[RFC 1/8] ARM: localtimer: return percpu clkevt on register

[Afzal Mohammed]

Return percpu clock event on local timer register. It is the boot cpu
that calls this and it can use the returned percpu clock event to
register a clock event in the case of SMP configuration with one core.
This helps to have a booting Kernel even if no other timer is
registered for clock tick.

Signed-off-by: Afzal Mohammed <af...@ti.com>
---
 arch/arm/include/asm/localtimer.h | 7 ++++---
 arch/arm/kernel/smp.c             | 8 ++++----
 arch/arm/kernel/smp_twd.c         | 5 +++--
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm/include/asm/localtimer.h 
b/arch/arm/include/asm/localtimer.h
index f77ffc1..c3f89c0 100644
--- a/arch/arm/include/asm/localtimer.h
+++ b/arch/arm/include/asm/localtimer.h
@@ -23,11 +23,12 @@ struct local_timer_ops {
 /*
  * Register a local timer driver
  */
-int local_timer_register(struct local_timer_ops *);
+struct clock_event_device *local_timer_register(struct local_timer_ops *);
 #else
-static inline int local_timer_register(struct local_timer_ops *ops)
+static inline
+struct clock_event_device *local_timer_register(struct local_timer_ops *ops)
 {
-       return -ENXIO;
+       return ERR_PTR(-ENXIO);
 }
 #endif
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 5f73f70..42d95d6 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -491,16 +491,16 @@ static void __cpuinit broadcast_timer_setup(struct 
clock_event_device *evt)
 static struct local_timer_ops *lt_ops;
 
 #ifdef CONFIG_LOCAL_TIMERS
-int local_timer_register(struct local_timer_ops *ops)
+struct clock_event_device *local_timer_register(struct local_timer_ops *ops)
 {
        if (!is_smp() || !setup_max_cpus)
-               return -ENXIO;
+               return ERR_PTR(-ENXIO);
 
        if (lt_ops)
-               return -EBUSY;
+               return ERR_PTR(-EBUSY);
 
        lt_ops = ops;
-       return 0;
+       return &per_cpu(percpu_clockevent, smp_processor_id());
 }
 #endif
 
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index c092115..616268c 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -315,6 +315,7 @@ static struct local_timer_ops twd_lt_ops __cpuinitdata = {
 static int __init twd_local_timer_common_register(struct device_node *np)
 {
        int err;
+       struct clock_event_device *evt;
 
        twd_evt = alloc_percpu(struct clock_event_device *);
        if (!twd_evt) {
@@ -328,8 +329,8 @@ static int __init twd_local_timer_common_register(struct 
device_node *np)
                goto out_free;
        }
 
-       err = local_timer_register(&twd_lt_ops);
-       if (err)
+       evt = local_timer_register(&twd_lt_ops);
+       if (IS_ERR(evt))
                goto out_irq;
 
        twd_get_clock(np);
-- 
1.7.12

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/