writeback for ring read pointer (Paul Mackerras)
* Get rid of some superfluous stuff, minor fixes

Don't ioremap the framebuffer area. The ioremapped area wasn't used by
anything.

- Tie the DRM to a specific device: setunique no longer succeeds when given
a busid that doesn't correspond to the device the DRM is attached to. This
is a breaking of backwards-compatibility only for the multiple-DRI-head case
with X Servers that don't use interface 1.1.
- Move irq_busid to drm_irq.h and make it only return the IRQ for the current
device. Retains compatibility with previous X Servers, cleans up unnecessary
code. This means no irq_busid on !__HAVE_IRQ, but can be changed if
necessary.
- Bump interface version to 1.2. This version when set signifies that the
control ioctl should ignore the irq number passed in and enable the
interrupt handler for the attached device. Otherwise it errors out when
the passed-in irq is not equal to the device's.
- Store the highest version the interface has been set to in the device. 

- Move IRQ functions from drm_dma.h to new drm_irq.h and disentangle them from
__HAVE_DMA. This will be useful for adding vblank sync support to sis and
tdfx. Rename dma_service to irq_handler, which is more accurately what it is.
- Fix the #if _HAVE_DMA_IRQ in radeon, r128, mga, i810, i830, gamma to have
the right number of underscores. This may have been a problem in the case
that the server died without doing its DRM_IOCTL_CONTROL to uninit

This updates the driver from version 2.4.0->2.5.0, adding
the CCM_FLIP command.

 - Pass in the "device" to remapping functions
 - add radeon CP resume ioctl
 - remove warnings and stale DMA debug code

DMA histogramming. Be more careful about DMA page-list allocations,
and remove old and broken (not SMP-safe, and unused) DRM read(), write()
and poll() support.

This adds support for i830 interrupt handling, and new improved
lock context keying. See per-file comments for more detail, as this
commit sadly mixes up a few different things (that's what you get
for not tracking the changes at a fine enough granularity).

Moved AGP and DRM code back to drivers/char until a proper solution is done for handling AGP/DMA based framebuffer devices.

The last of the console code inside the frmaebuffer layer. I also moved all the graphics related code into the drivers/video directory.

Some day gcc may drop support for __FUNCTION__ entirely, we'll
just add a #define __FUNCTION__ __func__ at that point. In the
meantime, gcc-3.x warns about pasting __FUNCTION__, so don't do it.

  - Jeff Hartmann: DRM AGP/alpha cleanups
  - Ben LaHaise: highmem user pagecopy/clear optimization
  - Vojtech Pavlik: VIA IDE driver update
  - Herbert Xu: make cramfs work with HIGHMEM pages
  - David Fennell: awe32 ram size detection improvement
  - Istvan Varadi: umsdos EMD filename bug fix
  - Keith Owens: make min/max work for pointers too
  - Jan Kara: quota initialization fix
  - Brad Hards: Kaweth USB driver update (enable, and fix endianness)
  - Ralf Baechle: MIPS updates
  - David Gibson: airport driver update
  - Rogier Wolff: firestream ATM driver multi-phy support
  - Daniel Phillips: swap read page referenced set - avoid swap thrashing

  - Rui Sousa: emu10k1 module fixes, remove joystick part.
  - Alan Cox: driver merges
  - Andrea Arkangeli: alpha updates
  - David Woodhouse: up_and_exit -> complete_and_exit
  - David Miller: sparc and network update
  - Andrew Morton: update 3c59x driver
  - Neil Brown: NFS export VFAT, knfsd cleanups, raid fixes
  - Ben Collins: ieee1394 updates
  - Paul Mackerras: PPC update
  - me: make sure we don't lose position bits in "filldir()"

  - me: sane and nice VM balancing
  - Jeff Hartmann: upgrade DRM to XF86 4.1.x, drop support for 4.0.x