linux-toradex.git/arch/sh/kernel/idle.c, branch v2.6.38.2

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: 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: Tidy up a couple of section mismatches.

2010-03-23T08:06:47+00:00

select_idle_routine() and register_sh_pmu() both needed their annotations
fixed up to silence section mismatch warnings.

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

sh: Only use bl bit toggling for sleeping idle.

2009-12-21T02:57:33+00:00

We don't actually require this in the cpu_relax() polling case, so just
cuddle these around the sleeping version.

Signed-off-by: Paul Mundt

sh: Restore bl bit toggling in idle loop.

2009-12-21T02:57:29+00:00

This fixes up some crashes with IRQs racing the need_resched() test under
QEMU.

Signed-off-by: Paul Mundt

sh: Fix up IRQ re-enabling for the need_resched() case.

2009-10-16T08:55:59+00:00

In the case where need_resched() is set in between the cpu_idle() and
pm_idle() calls we were missing an else case for just re-enabling local
IRQs and bailing out. This was noticed by the irqs_disabled() warning,
even though IRQs were being re-enabled elsewhere.

Signed-off-by: Paul Mundt

sh: Make check_pgt_cache() more aggressive while idling.

2009-10-16T08:27:58+00:00

This follows the x86 change and moves check_pgt_cache() up under the
!need_resched() tight loop, rather than simply calling in to it when
exiting idle.

Signed-off-by: Paul Mundt

sh: Idle loop chainsawing for SMP-based light sleep.

2009-10-16T08:20:58+00:00

This does a bit of chainsawing of the idle loop code to get light sleep
working on SMP. Previously this was forcing secondary CPUs in to sleep
mode with them not coming back if they didn't have their own local
timers. Given that we use clockevents broadcasting by default, the CPU
managing the clockevents can't have IRQs disabled before entering its
sleep state.

This unfortunately leaves us with the age-old need_resched() race in
between local_irq_enable() and cpu_sleep(), but at present this is
unavoidable. After some more experimentation it may be possible to layer
on SR.BL bit manipulation over top of this scheme to inhibit the race
condition, but given the current potential for missing wakeups, this is
left as a future exercise.

Signed-off-by: Paul Mundt

sh: Provide cpu_idle_wait() to fix up cpuidle/SMP build.

2009-06-23T08:30:17+00:00

Crib the x86 cpu_idle_wait() implementation and shove it in with the
idle code, subsequently enabling ARCH_HAS_CPU_IDLE_WAIT.

Signed-off-by: Paul Mundt