Re: PCI DMA to small buffers on cache-incoherent arch

[Oliver Neukum]

> > So is the consensus now that in general drivers should make sure any
> > buffers passed to pci_map/unmap are aligned to SMP_CACHE_BYTES (and a
> > multiple of SMP_CACHE_BYTES in size)?  In other words if a driver uses
> > an unaligned buffer it should be fixed unless we can prove (and
> > document in a comment :) that it won't cause problems on an arch
> > without cache coherency and with a writeback cache.
>
> And how about we don't call it SMP_CACHE_BYTES too?  The processors
> where this matters certainly aren't doing SMP...

Definitely we should call it something different so we can limit it to 
architectures that need it.

	Regards
		Oliver