APM idle: register apm_cpu_idle via cpuidle

Update APM to register its local idle routine with cpuidle.

This allows us to stop exporting pm_idle to modules on x86.

The Kconfig sub-option, APM_CPU_IDLE, now depends on on CPU_IDLE.

Compile-tested only.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Jiri Kosina <jkosina@suse.cz>
x86 idle: rename global pm_idle to static x86_idle

(pm_idle)() is being removed from linux/pm.h
because Linux does not have such a cross-architecture concept.

x86 uses an idle function pointer in its architecture
specific code as a backup to cpuidle.  So we re-name
x86 use of pm_idle to x86_idle, and make it static to x86.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
sh idle: rename global pm_idle to static sh_idle

SH idle code could use some simplification.
This patch enables that by guaranteeing
that "sh_idle" is local, and thus architecture specific.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-sh@vger.kernel.org
sparc idle: rename pm_idle to sparc_idle

(pm_idle)() is being removed from linux/pm.h
because Linux does not have such a cross-architecture concept.

sparc uses an idle function pointer in its architecture
specific code.  So we re-name sparc use of pm_idle to sparc_idle.

Maybe some day, SPARC will cut over to cpuidle...

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: sparclinux@vger.kernel.org
blackfin idle: delete pm_idle

pm_idle is dead code on blackfin.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: uclinux-dist-devel@blackfin.uclinux.org
ARM idle: delete pm_idle

pm_idle() on ARM was a synonym for default_idle(),
so simply invoke default_idle() directly.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
ARM64 idle: delete pm_idle

pm_idle() on arm64 was a synonym for default_idle(),
so remove it and invoke default_idle() directly.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
cris idle: delete idle and pm_idle

pm_idle() and idle() served no purpose on cris --
invoke default_idle() directly.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-cris-kernel@axis.com
ia64 idle: delete pm_idle

pm_idle() on ia64 was a synonym for default_idle().
So simply invoke default_idle() directly.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-ia64@vger.kernel.org
m32r idle: delete pm_idle, and other dead idle code

All paths on m32r lead to cpu_relax().
So delete the dead code and simply call cpu_relax() directly.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-m32r@ml.linux-m32r.org
microblaze idle: delete pm_idle

pm_idle on microblaze served no purpose.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: microblaze-uclinux@itee.uq.edu.au
mn10300 idle: delete pm_idle

pm_idle on mn10300 served no purpose.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-am33-list@redhat.com
openrisc idle: delete pm_idle

pm_idle() on openrisc was dead code.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux@lists.openrisc.net
unicore32 idle: delete stray pm_idle comment

as pm_idle() has already been deleted from this code,
the comment was a stray.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
PM idle: remove global declaration of pm_idle

pm_idle appears in no generic Linux code,
it appears only in architecture-specific code.

Thus, pm_idle should not be declared in pm.h.

Architectures that  use an idle function pointer
should delcare one local to their architecture,
and/or use cpuidle.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: linux-pm@vger.kernel.org
xen idle: make xen-specific macro xen-specific

This macro is only invoked by Xen,
so make its definition specific to Xen.

> set_pm_idle_to_default()
< xen_set_default_idle()

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: xen-devel@lists.xensource.com
x86 idle: remove mwait_idle() and "idle=mwait" cmdline param

mwait_idle() is a C1-only idle loop intended to be more efficient
than HLT, starting on Pentium-4 HT-enabled processors.

But mwait_idle() has been replaced by the more general
mwait_idle_with_hints(), which handles both C1 and deeper C-states.
ACPI processor_idle and intel_idle use only mwait_idle_with_hints(),
and no longer use mwait_idle().

Here we simplify the x86 native idle code by removing mwait_idle(),
and the "idle=mwait" bootparam used to invoke it.

Since Linux 3.0 there has been a boot-time warning when "idle=mwait"
was invoked saying it would be removed in 2012.  This removal
was also noted in the (now removed:-) feature-removal-schedule.txt.

After this change, kernels configured with
(CONFIG_ACPI=n && CONFIG_INTEL_IDLE=n) when run on hardware
that supports MWAIT will simply use HLT.  If MWAIT is desired
on those systems, cpuidle and the cpuidle drivers above
can be enabled.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
x86 idle: remove 32-bit-only "no-hlt" parameter, hlt_works_ok flag

Remove 32-bit x86 a cmdline param "no-hlt",
and the cpuinfo_x86.hlt_works_ok that it sets.

If a user wants to avoid HLT, then "idle=poll"
is much more useful, as it avoids invocation of HLT
in idle, while "no-hlt" failed to do so.

Indeed, hlt_works_ok was consulted in only 2 places.

First, in /proc/cpuinfo where "hlt_bug yes"
would be printed if and only if the user booted
the system with "no-hlt" -- as there was no other code
to set that flag.

Second, it was consulted in stop_this_cpu(), which is invoked
by native_machine_halt()/reboot_interrupt()/smp_stop_nmi_callback() --
all cases where the machine is being shutdown/reset.
The flag was not consulted in the more frequently invoked
play_dead()/hlt_play_dead() used in processor offline and suspend.

Since Linux-3.0 there has been a run-time notice upon "no-hlt" invocations
indicating that it would be removed in 2012.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
Merge branches 'idle-remove-statedata', 'pm_idle' and 'hsw-idle' into release
Merge branch 'idle-misc' into release

Conflicts:
	arch/x86/kernel/process.c