release_task can sleep.  Sleeping allows a CPU to go down underneath you.
release_task removes you from the tasklist, so you don't get migrated off the
CPU: BUG() in sched.c.

In last week's episode, our dashing hero (Ingo Molnar) solved this for
self-reaping tasks by grabbing the hotplug cpu lock to prevent this. 
However, in an unexpected twist, the problem remains for tasks whose
parents call release_task on them: the zombies are off the task list, and
lurk on the dead CPU.

Fortunately, the comedic sidekick (Rusty Russell) has an answer: let's make
the hotplug callback walk the runqueue of the dead CPU as well, taking care
of the zombies.

1) Restore exit.c to its former form.  The comment is incorrect: sched.c
   checks PF_DEAD, not the state, to decide to do the final
   put_task_struct(), and it does it for all tasks, self-reaping or no.

2) Implement migrate_dead_tasks() in the sched.c hotplug CPU callback.

3) Rename migrate_all_tasks() to migrate_live_tasks().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

A followup patch wants to do forced migration, so separate that part of the
code out of migrate_all_tasks().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

md currently uses csum_partial to calculate checksums for superblocks.
However this function is not consistent across all architectures.  Some
(i386) to a 32bit csum.  Some (alpha) do a 16 bit csum.  This makes it hard
for userspace to keep up.

So we provide a generic routine (that does exactly what the i386
csum_partial does) and:

- When setting the csum, use csum_partial so that old kernels will still
  recognise the superblock

- When checking the csum, allow either csum_partial or the new generic
  code to provide the right csum.  This allows user-space to just use the
  common code and always work.

Also modify the csum for version-1 superblock (which currently aren't being
used) to always user a predictable checksum algorithm.

Thanks to Mike Tran <mhtran@us.ibm.com> for noticing this.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

In porting the sn_console driver to the serial core, we lost sysrq support.
 This patch fixes it and removes a few unncessary #ifdefs.  Can you please
send it on to Linus asap?  sysrq is a *really* nice thing to have.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Dave Hansen recently did some bootmem and paging init cleanups, but I
missed this little bit when I tested his original patches.  We need to
initialize pgdat->node_mem_map correctly since a) we're using vmem_map, and
b) the core won't do it for us since we have a valid node_start_pfn I
believe.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This avoids lots of bothersome memory management and is generally
cleaner. 
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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

into kernel.bkbits.net:/home/davem/net-2.6

into kernel.bkbits.net:/home/davem/sparc-2.6

Render left to right instead of top to bottom.
This shaved a whole second off the:
	time cat MAINTAINERS
benchmark.
Signed-off-by: David S. Miller <davem@redhat.com>

- copyarea checking of src/dst y being equal was buggy.
- set optimal FBINFO flags for this device.
Signed-off-by: David S. Miller <davem@redhat.com>

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

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

into kroah.com:/home/greg/linux/BK/usb-2.6

Rusty decided to preprocess a *.lds.S file in parallele with the new *.lds infrastructure
being added to kbuild. Fix that up.
Also added the file to targets so we do not see recompile each time the kernel is build.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

A bug that slipped through when introducing Makefile.host.
A good way to check if people actually uses make O= ;-)
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Gadgetfs updates:

 - Resolve a problem that came from a change in the API to AIO:
   kiocb->private type and size changed, but the name remained
   the same ... so GCC wouldn't report pending memory-corruption.

 - Probe the controller at runtime, eliminatingting config-specific
   defines which need to be updated for each new controller.  Rip
   out the old #defines.

 - Use newish APIs to let VBUS current be used to recharge
   batteries (or whatever).

 - Use no_llseek() ... endpoints are pure data streams.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Fix tty layer sleep/locking problem (again) ... when this is
called through the network stack (PPP) sleeping isn't allowed.
There's some bugtraq ID for this.

From: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Higher layers call set_mctrl if necessary.
Signed-off-by: David S. Miller <davem@redhat.com>

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

Patch from: Linus Torvalds

Update ARM signal handling for Andrew's series of fixes.

Signed-off-by: David S. Miller <davem@redhat.com>

This patch gets rid of the tcp_default_win_scale sysctl and instead
computes the optimum maximum window scale.  It just means one less
thing to have to tune.  I also moved the code out of the inline because
it gets called three places and isn't in the critical path.

As a side effect, it will cause a smaller window scale for many people
since the default tcp_rmem fits in a win_scale of 2.  This is allows for
finer grain windows (good), but may mask some of the problems with bad
implementations we have already seen (bad).
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>

Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: David S. Miller <davem@redhat.com>

into nuts.davemloft.net:/disk1/BK/sparc-2.6

The previous workaround didn't enable the BTIC bit on CPUs where it is
broken.  However, it seems some firmwares will unconditionally set it,
so this new patch will actually _clear_ it on CPUs where it is broken.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Recent yenta_socket (and maybe others) rely on some pcibios_* functions
to be available to modules.  This exports them.

The trackpad on recent Apple laptops tend to emmit spurrious 'right
clicks' apparently.  This patch from Alex Clausen fixes it, please
apply.  The trackpad cannot normally emit a right click, so just filter
those out.
Signed-off-by: Alexander Clausen <alex@skip86.com>
Signed-off-by: Michael Schmitz <schmitz@opal.biophys.uni-duesseldorf.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

msnd #defined outb to outb_p, which wasn't a good idea on platforms
that had outb_p #defined to outb ;-)
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

qd65xx assumed that char is always signed
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

"v" and "r" are not good names for variables local in macro...
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

That was a nasty one - missing include of config.h in a file that has
non-trivial ifdefs.  With some configs it ended up with very odd conflicts
(we get included early, take the wrong branch of ifdef, then get another
file included, it pulls in config.h and picks the right branch of its
ifdef; surprise, surprise, they conflict).
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arm forgot to export memchr(); everybody else does export it and it's used
in modules.
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>