clocksource: Exynos_mct: Use irq_force_affinity() in cpu bringup

commit 30ccf03b4a6a2102a2219058bdc6d779dc637dd7 upstream.

The starting cpu is not yet in the online mask so irq_set_affinity()
fails which results in per cpu timers for this cpu ending up on some
other online cpu, ususally cpu 0.

Use irq_force_affinity() which disables the online mask check and
makes things work.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Tomasz Figa <t.figa@samsung.com>,
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: linux-arm-kernel@lists.infradead.org,
Link: http://lkml.kernel.org/r/20140416143316.106665251@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 48f76bc..0c64fad 100644 (file)
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -432,6 +432,7 @@ static int exynos4_local_timer_setup(struct clock_event_device *evt)
                                evt->irq);
                        return -EIO;
                }
+               irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu));
        } else {
                enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
        }
@@ -452,7 +453,6 @@ static int exynos4_mct_cpu_notify(struct notifier_block *self,
                                           unsigned long action, void *hcpu)
 {
        struct mct_clock_event_device *mevt;
-       unsigned int cpu;
 
        /*
         * Grab cpu pointer in each case to avoid spurious
@@ -463,12 +463,6 @@ static int exynos4_mct_cpu_notify(struct notifier_block *self,
                mevt = this_cpu_ptr(&percpu_mct_tick);
                exynos4_local_timer_setup(&mevt->evt);
                break;
-       case CPU_ONLINE:
-               cpu = (unsigned long)hcpu;
-               if (mct_int_type == MCT_INT_SPI)
-                       irq_set_affinity(mct_irqs[MCT_L0_IRQ + cpu],
-                                               cpumask_of(cpu));
-               break;
        case CPU_DYING:
                mevt = this_cpu_ptr(&percpu_mct_tick);
                exynos4_local_timer_stop(&mevt->evt);