Fix a race identified by Jeremy Kerr <jeremy@redfishsoftware.com.au>: if
update_process_times() decides to deliver a signal due to process timer
expiry, it can race with __exit_sighand()'s freeing of task->sighand.

Fix that by clearing the per-process timer state in exit_notify(), while under
local_irq_disable() and under tasklist_lock.  tasklist_lock provides exclusion
wrt release_task()'s freeing of task->sighand and local_irq_disable() provides
exclusion wrt update_process_times()'s inspection of the per-process timer
state.

We also need to deal with the send_sig() calls in do_process_times() by
setting rlim_cur to RLIM_INFINITY.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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

into cantab.net:/home/src/ntfs-2.6

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

Patch from Nicolas Pitre

[patch rediffed]

On PXA27x the memory and LCd clocks are different.
Also clean the PXA27x clock code a bit.

Remove 26-bit ARM region reserves.

All region reserves start at PHYS_OFFSET, and we only ever have one,
so set res_size and reserve the region from PHYS_OFFSET size res_size.
    
Don't free the .init sections on Integrator/CP - they sit in the SSRAM
obscured region so we are unable to use them for DMA purposes.

Ingo explains:

The condition is 'impossible', but the whole balancing code is
(intentionally) a bit racy:

                cpus_and(tmp, group->cpumask, cpu_online_map);
                if (!cpus_weight(tmp))
                        goto next_group;

                for_each_cpu_mask(i, tmp) {
                        if (!idle_cpu(i))
                                goto next_group;
                        push_cpu = i;
                }

                rq = cpu_rq(push_cpu);
                double_lock_balance(busiest, rq);
                move_tasks(rq, push_cpu, busiest, 1, sd, IDLE);

in the for_each_cpu_mask() loop we specifically check for each CPU in
the target group to be idle - so push_cpu's runqueue == busiest [==
current runqueue] cannot be true because the current CPU is not idle, we
are running in the migration thread ... But this is not a real problem,
load-balancing we do in a racy way to reduce overhead [and it's all
statistics anyway so absolute accuracy is impossible], and active
balancing itself is somewhat racy due to the migration-thread wakeup
(and the active_balance flag) going outside the runqueue locks [for
similar reasons].

so it all looks quite plausible - the normal SMP boxes dont trigger it,
but Bjorn's 128-CPU setup with a non-trivial domain hiearachy triggers
it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

active_load_balance() looks susceptible to deadlock when busiest==rq.
Without the following patch, my 128-way box deadlocks consistently
during boot-time driver init.

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

Add w83627hf_select_wd_register and w83627hf_unselect_wd_register.
Add w83627hf_init to fix initialization problem on certain motherboards.
Make ping and disable code return 0 (int) on success.
Extract set_heartbeat code to seperate function.

We already have over 200 sign-off lines in the kernel, so
let's document the thing, even if discussion may still be
on-going.

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

into delerium.codemonkey.org.uk:/mnt/nfs/neologic/bar/src/kernel/2.6/trees/agpgart

From: Matt Domsch.
The E7205 doesn't have an AGP header, so printing this message is
pretty much useless.  Also make it KERN_WARNING as well, as it's
not really worthy of a KERN_ERR
 

(the bios might not have done that).

From: Arjan van de Ven

This option only worked for the amd64 driver.
On every other driver, the only thing it did was
make it not printk the banner on startup.

This is horribly broken due to a jiffy wrap bug, we never get out of
the while loop, preventing booting on a kernel with this driver
compiled in. (See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124495)

The warning message there has never been reported in any bug report
that google can find, so I'm of the opinion that this driver is trying
to be too clever for its own good.  Rip out the jiffies logic completely,
it should be totally unnecessary.

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

Arjan noted that in some cases, the build fails.
This should fix it up.

From: <fxkuehl@gmx.de>

When I switch the computer to standby with echo -n standby >
/sys/power/state the radeonfb driver tells me its suspending to state 1 but
the display does not get turned off.  It turns out to be a small typo in
drivers/video/aty/radeon_pm.c.

(from http://bugme.osdl.org/show_bug.cgi?id=2758)
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: "Mikael Starvik" <mikael.starvik@axis.com>

- Lots of fixes from 2.4.

- Updated for 2.6.6.

- Added IDE driver
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: William Lee Irwin III <wli@holomorphy.com>

Split off from suparna's patches:

Correct use_mm()/unuse_mm() to use task_lock() to protect task->mm.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: William Lee Irwin III <wli@holomorphy.com>

Minor aio correction split off from suparna's patches:

Use the dedicated aio workqueue, not keventd, in order to isolate the rest
of the system from aio's demands.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: George France <france@handhelds.org>

Teach cpqarray.c to do the add_disk_randomness() thing.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Ingo Molnar <mingo@elte.hu>

Now the x86_64 bitop memory clobber problem has been fixed we can remove
this.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Andi Kleen <ak@muc.de>

Add missing memory clobbers to find_first_bit() and find_first_zero_bit().
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: NeilBrown <neilb@cse.unsw.edu.au>

The read-ahead structures were not being initialised properly, and were not
having the use-count decremented after use, making them fairly useless
(since Apr 2002!).

From: Colin Gibbs <colin@gibbsonline.net>
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>

From: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Christoph Hellwig <hch@lst.de>

timer.h is using NULL and thus needs stddef.h, without it some drivers
break on alpha.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: bert hubert <ahu@ds9a.nl>

Documentation is in fact for tgkill and not for tkill
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Marc-Christian Petersen <m.c.p@kernel.linux-systeme.com>

Give the vesafb `vram' boot option the same (silly) syntax as 2.4 and
document it.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Diego Calleja =?ISO-8859-15?Q?Garc=EDa?= <diegocg@teleline.es>

It'll be much better if the world can know about the existence of
checkstacks.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Christoph Hellwig <hch@lst.de>

Extracted from the Debian kernel package
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Adrian Bunk <bunk@fs.tum.de>

  LD      .tmp_vmlinux1
security/built-in.o(.text+0x97e4): In function `selnl_notify':
: undefined reference to `alloc_skb'
security/built-in.o(.text+0x988a): In function `selnl_notify':
: undefined reference to `netlink_broadcast'
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Adrian Bunk <bunk@fs.tum.de>

POSIX_MQUEUE requires netlink.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: Ingo Molnar <mingo@elte.hu>

the patch below gets rid of a message that gets printed during FC2's quiet
bootup.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

From: <gniibe@m17n.org>

There is a missing pop-off after call of acpi_enter_sleep_state.  On
success, acpi_enter_sleep_state never returns, but on failure, it will
cause kernel OOPS.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>