Quieten down compiler warnings, and fix an off-by-one bug when
deciding whether to include the next word.

Converted to true 4levels.  The address space per process is expanded to
47bits now, the supported physical address space is 46bits. 

Lmbench fork/exit numbers are down a few percent because it has to walk
much more pagetables, but some planned future optimizations will
hopefully recover it.

See Documentation/x86_64/mm.txt for more details on the memory map.
Signed-off-by: Andi Kleen <ak@suse.de>

Converted to pud_t by Nick Piggin.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Convert ia64 architecture over to handle 4 level pagetables.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

i386 works with 2 and 3 levels
Signed-off-by: Andi Kleen <ak@suse.de>

Converted to use pud_t by Nick Piggin
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Add a temporary "fallback" header so architectures can run with the 4level
patgetables patch without modification. All architectures should be
converted to use the folding headers (include/asm-generic/pgtable-nop?d.h)
as soon as possible, and the fallback header removed.

Make all architectures include the fallback header, except i386, because that
architecture has earlier been converted to use pgtable-nopmd.h under the 3
level system, which is not compatible with the fallback header.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Extend the Linux MM to 4level page tables.

This is the core patch for mm/*, fs/*, include/linux/*

It breaks all architectures, which will be fixed in separate patches.

The conversion is quite straight forward.  All the functions walking the page
table hierarchy have been changed to deal with another level at the top.  The
additional level is called pml4. 

mm/memory.c has changed a lot because it did most of the heavy lifting here.
Most of the changes here are extensions of the previous code.  
Signed-off-by: Andi Kleen <ak@suse.de>

Converted by Nick Piggin to use the pud_t 'page upper' level between pgd
and pmd instead of Andi's pml4 level above pgd. 
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Generic headers to fold the 4-level pagetable into 3 levels.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Rename clear_page_tables to clear_page_range. clear_page_range takes byte
ranges, and aggressively frees page table pages. Maybe useful to control
page table memory consumption on 4-level architectures (and even 3 level
ones).

Possible downsides are:
- flush_tlb_pgtables gets called more often (only a problem for sparc64
  AFAIKS).

- the opportunistic "expand to fill PGDIR_SIZE hole" logic that ensures
  something actually gets done under the old system is still in place.
  This could sometimes make unmapping small regions more inefficient. There
  are some other solutions to look at if this is the case though.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Split copy_page_range into the usual set of page table walking functions.
Needed to handle the complexity when moving to 4 levels.
Signed-off-by: Andi Kleen <ak@suse.de>

Split out from Andi Kleen's 4level patch by Nick Piggin.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Adapt the i386 architecture to use the generic 2-level folding header.
Just to show how it is done.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Generic headers to fold the 3-level pagetable into 2 levels.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Add parentheses to x86-64's pgd_index's arguments
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This still leaves "pushf" able to see that somebody is
single-stepping us, but that is at least something you
can work around.

This should fix Wine for some games that otherwise
seem to think that they run under a debugger.

and use that for system call single-step events.

This one also gets the user mode test right, and makes sure
the siginfo is not leaking any stack contents.

macro to use the right address space.

Reported by Joseph Fannin during -mm, revert incorrect change.
Signed-off-by: Dave Airlie <airlied@linux.ie>

Allow drivers to override reclaim_buffers in an OS-independent 
way by passing drm_device_t* as first parameter, like in the
BSD version.

From: Felix Kuehling <fxhuehl@gmx.de>
Signed-off-by: Dave Airlie <airlied@linux.ie>

From: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

From: Keith Withwell <keithw@tungstengraphics.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

sparse complains about them:
drivers/char/drm/sis_ds.h:88:12: warning: dubious one-bit signed bitfield
drivers/char/drm/sis_ds.h:89:16: warning: dubious one-bit signed bitfield
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

into starflyer.(none):/foo/airlied/bitkeeper/drm-latest

From: Stefan Dirsch <sndirsch@suse.de>
Signed-off-by: Dave Airlie <airlied@linux.ie>

into starflyer.(none):/foo/airlied/bitkeeper/drm-latest

into ppc970.osdl.org:/home/torvalds/v2.6/linux

Patch from Deepak Saxena

Patch adds implementation details for IXP46x CPUs and new IXDPG465
reference platform. 

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

Patch from Deepak Saxena

Supersedes 2226/1

According to the IXP Programmer's Reference Manual, a read from
IRQ_STATUS can only return '1' for IRQ sources that have been
explicitly enabled in IRQ_ENABLE. So if we never enable 'invalid'
IRQ sources, we don't actually have to mask off IRQ_STATUS with
IXP2000_VALID_IRQ_MASK.

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

into ppc970.osdl.org:/home/torvalds/v2.6/linux

From: Jason Gaston <jason.d.gaston@intel.com>

This patch adds the Intel ICH7 DID's to the pci_ids.h file
and updates the piix driver and related files for PATA support.

bart: this patch also adds PIRQ support
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

- nothing clever here: the most noticeable change is the change of
  returned value for (*init_setup) in struct ide_pci_device_s which
  goes from void to int. Anything else is editing and checking for
  errors in the output of the compiler;
- pci_disable_device() added for the error path in pci_init_sgiioc4();
- BUG() removed in amd74xx_probe(): good old printk() is enough.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

- no need to overwrite the status code returned by the pci_xyz() functions;
- jump into the new century and use DMA_32BIT_MASK;
- misc cleanup in the error paths. It should not add a huge value in
  ide_pci_enable() due to the FIXME comment but it should not bite too hard
  either.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

ide_setup_pci_controller() puts the device in a PCI enabled state.
The patch adds a small helper to balance it when things go wrong.

Actually the helper does not *exactly* balance the setup: if it can
not do a better job, ide_setup_pci_controller() may only enable some
BARS whereas the new counterpart will try to disable everything.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

- Change the return value and the prototype of do_ide_setup_pci_device
  Due to lack of appropriate return status code, the current clients of
  do_ide_setup_pci_device() can not distinguish a failing invocation
  from a successfull one. The patch modify do_ide_setup_pci_device() so
  that it can propagate some of the errors from the lower layers.

- Make ide_setup_pci_device() aware of the change and propagate the news
  itself. I only gave a quick sight to create_proc_ide_interfaces() (and
  ide_remove_proc_entries()) but they do seem sane and it should not matter
  if it fails or not.

- ide_setup_pci_devices(): mostly the same thing than ide_setup_pci_device().
  do not look trivially suspect.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

From: Alan Cox <alan@redhat.com>

This patch updates ide/pci/generic.c to fix the incorrect returns
causing PCI devices to be left reserved wrongly by the driver.

From: Francois Romieu <romieu@fr.zoreil.com>

Use -ENODEV instead of -EAGAIN.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

From: Alan Cox <alan@lxorguk.ukuu.org.uk>

Several IDE drivers return positive values as errors in the PCI setup
code. Unfortunately the PCI layer considers positive values as success
so the driver skips the device but still claims it and things then go
downhill.

This fixes the IT8172 driver.

From: Francois Romieu <romieu@fr.zoreil.com>

Use -ENODEV instead of -EAGAIN.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

This fixes a build failure that happens when you don't select IPV6.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

DMA should be already released by ide_unregister()
(unless interface is still busy).
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

/proc interface entries should be already unregistered
by ide_unregister() (unless interface is still busy).
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>