And here all the other x86-64 changes that have accumulated in my tree.

It's various bugfixes and cleanups.

Changes:

 - fix nmi watchdog
 - remove local timer spreading over CPUs - it's useless here and caused many problems
 - New offset.h computation from Kai
 - Lots of changes for the C99 initializer syntax
 - New MTRR driver from Dave & Mats
 - Bugfix: kernel threads don't start with interrupts disabled anymore, which fixes
   various boottime hangs (this was fixed a long time ago, but the bug crept in again
   by the backdoor)
 - Do %gs reload in context switch lockless
 - Fix device_not_available entry point race
 - New per CPU GDT layout following i386: the layot is not completely
   compatible with i386, which may problems with Wine in theory.
   Haven't seen any yet.
 - Support disableapic option
 - driverfs support removed for now because it caused crashes
 - Updates for new signal setup
 - Support for kallsyms
 - Port TLS clone flags/syscalls: unfortunately made the context switch
   even uglier than it already is.
 - Security fixes for ptrace
 - New in_interrupt()/atomic setup ported from i386
 - New makefiles mostly from Kai
 - Various updates ported from i386

x86_64 core updates.

 - Make it compile again (switch_to macros etc., add dummy suspend.h)
 - reenable strength reduce optimization
 - Fix ramdisk (patch from Mikael Pettersson)
 - Some merges from i386
 - Reimplement lazy iobitmap allocation.  I reimplemented it based
   on bcrl's idea.
 - Fix IPC 32bit emulation to actually work and move into own file
 - New fixed mtrr.c from DaveJ ported from 2.4 and reenable it.
 - Move tlbstate into PDA.
 - Add some changes that got lost during the last merge.
 - new memset that seems to actually work.
 - Align signal handler stack frames to 16 bytes.
 - Some more minor bugfixes.

Here is the big 2.5.21 x86-64 sync patch. It only touches arch/x86_64
and include/asm-x86_64. It requires a few other changes that I'm sending
in separate mail.

Changes:
- merge wit 2.5.21
- merge from 2.5.21/i386 (new PCI code, new LDT code etc.)
- sync with 2.4-x86_64 tree.
- minor updates to 32bit emulation
- better early console; including serial support.
- now set up dummy PDA for booting to avoid problems
- Fix GS reloading in context switch one instruction race
- Remove hardcoded names from mpparse code
- Fix inline assembly for RAID-5 xor (similar change needed for i386)
- Real per cpu data support based on PDA field
- Cleanup of offset.c generation requested by Kai: it only puts structure
  offsets into offset.h now.
- Fix i387 fxsave signal frame problems.
- Add uname emulation via personality ("linux32")
- New SSE optimized checksum-copy, copy*user, memcpy, clear_page, copy_page
  functions. Other tunings/cleanups in checksum and other user memory
  access function.
- check if exception table is really sorted
- Cleanups in page table handling in preparation of non executable pages
  support.
- Cleanup PDA access to not require offset.h (thanks to kai for kicking me
  to this)
- use long long for u64/s64 to avoid more warnings
- remove CONFIG_ISA
- fix various bugs and other cleanups

This patch brings 2.5.8 in sync with the x86-64 2.4 development tree again
(excluding device drivers)

It has lots of bug fixes and enhancements. It only touches architecture
specific files.

- Sync with 2.5.8
- SMP/APIC supported now.
- Module loading works now.
- Time keeping bugs fixed.
- entry.S streamlined and some bugs fixed.
- modify_ldt works now
- mostly rewritten FPU support (including FXRSTOR for initial FPU
  initialization based on the initial state)
- 32bit emulation enhanced and bugs fixed.
- rewrote mm initialization and lots of cleanups in the page table handling
  __PAGE_OFFSET is now moved to 0x10000000000 and some vmalloc/ioremap
  problems have been fixed. They have an own PML4 slot now.
- WCHAN reporting support for RIP (but not RSP)
- Lots of various other bug fixes and cleanups.

Currently broken:
- ACPI
- MTRR

It needs some other bugfixes outside architecture specific code. I sent
them all in separate mail.

This patch makes x86-64 compile in 2.5.5 and syncs it with changes in the i386
port. It also fixes some bugs that were discovered in recent testing:
- enhance 32bit emulation and fix bugs.
- fix security hole in vmalloc handling
- Do not use lockless gettimeofday for now because it is buggy.
The patch only changes x86_64 specific files.

-Andi

This adds the x86_64 arch and asm directories and a Documentation/x86_64.

It took a bit longer because I first had to make preemption and thread_info
work and also found some other bugs while doing this. The port has been
tested for a long time on UP.

I'm not sure what I should describe.  A lot is based on i386 with
a lot of cleanups. I wrote a paper about it for last year's OLS that describes
most of the changes (ftp://ftp.firstfloor.org/pub/ak/x86_64.ps.gz). It is
a bit outdated now, but should give a good overview.

It currently has a completely cut'n'pasted from others+hacked 32bit
emulation. I hope to clean that up in the future by merging the generic
core of this with other 64bit archs.

Thanks,
-Andi

- Asit Mallick: mtrr update
- Patrick Mochel: split up kernel/device.c into drivers/base
- Mikael Pettersson/Al Viro: fix missing in-core inode initialization
in ext2 introduced by Al's inode trimming
- David Miller: sparc and network updates
- Frank Davis: firewire video mmap page remapping fix
- me: fix configure help scripts to fix breakage noticed by Dave Jones
- Greg KH: USB updates
- Kai Germaschewski: ISDN fixes, Config.help entries
- Douglas Gilbert: SCSI doc update
- Ingo Molnar: x86 taskswitch optimizations, scheduler updates
- Mikael Pettersson: make APIC work on old external setups
- Al Viro: more inode trimming

- David Howells: abtract out "current->need_resched" as "need_resched()"
- Frank Davis: ide-tape update for bio
- various: header file fixups
- Jens Axboe: fix up bio/ide/highmem issues
- Kai Germaschewski: ISDN update
- Tim Waugh: parport update
- Patrik Mochel: initcall update
- Greg KH: USB and Compaq PCI hotplug updates

- Kai Germaschewski: ISDN updates
- Al Viro: start moving buffer cache indexing to "struct block_device *"
- Greg KH: USB update
- Russell King: fix up some ARM merge issues
- Ingo Molnar: scalable scheduler

  - Anton Altaparmakov: NTFS error checking
  - Johannes Erdfelt: USB updates
  - OGAWA Hirofumi: FAT update
  - Alan Cox: driver + s390 update merge
  - Richard Henderson: fix alpha sigsuspend error return value
  - Marcelo Tosatti: per-zone VM shortage
  - Daniel Phillips: generic use-once optimization instead of drop-behind
  - Bjorn Wesen: Cris architecture update
  - Anton Altaparmakov: support for Windows Dynamic Disks
  - James Washer: LDT loading SMP bug fix