memory barriers in bus_dmamap_sync() ?

[Scott Long]

On Jan 11, 2012, at 10:00 AM, Ian Lepore wrote:

> 
> I've wished (in the ARM world) for the ability to sync a portion of a
> map.  I've even kicked around the idea of proposing an API extension to
> do so, but I guess if FreeBSD went out of its way to remove that
> functionality that idea probably won't fly. :)

It's been discussed numerous times since mips and arm became relevant in FreeBSD, and I'm frankly surprised that it hasn't happened yet.  Go forth and code, it won't be opposed.

Scott