When ACPI turns the system off on shutdown, it actually enters S5, a sleep
state. This functionality is dependent on CONFIG_ACPI_SLEEP, which is 
dependent on CONFIG_SOFTWARE_SUSPEND.

This patch breaks the power off functionality into a separate file, and 
removes the dependency on the above-mentioned crap. Finally, power off works
for me again. 

Thanks to Tobias Ringstrom for the original patch.

Each power management scheme was implmenting a sysrq callback for 'o' which
would call their respective power off routines. 

This moves the installation of the sysrq handler to kernel/pm.c, and calls
pm_power_off(), which will work for any platform that has that method
defined. 

Recently, the acpi proc files were changed to use the seq_file interface.
As a result of this, the write methods became top-level write() methods
(i.e. not called by the proc layer). 

Whoever made these changes, did not take into account that the parameters 
passed to these changed. The fourth parameter previously was a void*, that
pointed to the private data for the owner of the file, and some of the 
methods still expected this, even though the parameter is now an loff_t*,
and points to the offset into the file that is being written. Huge Bug. 

This fixes the broken methods to look in the same place as the other 
methods (i.e. in the file's private data).
 

- Check if __linux__ is defined in include/acpi/platform/acenv.h, instead
  of -D_LINUX (defined by drivers/acpi/Makefile).
- Remove -D_LINUX from custom CFLAGS.
- Remove include path of include/acpi, since all headers are looked for in
  include/acpi.

- Prevent users from screwing themselves by removing support for entering
  S5 from the proc file. S5 is 'soft-off' and the state the system enters
  when powering down. It needs to be preceded by a proper shutdown sequence
  and should not be triggered manually. 
- Fix a potential unchecked array reference using the written value as the
  index.

Andi has asked that I send these straight forward compatibility patches
to you and he will fix up any merge problems later.  These are the
outstanding patches for x86_64 against 2.5.60.

At Linux Conf AU, Willy asked me to send any further parisc compatibility
changes directly to you, so this is what I have outstanding.  Basically,
it is just the uses of compat_sigset_t that seemed to have been missed in
the previous merges.

This brings the x86-64 port uptodate in 2.5.60. Unfortunately I cannot
test too much because i constantly get deadlocks in exit/wait in initscripts
on SMP bootup. The kernel seems to still lose a lot of SIGCHLD. 2.5.59/SMP
had the same problem. Uniprocessor and SMP kernel on UP seems to work.

This patch only touches x86-64 specific files. It requires a few simple
changes to arch independent files that I will send separately.

 - Fixed a lot of obsolete/misleading configure help texts.
 - Remove old bootblock disk loader and support fdimage target for syslinux
   instead (H. Peter Anvin)
 - Fix potential fpu signal restore problem on 32bit emulation.
 - Merge with 2.5.60 i386 (hugetlbfs, acpi etc.)
 - Some fixes for local apic disabled modus.
 - Beginngs of S3 ACPI wakeup from real-mode (not working yet, don't use)
 - Beginnings of NUMA/CONFIG_DISCONTIGMEM support for AMD K8 (work in progress,
   port from 2.4): clean up memory mapping at bootup, generalize bootmem etc.
 - Fix 64bit GS base reload problem and reenable (Karsten Keil)
 - Fix race with vmalloc accesses from interrupt handlers disturbing page fault/
   similar race for the debug handler (thanks to Andrew Morton)
 - Merge cpu access primitives with i386
 - Revert to private module list for now because putting modules
   nto vmlist triggered too many problems.
 - Some cleanups, removal of unneeded code.
 - Let early __get_free_pages see consistent pda
 - Preempt disabled for now because it is too broken right now
 - Signal handler fixes
 - Fix do_gettimeofday to be completely lockless and reenable vsyscalls
 - Optimize context switch path a bit (should be ported to i386)
 - Get thread_info via stack for better code
 - Don't leak pmd pages
 - Clean up hardcoded task stack sizes.

Since daemonize now blocks all signals, this simplification is trivially
correct.

into home.transmeta.com:/home/torvalds/v2.5/linux

into home.transmeta.com:/home/torvalds/v2.5/linux

into home.transmeta.com:/home/torvalds/v2.5/linux

into tp1.ruhr-uni-bochum.de:/scratch/kai/kernel/v2.5/linux-2.5.make

nfs must not use MINORBITS - that fails with 32-bit dev_t

into kernel.bkbits.net:/home/davem/net-2.5

into kernel.bkbits.net:/home/davem/sparc-2.5

From Chris Wedgwood:

> fixdep doesn't close files when finished with them... normally this
> doesn't matter unless you have strict ulimits in place.
>
> Trivial fix is:

Not that it makes any difference on x86, but there may be
architectures that actually need it.

Add a name argument to daemonize() (va_arg) to avoid all the
kernel threads having to duplicate the name setting over and
over again.

Make daemonize() disable all signals by default, and add a
"allow_signal()" function to let daemons say they explicitly
want to support a signal.

Make flush_signal() take the signal lock, so that callers do
not need to.

Patch from Roland McGrath.

This patch replaces the assumption that > PAGE_OFFSET == kernel address
with testing for user_mode(regs) and inserting switch codes instead.

This patch allows the oprofilefs files to take entry in any base
instead of just base 10

This patch updates the horrible enum for the logical CPU type with a
string instead.

The below patch implements a P4 driver for OProfile, mostly written
by Graydon Hoare.

into home.transmeta.com:/home/torvalds/v2.5/linux

Done by Adam Belay.