[PATCH] x86-64 merge

[PATCH] x86-64 merge

Mainly lots of bug fixes and a few minor features. One change is that
it uses drivers/Kconfig now like i386. This requires a few minor changes in
outside Kconfig files which I am sending separately.

 - Tighten/fix some code in NUMA node discovery
 - Fix oopses in threaded 32bit coredumps and read correct registers.
 - Merge with 2.6.2rc1
 - Sync arch/x86_64/Kconfig with i386. Uses drivers/Kconfig now.
 - Remove bcopy export
 - Fix check for signal stack for 32bit signals
 - Fix bcopy and exit prototypes for gcc 3.4
 - Fix asm contraint in usercopy.c for gcc 3.4
 - Use rt_sigreturn, not sigreturn for rt sigreturns.
 - Pass si_fault address to 32bit
 - Truncate si_error to 16bit in 32bit emulation to match i386
 - Move IA32 flag switching for 32bit executables to flush_thread
   (code copied from ppc64/sparc64)
 - Print exception trace for strace too, share code.
 - Default to 3GB address space for a.out executables
 - Fix security hole in ptrace. Also fixes some problems with 32bit gdb.
 - Sync mmap address selection algorithm with mm/mmap.c version
 - Disable a.out coredumps completely
 - Fix bug in sigaltstack 32bit emulation. Kylix IDE now works.
 - Move errata 93/BIOS workaround into fault handler.  This should work
   around USB legacy BIOS bugs too, although not completely (we cannot fix
   faults injected by SMM into user space 64bit processes)
 - Quieten some unimplemented 32bit syscall warnings and avoid repeated
   warnings.
 - Set LDT segment limit correctly (fixes problems with some modify_ldt
   user)
 - Remove obsolete ldt rw lock.
 - Remove sys32_modify_ldt. The standard sys_modify_ldt is equivalent.
 - Remove traces of old kgdb support
 - Merge CFI changes from Jim Houston and some other smaller changes The
   kernel assembly functions are described with dwarf2 unwind
   information now, which makes it easier for debuggers to make sense of
   stack backtraces.  The code is only enabled with CONFIG_DEBUG_INFO.
   Note this implies that when you use CONFIG_DEBUG_INFO you may need
   an binutils update.
 - defconfig updated
 - Readd sleep support code (Pavel Machek)
 - Drop fusion and flush workarounds from IOMMU code
 - Add iommu=nofullflush option
 - Rewrite 32bit emulation for siginfo conversion (Joe Korty)
 - Allow remapping of scatterlists after unmap. This fixes some problems
   with the SCSI layer retrying previously mapped sg lists when iommu
   merging was enabled (it's disabled now by default)
 - Port HPET rtc device emulation code from i386