[PATCH 1/9] alpha: Convert mapping routine to rely on physical address

[Magnus Lindholm]

> > Suggest testing the same branch with the alpha patch reverted just to
> > rule out any issue in the core code. If it reproduces suggest to
> > bisect Leon's branch.

Hi again, I've booted up the ES40 again with the kernel build from Leons
branch, it boots up but message log is full off messages like
"EXT4-fs error (device sda4): ext4_find_extent:939: inode
#16257327: comm init: pblk 65114257 bad header/extent:
invalid magic"

The filesystem is broken after just booting with the kernel.
This time fsck did not fix it, I needed to re-install gentoo stage3.
So it's for sure reproducible as well as destructive.  It's not possible to
revert all the commits individually, since this will leave the source tree
in a state where the kernel doesn't build. I've started off by reverting
the following commits:

e78a9d72517a88faa6f16dab4d1c6f966ed378ae
(dma-mapping: remove unused map_page callback)

d459e3b80ad1c81bf596d63d2e3347cf8c7bb0d9
(alpha: Convert mapping routine to rely on physical address)

3cd47242d513050d7a81ac6e7020fd3ef5462ad4
(block-dma: properly take MMIO path)

7950995bef32aa7e5f74699c7d0fdac41d2dad14
 (block-dma: migrate to dma_map_phys instead of map_page)


After reverting the above commits, I'm able to build a working kernel,
that is, no filesystem corruption occurs. I'll take a closer look at this
after the weekend.

Regards

Magnus