x86, mrst: Set correct APB timer IRQ affinity for secondary cpu

This is a backport for 2.6.37 stable. The original commit ID is
6550904ddbc3c286798a87edf95eeebcc62bc58a

Offlining the secondary CPU causes the timer irq affinity to be set to
CPU 0. When the secondary CPU is back online again, the wrong irq
affinity will be used.

This patch ensures secondary per CPU timer always has the correct
IRQ affinity when enabled.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1294963604-18111-1-git-send-email-jacob.jun.pan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
index 92543c7..5181673 100644 (file)
--- a/arch/x86/kernel/apb_timer.c
+++ b/arch/x86/kernel/apb_timer.c
@@ -313,10 +313,12 @@ static void apbt_setup_irq(struct apbt_dev *adev)
        if (adev->irq == 0)
                return;
 
+       irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
+       irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
+       /* APB timer irqs are set up as mp_irqs, timer is edge type */
+       __set_irq_handler(adev->irq, handle_edge_irq, 0, "edge");
+
        if (system_state == SYSTEM_BOOTING) {
-               irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
-               /* APB timer irqs are set up as mp_irqs, timer is edge type */
-               __set_irq_handler(adev->irq, handle_edge_irq, 0, "edge");
                if (request_irq(adev->irq, apbt_interrupt_handler,
                                IRQF_TIMER | IRQF_DISABLED | IRQF_NOBALANCING,
                                adev->name, adev)) {