From: Rick Jones <redacted>
Date: Mon, 14 Aug 2006 10:42:55 -0700
Now, PA-RISC CPUs have the ability to disable spaceid hashing, and it is
entirely possible that the PA-RISC linux port does that, but I thought I
would mention it as an example. I'm sure the "official" PA-RISC linux
folks can expand on that much much better than I can.
Regardless, the "offset" it usually taken care of transparently
by the kernel in order to avoid cache aliasing issues.
It is definitely something we'll need to deal with for zero-copy
I/O using NTA. We'll have to make sure that the user mapping of
the page is of the same color as the mapping the kernel uses.