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powerpc/pci: Remove the stale comments of pci_process_bridge_OF_ranges

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These comments already don't apply to the current code. So just remove
them.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kevin Hao 2013-05-16 20:58:41 +00:00 • committed by Benjamin Herrenschmidt
parent f274ef8747
commit 2798389604
1 changed files with 0 additions and 9 deletions
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9
arch/powerpc/kernel/pci-common.c
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@ -657,15 +657,6 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
* ranges. However, some machines (thanks Apple !) tend to split their
* space into lots of small contiguous ranges. So we have to coalesce.
*
* - We can only cope with all memory ranges having the same offset
* between CPU addresses and PCI addresses. Unfortunately, some bridges
* are setup for a large 1:1 mapping along with a small "window" which
* maps PCI address 0 to some arbitrary high address of the CPU space in
* order to give access to the ISA memory hole.
* The way out of here that I've chosen for now is to always set the
* offset based on the first resource found, then override it if we
* have a different offset and the previous was set by an ISA hole.
*
* - Some busses have IO space not starting at 0, which causes trouble with
* the way we do our IO resource renumbering. The code somewhat deals with
* it for 64 bits but I would expect problems on 32 bits.