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x86, acpi, idle: Restructure the mwait idle routines

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People seem to delight in writing wrong and broken mwait idle routines;
collapse the lot.

This leaves mwait_play_dead() the sole remaining user of __mwait() and
new __mwait() users are probably doing it wrong.

Also remove __sti_mwait() as its unused.

Cc: Arjan van de Ven <[email protected]>
Cc: Jacob Jun Pan <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Rui Zhang <[email protected]>
Acked-by: Rafael Wysocki <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Peter Zijlstra 2013-12-12 15:08:36 +01:00 • committed by H. Peter Anvin
commit 1682425539
7 changed files with 43 additions and 78 deletions
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11
drivers/idle/intel_idle.c
View file

@ -375,16 +375,7 @@ static int intel_idle(struct cpuidle_device *dev,
if (!(lapic_timer_reliable_states & (1 << (cstate))))
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);
if (!current_set_polling_and_test()) {
if (this_cpu_has(X86_FEATURE_CLFLUSH_MONITOR))
clflush((void *)&current_thread_info()->flags);
__monitor((void *)&current_thread_info()->flags, 0, 0);
smp_mb();
if (!need_resched())
__mwait(eax, ecx);
}
mwait_idle_with_hints(eax, ecx);
if (!(lapic_timer_reliable_states & (1 << (cstate))))
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu);