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Subject[PATCH 15/18] 2.6.40: x86 idle: remove deprecated hlt_use_halt()
Date
From: Len Brown <len.brown@intel.com>

Removing the floppy workaround made hlt_use_halt() constant.
So we can now remove it, and we no longer need to test it
in default_idle().

no functional change.

cc: x86@kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
---
arch/x86/kernel/process.c | 39 ++++++++++++++-------------------------
1 files changed, 14 insertions(+), 25 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 09bd118..53fb569 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -344,39 +344,28 @@ void (*pm_idle)(void);
EXPORT_SYMBOL(pm_idle);
#endif

-static inline int hlt_use_halt(void)
-{
- return 1;
-}
-
/*
* We use this if we don't have any better
* idle routine..
*/
void default_idle(void)
{
- if (hlt_use_halt()) {
- trace_power_start(POWER_CSTATE, 1, smp_processor_id());
- trace_cpu_idle(1, smp_processor_id());
- current_thread_info()->status &= ~TS_POLLING;
- /*
- * TS_POLLING-cleared state must be visible before we
- * test NEED_RESCHED:
- */
- smp_mb();
+ trace_power_start(POWER_CSTATE, 1, smp_processor_id());
+ trace_cpu_idle(1, smp_processor_id());
+ current_thread_info()->status &= ~TS_POLLING;
+ /*
+ * TS_POLLING-cleared state must be visible before we
+ * test NEED_RESCHED:
+ */
+ smp_mb();

- if (!need_resched())
- safe_halt(); /* enables interrupts racelessly */
- else
- local_irq_enable();
- current_thread_info()->status |= TS_POLLING;
- trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
- } else {
+ if (!need_resched())
+ safe_halt(); /* enables interrupts racelessly */
+ else
local_irq_enable();
- /* loop is done by the caller */
- cpu_relax();
- }
+ current_thread_info()->status |= TS_POLLING;
+ trace_power_end(smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
}
#if defined(CONFIG_APM_MODULE) && defined(CONFIG_APM_CPU_IDLE)
EXPORT_SYMBOL(default_idle);
--
1.7.5.rc0


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