Add ARM CPU topology

** This is a combination of 12 commits.
** The first commit's message is:
Add ARM cpu topology definition

(Patch accepted by Russell for 3.1:
http://www.spinics.net/lists/arm-kernel/msg131273.html)

The affinity between ARM processors is defined in the MPIDR register.
We can identify which processors are in the same cluster,
and which ones have performance interdependency. We can define the
cpu topology of ARM platform, that is then used by sched_mc and sched_smt.

The default state of sched_mc and sched_smt config is disable.
When enabled, the behavior of the scheduler can be modified with
sched_mc_power_savings and sched_smt_power_savings sysfs interfaces.

Changes since v4 :
*  Remove unnecessary parentheses and blank lines

Changes since v3 :
* Update the format of printk message
* Remove blank line

Changes since v2 :
* Update the commit message and some comments

Changes since v1 :
* Update the commit message
* Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h
* Modify header of arch/arm/kernel/topology.c
* Modify tests and manipulation of MPIDR's bitfields
* Modify the place and dependancy of the config
* Modify Noop functions

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>

** This is the 2nd commit message:

ARM: cpu topology: fix warning

kernel/sched.c:7354:2: warning: initialization from incompatible pointer type

Align cpu_coregroup_mask prototype interface with sched_domain_mask_f typedef
use int cpu instead of unsigned int cpu

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 3rd commit message:

ARM: cpu topology: Add update_cpu_topology function

arch_update_cpu_topology function is called by the scheduler
before building its sched_domain hierarchy. Prepare the update
of the cpu topology masks in this function in addition to set
it in the the store_cpu_topology which is executed only once per cpu.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 4th commit message:

ARM: cpu topology: modify cpu topology

Modify the CPU topology policy according to the sched_mc level and the cortex family

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 5th commit message:

ARM: scheduler: add a cpu_power function

Add an architecture specific function for setting cpu_power

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 6th commit message:

ARM: cpu topology: Modify cpu_power according to sched_mc level

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 7th commit message:

ARM: cpu topology: Modify cpu_power according to cpufreq

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 8th commit message:

ARM: cpu topology: Add asym topology flag for using cpu0 1st

Modify the CPU sched_domain flags in powersave mode for using the cpu0 in ched_mc powersave mode

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 9th commit message:

ARM: cpu topology: Add debugfs interface for cpu_power

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

** This is the 10th commit message:

sched: Ensure cpu_power periodic update

With a lot of small tasks, the softirq sched is nearly never called
when no_hz is enable. The load_balance is mainly called with
the newly_idle mode which doesn't update the cpu_power.
Add a next_update field which ensures a maximum update period when
there is short activity

Signed-off-by: Vincent Guittot <vincent.guittot at linaro.org>

** This is the 11th commit message:

ARM: scheduler: add a missing part
This fix adds a missing part in the [RFC 07/11].

Signed-off-by: Vincent Guittot <vincent.guittot at linaro.org>

** This is the 12th commit message:

sched: nohz_idle_balance

clear rq->nohz_balance_kick before returning

if idle equals CPU_IDLE, we return and could let nohz_balance_kick set
rq->nohz_balance_kick is tested in nohz_balancer_kick before triggering a SOFTIRQ on the ilb.
If this_rq->nohz_balance_kick stay to 1, the ilb will no be triggered until it wakes up and performs a normal load_balance which will clear the nohz_balance_kick

Signed-off-by: Vincent Guittot <vincent.guittot at linaro.org>
Enable ARM CPU topology
Fix building with Linaro GCC toolchain
ARM: 7583/1: decompressor: Enable unaligned memory access for v6 and above

Modern GCC can generate code which makes use of the CPU's native
unaligned memory access capabilities.  This is useful for the C
decompressor implementations used for unpacking compressed kernels.

This patch disables alignment faults and enables the v6 unaligned
access model on CPUs which support these features (i.e., v6 and
later), allowing full unaligned access support for C code in the
decompressor.

The decompressor C code must not be built to assume that unaligned
access works if support for v5 or older platforms is included in
the kernel.

For correct code generation, C decompressor code must always use
the get_unaligned and put_unaligned accessors when dealing with
unaligned pointers, regardless of this patch.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: allow cpu-supported unaligned access
Sources:
https://github.com/Huexxx/lge-kernel-sniper/commit/8171fdcd687976ec68acbf229c0e5971c23523f4
https://bitbucket.org/EaglesBlood_Development/egb_tuna_kernel/src/1b739f424f00/arch/arm/include/asm/rwsem.h?at=master
Enable unaligned memory access settings