The sysfs directory where the cpufreq-related files are stored changed due
to the new device interface code, so the documentation needs to be updated
accordingly. Also, add some information about the reference counting and the
exporting of sysfs files by the drivers.

This patch lets cpufreq drivers export per-CPU files in the cpufreq and
cpu-specific sysfs directory. As an example, a file
"scaling_available_frequencies" is added to the p4-clockmod.c driver.

Intel ICH4-M soutbridges use exactly the same register interface for SpeedStep
as ICH2-M and ICH3-M southbridges -- which makes adding support for this  
bridge (almost) trivial

This patch takes use of the now-working cpufreq_interface.kset and
cpufreq_policy.kobj to use reference counting within the cpufreq core
wherever this is more appropriate than the previous approach -- using one
semaphore. Additionally, the callbacks to the driver modules are protected
now.

- no cpufreq driver uses the frequency table helper "setpolicy" any more
  ("target" is much more appropriate for them anyways) - so remove
  that helper
- all cpufreq drivers use the advanced registration process, so some
  compatibility code can safely be removed. 

Let's put the sysfs file exported by the cpufreq userspace governor also
into the cpufreq/ - subdirectory of /sys/devices/sys/cpu0/.

- update two more cpufreq-related sysfs files to the new interface
  code
- always store the new, user-requested policy in another struct
  cpufreq_policy so that we can safely fall back to the old one in
  case something fails (this equals the behaviour before Pat's patch)
- the kobject which was registered in cpufreq_add_dev was inside a variable
  private to this function -- so the whole cpufreq sysfs interface returned
  -EINVAL.

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

This also shows how to add files to the initramfs build, but is 
commented out.

Patch originally done by Kai.

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

Fix oops in getdfs when null path passed in on mount.  Fix oops when changed readsize caused readpages problem.  Add support for altering rsize so can reduce pages read across net
below default of 4

This fixes the SMP runqueue locking bug when updating the wakers
priority.  It also includes:

 - only update the priority and do a requeueing if the sleep average has
   changed. (this does not happen for pure CPU hogs or pure interactive
   tasks, so no need to requeue/recalc-prio in that case.) [All the
   necessary values are available at that point already, so gcc should
   have an easy job making this branch really cheap.]

 - do not do a full task activation in the migration-thread path - that is
   supposed to be near-atomic anyway.

 - fix up comments

I solved the SMP locking bug by moving the requeueing outside of
try_to_wake_up().  It does not matter that the priority update is not
atomically done now, since the current process wont do anything
inbetween.  (well, it could get preempted in a preemptible kernel, but
even that wont do any harm.)

The following messages are of interest only when debugging aio.
Otherwise, they are just console clutter.

- Remove broken lock accounting
- Introduce __locks_delete_block()
- Stop using kdevname()
- Fix locks_remove_posix()

 - fix a (now-) bug in kernel/softirq.c, it did a wakeup outside any
   atomic regions, which falsely identified random processes as a
   non-atomic wakeup, and which causes random priority boost to be
   distributed.

 - reset the initial idle thread's priority back to PRIO_MAX after doing
   the wakeup_forked_process() - correct preemption relies on this.

 - update current->prio immediately after a backboost.

 - clean up effective_prio() & sleep_avg calculations so that there are
   fewer RT-task special cases.  This has the advantage of the sleep_avg
   being maintained even for RT tasks - this could be advantegous for
   tasks that briefly enter/exit RT mode.

Seems there is a memleak on error exit path in drivers/char/vt.c, here's
the patch.  Found with help of smatch + enhanced unfree script.

__activate_task() and wake_up_forked_process() should call
nr_running_inc(rq) rather than doing a rq->nr_running++.

Noted by Rick Lindsley

The console initcall patch that went in contains a typo that prevents
alpha from building.

The stack reducing patch that recently went in prevent alpha from
building (missing some ELF_CORE_COPY_XFPREGS ifdefs). The excluded
patch fixes it.

This one simply sets TARGET_CPUS to cpu_callout_map instead of
cpu_online_map so that when we finally do boot we actually use the other
cpus for servicing interrupts.

This change was wrong. pfn_to_nid is a macro.

NODE_THRESHOLD got accidentally dropped in the interactive scheduler
changes merge. This puts it back.

Apple PowerBooks want <asm/prom.h> in ohci-pci.c for the prototype of
pci_device_to_OF_node().  This patch adds it to the already present
list of PowerBook specific #includes:

This squashes (gcc-3.2) "label and end of compound statement
deprecated" warnings in usb-serial.c.

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

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

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-core

Make CONFIG_SYSCTL control sys32_sysctl as well.  Based on a patch from Peter Chubb.

From Rusty Lynch:

* makes sysfs cleanup the buffer->data allocated by the attribute write
functions
* fixes a bug that causes the kernel to oops when somebody attempts to
write to the file.

This patch was previously integrated, but dropped erroneously by a bk 
merge. 

This fixes file cleanup during a sysfs directory removal by deleting files
from ->d_subdirs as they're iterated over, then checking if we can get a
reference on them.

Andy Grover told me this should be posted here.  It allows ACPI to
compile even with PCI turned off.  Patch against 2.5.60.

ia 64 part of the patch.  This gives you a 32 bit version of sys_futex (hopefully).

concurrent renames in another directory.

I doubt this can be triggered in practice, and the fix is
a bit heavy-handed, but let's see if numbers can show that
the simple fix doesn't show any real lock contention.

list.h must now include stddef since it uses NULL.