[PATCH V2 0/7] swiotlb: changes for powerpc/highmem

[Becky Bruce <beckyb@kernel.crashing.org>]

This is v2 of a series of fairly minor patches that get swiotlb
working on 32-bit powerpc systems with HIGHMEM, plus some cleanup
of the outdated comments in the code. I've made a couple of things
weak that ppc needs to override, and have changed the prototypes
for a couple of functions to include the hwdev pointer, which
we need to ppc to convert bus addresses to and from phys/virt
addresses. I've also fixed a build warning I've been seeing on
ppc.

In response to commentary on the previous series, I've also
refactored the code a bit, altough I did this slightly
differently than was suggested because I noticed we could use the
new helper function in 2 places instead of one. I've reformatted
a bit of code based on commentary as well.

I have not tested this in any way on any non-ppc platforms,
so commentary/testing from x86/ia64 folks is, once again,
greatly appreciated.

I'm going to be offline for the next week, but will respond to
commentary as soon as I return.

Cheers,
Becky

diffstat:
arch/x86/kernel/pci-swiotlb.c |    2 +-
include/linux/swiotlb.h       |    3 +-
lib/swiotlb.c                 |  115 ++++++++++++++++++++++-------------------
3 files changed, 64 insertions(+), 56 deletions(-)