared resource patch however, its a multiplexor patch and
> that is precisely why it is called MUX not SHARED or OVERLAY
> Alan

Sorry, I missed the "continue", which of course handles the situation I
was worried about.  The shared wait queue is a bit inelegant, but if it
turns out to be a bottleneck in real life then we either have bigger
problems or it can be addressed at that time.

	-hpa

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