Re: kmap_atomic_pfn for PCI BAR access?

[Dave Airlie]

> >   
> 
> Anything that does any kind of pagetable manipulation needs to do tlb flushes.
> kunmap_atomic handles the flushing.

It doesn't however need to do an IPI dance which is the worst part of 
doing a tlb flush on SMP machines.

flushing local CPU tlbs is bad, but doing IPIs and waiting for everyone 
else is brutal.

Dave.
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