linux.git/arch/sh/kernel/smp.c, branch v3.0

sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()

2011-04-14T06:52:32+00:00

For future rework of try_to_wake_up() we'd like to push part of that
function onto the CPU the task is actually going to run on.

In order to do so we need a generic callback from the existing scheduler IPI.

This patch introduces such a generic callback: scheduler_ipi() and
implements it as a NOP.

BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions!

Acked-by: Russell King 
Acked-by: Martin Schwidefsky 
Acked-by: Chris Metcalf 
Acked-by: Jesper Nilsson 
Acked-by: Benjamin Herrenschmidt 
Signed-off-by: Ralf Baechle 
Reviewed-by: Frank Rowand 
Cc: Mike Galbraith 
Cc: Nick Piggin 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Signed-off-by: Ingo Molnar 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl

sh: native_cpu_disable() build error when CONFIG_HOTPLUG_CPU=n

2010-04-29T14:28:38+00:00

arch/sh/kernel/smp.c:164: error: conflicting types for 'native_cpu_disable'
/home/matt/src/kernels/sh-2.6/arch/sh/include/asm/smp.h:48: error: previous declaration of 'native_cpu_disable' was here

Signed-off-by: Matt Fleming 
Signed-off-by: Paul Mundt

sh: CPU hotplug support.

2010-04-26T10:08:55+00:00

This adds preliminary support for CPU hotplug for SH SMP systems.

Signed-off-by: Paul Mundt

sh: cache secondary CPUs idle loop.

2010-04-26T09:59:47+00:00

This provides a cache of the secondary CPUs idle loop for the cases where
hotplug simply enters a low power state instead of resetting or powering
off the core.

Signed-off-by: Paul Mundt

sh: flag smp_store_cpu_info() __cpuinit.

2010-04-26T09:55:01+00:00

smp_store_cpu_info() is presently flagged as __init, but is called by
start_secondary() which is __cpuinit, fix it up.

Signed-off-by: Paul Mundt

sh: provide percpu CPU states for hotplug notifiers.

2010-04-26T09:49:58+00:00

This provides percpu CPU states in preparation for CPU hotplug and the
associated notifier chains.

Signed-off-by: Paul Mundt

sh: convert online CPU map twiddling to cpumask.

2010-04-26T09:39:50+00:00

This converts from cpu_set() for the online map to set_cpu_online().
The two online map modifiers were the last remaining manual map
manipulation bits, with this in place everything now goes through
cpumask.

Signed-off-by: Paul Mundt

sh: Move platform smp ops in to their own structure.

2010-04-21T03:23:25+00:00

This cribs the MIPS plat_smp_ops approach for wrapping up the platform
ops. This will allow for mixing and matching different ops on the same
platform in the future.

Signed-off-by: Paul Mundt

sh: Enable the mmu in start_secondary()

2010-03-29T03:11:51+00:00

For the boot, enable_mmu() is called from setup_arch() but we don't call
setup_arch() for any of the other cpus. So turn on the non-boot cpu's
mmu inside of start_secondary().

I noticed this bug on an SMP board when trying to map I/O memory
(smsc911x registers) into the kernel address space. Since the Address
Translation bit in MMUCR wasn't set, accessing the virtual address where
the smsc911x registers were supposedly mapped actually performed a
physical address access.

Signed-off-by: Matt Fleming 
Cc: stable@kernel.org
Signed-off-by: Paul Mundt

sh: machine_ops based reboot support.

2010-01-20T07:42:52+00:00

This provides a machine_ops-based reboot interface loosely cloned from
x86, and converts the native sh32 and sh64 cases over to it.

Necessary both for tying in SMP support and also enabling platforms like
SDK7786 to add support for their microcontroller-based power managers.

Signed-off-by: Paul Mundt