x86: C1E late detection fix. Really switch off lapic timer

Doh, I completely missed that devices marked DUMMY are not running
the set_mode function. So we force broadcasting, but we keep the
local APIC timer running.

Let the clock event layer mark the device _after_ switching it off.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 09b8209..2250c65 100644 (file)
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -974,15 +974,12 @@ void __init setup_boot_APIC_clock (void)
  */
 void __cpuinit check_boot_apic_timer_broadcast(void)
 {
-       struct clock_event_device *levt = &per_cpu(lapic_events, boot_cpu_id);
-
        if (!disable_apic_timer ||
            (lapic_clockevent.features & CLOCK_EVT_FEAT_DUMMY))
                return;
 
        printk(KERN_INFO "AMD C1E detected late. Force timer broadcast.\n");
        lapic_clockevent.features |= CLOCK_EVT_FEAT_DUMMY;
-       levt->features |= CLOCK_EVT_FEAT_DUMMY;
 
        local_irq_enable();
        clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE, &boot_cpu_id);

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index fab9dd8..8cfb8b2 100644 (file)
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -222,20 +222,8 @@ static void tick_do_broadcast_on_off(void *why)
        if (!dev || !(dev->features & CLOCK_EVT_FEAT_C3STOP))
                goto out;
 
-       /*
-        * Defect device ?
-        */
-       if (!tick_device_is_functional(dev)) {
-               /*
-                * AMD C1E wreckage fixup:
-                *
-                * Device was registered functional in the first
-                * place. Now the secondary CPU detected the C1E
-                * misfeature and notifies us to fix it up
-                */
-               if (*reason != CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
-                       goto out;
-       }
+       if (!tick_device_is_functional(dev))
+               goto out;
 
        switch (*reason) {
        case CLOCK_EVT_NOTIFY_BROADCAST_ON:
@@ -246,6 +234,8 @@ static void tick_do_broadcast_on_off(void *why)
                                clockevents_set_mode(dev,
                                                     CLOCK_EVT_MODE_SHUTDOWN);
                }
+               if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
+                       dev->features |= CLOCK_EVT_FEAT_DUMMY;
                break;
        case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
                if (cpu_isset(cpu, tick_broadcast_mask)) {