ata: Do not disable interrupts in ide code for preempt-rt

Use the local_irq_*_nort variants.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
ide: Do not disable interrupts for PREEMPT-RT

Use the local_irq_*_nort variants.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
infiniband: Mellanox IB driver patch use _nort() primitives

Fixes in_atomic stack-dump, when Mellanox module is loaded into the RT
Kernel.

Michael S. Tsirkin <mst@dev.mellanox.co.il> sayeth:
"Basically, if you just make spin_lock_irqsave (and spin_lock_irq) not disable
interrupts for non-raw spinlocks, I think all of infiniband will be fine without
changes."

Signed-off-by: Sven-Thorsten Dietrich <sven@thebigcorporation.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
input: gameport: Do not disable interrupts on PREEMPT_RT

Use the _nort() primitives.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
acpi: Do not disable interrupts on PREEMPT_RT

Use the local_irq_*_nort() variants.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
core: Do not disable interrupts on RT in kernel/users.c

Use the local_irq_*_nort variants to reduce latencies in RT. The code
is serialized by the locks. No need to disable interrupts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
core: Do not disable interrupts on RT in res_counter.c

Frederic Weisbecker reported this warning:

[   45.228562] BUG: sleeping function called from invalid context at kernel/rtmutex.c:683
[   45.228571] in_atomic(): 0, irqs_disabled(): 1, pid: 4290, name: ntpdate
[   45.228576] INFO: lockdep is turned off.
[   45.228580] irq event stamp: 0
[   45.228583] hardirqs last  enabled at (0): [<(null)>] (null)
[   45.228589] hardirqs last disabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
[   45.228602] softirqs last  enabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
[   45.228609] softirqs last disabled at (0): [<(null)>] (null)
[   45.228617] Pid: 4290, comm: ntpdate Tainted: G        W  2.6.29-rc4-rt1-tip #1
[   45.228622] Call Trace:
[   45.228632]  [<ffffffff8027dfb0>] ? print_irqtrace_events+0xd0/0xe0
[   45.228639]  [<ffffffff8024cd73>] __might_sleep+0x113/0x130
[   45.228646]  [<ffffffff8077c811>] rt_spin_lock+0xa1/0xb0
[   45.228653]  [<ffffffff80296a3d>] res_counter_charge+0x5d/0x130
[   45.228660]  [<ffffffff802fb67f>] __mem_cgroup_try_charge+0x7f/0x180
[   45.228667]  [<ffffffff802fc407>] mem_cgroup_charge_common+0x57/0x90
[   45.228674]  [<ffffffff80212096>] ? ftrace_call+0x5/0x2b
[   45.228680]  [<ffffffff802fc49d>] mem_cgroup_newpage_charge+0x5d/0x60
[   45.228688]  [<ffffffff802d94ce>] __do_fault+0x29e/0x4c0
[   45.228694]  [<ffffffff8077c843>] ? rt_spin_unlock+0x23/0x80
[   45.228700]  [<ffffffff802db8b5>] handle_mm_fault+0x205/0x890
[   45.228707]  [<ffffffff80212096>] ? ftrace_call+0x5/0x2b
[   45.228714]  [<ffffffff8023495e>] do_page_fault+0x11e/0x2a0
[   45.228720]  [<ffffffff8077e5a5>] page_fault+0x25/0x30
[   45.228727]  [<ffffffff8043e1ed>] ? __clear_user+0x3d/0x70
[   45.228733]  [<ffffffff8043e1d1>] ? __clear_user+0x21/0x70

The reason is the raw IRQ flag use of kernel/res_counter.c.

The irq flags tricks there seem a bit pointless: it cannot protect the
c->parent linkage because local_irq_save() is only per CPU.

So replace it with _nort(). This code needs a second look.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
usb: Use local_irq_*_nort() variants

[ tglx: Now that irqf_disabled is dead we should kill that ]

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
tty: Do not disable interrupts in put_ldisc on -rt

Fixes the following on PREEMPT_RT:

BUG: sleeping function called from invalid context at kernel/rtmutex.c:684
in_atomic(): 0, irqs_disabled(): 1, pid: 9116, name: sshd
Pid: 9116, comm: sshd Not tainted 2.6.31-rc6-rt2 #6
Call Trace:
[<ffffffff81034a4f>] __might_sleep+0xec/0xee
[<ffffffff812fbc6d>] rt_spin_lock+0x34/0x75
[ffffffff81064a83>] atomic_dec_and_spin_lock+0x36/0x54
[<ffffffff811df7c7>] put_ldisc+0x57/0xa6
[<ffffffff811dfb87>] tty_ldisc_hangup+0xe7/0x19f
[<ffffffff811d9224>] do_tty_hangup+0xff/0x319
[<ffffffff811d9453>] tty_vhangup+0x15/0x17
[<ffffffff811e1263>] pty_close+0x127/0x12b
[<ffffffff811dac41>] tty_release_dev+0x1ad/0x4c0
....

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
mm: scatterlist dont disable irqs on RT

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
signal-fix-up-rcu-wreckage.patch

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
net-wireless-warn-nort.patch

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
mm: Replace cgroup_page bit spinlock

Bit spinlocks are not working on RT. Replace them.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
buffer_head: Replace bh_uptodate_lock for -rt

Wrap the bit_spin_lock calls into a separate inline and add the RT
replacements with a real spinlock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>