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Merge tag 'remove-local-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm into next/cleanup

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From Stephen Boyd:

Now that we have a generic arch hook for broadcast we can remove the
local timer API entirely. Doing so will reduce code in ARM core, reduce
the architecture dependencies of our timer drivers, and simplify the code
because we no longer go through an architecture layer that is essentially
a hotplug notifier.

* tag 'remove-local-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: smp: Remove local timer API
  clocksource: time-armada-370-xp: Divorce from local timer API
  clocksource: time-armada-370-xp: Fix sparse warning
  ARM: msm: Divorce msm_timer from local timer API
  ARM: PRIMA2: Divorce timer-marco from local timer API
  ARM: EXYNOS4: Divorce mct from local timer API
  ARM: OMAP2+: Divorce from local timer API
  ARM: smp_twd: Divorce smp_twd from local timer API
  ARM: smp: Remove duplicate dummy timer implementation

Resolved a large number of conflicts due to __cpuinit cleanups, etc.

Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson
2013-07-23 14:51:34 -07:00
parent 3b2f64d00c 060fd3043e
commit 47dcd3563e
19 changed files with 265 additions and 341 deletions
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87
arch/arm/kernel/smp.c
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@@ -41,7 +41,6 @@
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
#include <asm/localtimer.h>
#include <asm/smp_plat.h>
#include <asm/virt.h>
#include <asm/mach/arch.h>
@@ -146,8 +145,6 @@ int boot_secondary(unsigned int cpu, struct task_struct *idle)
}
#ifdef CONFIG_HOTPLUG_CPU
static void percpu_timer_stop(void);
static int platform_cpu_kill(unsigned int cpu)
{
if (smp_ops.cpu_kill)
@@ -190,11 +187,6 @@ int __cpu_disable(void)
*/
migrate_irqs();
/*
* Stop the local timer for this CPU.
*/
percpu_timer_stop();
/*
* Flush user cache and TLB mappings, and then remove this CPU
* from the vm mask set of all processes.
@@ -316,8 +308,6 @@ static void smp_store_cpu_info(unsigned int cpuid)
store_cpu_topology(cpuid);
}
static void percpu_timer_setup(void);
/*
* This is the secondary CPU boot entry. We're using this CPUs
* idle thread stack, but a set of temporary page tables.
@@ -372,11 +362,6 @@ asmlinkage void secondary_start_kernel(void)
set_cpu_online(cpu, true);
complete(&cpu_running);
/*
* Setup the percpu timer for this CPU.
*/
percpu_timer_setup();
local_irq_enable();
local_fiq_enable();
@@ -422,12 +407,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
if (max_cpus > ncores)
max_cpus = ncores;
if (ncores > 1 && max_cpus) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
*/
percpu_timer_setup();
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time. A platform should
@@ -504,11 +483,6 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
return sum;
}
/*
* Timer (local or broadcast) support
*/
static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
void tick_broadcast(const struct cpumask *mask)
{
@@ -516,67 +490,6 @@ void tick_broadcast(const struct cpumask *mask)
}
#endif
static void broadcast_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
}
static void broadcast_timer_setup(struct clock_event_device *evt)
{
evt->name = "dummy_timer";
evt->features = CLOCK_EVT_FEAT_ONESHOT |
CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_DUMMY;
evt->rating = 100;
evt->mult = 1;
evt->set_mode = broadcast_timer_set_mode;
clockevents_register_device(evt);
}
static struct local_timer_ops *lt_ops;
#ifdef CONFIG_LOCAL_TIMERS
int local_timer_register(struct local_timer_ops *ops)
{
if (!is_smp() || !setup_max_cpus)
return -ENXIO;
if (lt_ops)
return -EBUSY;
lt_ops = ops;
return 0;
}
#endif
static void percpu_timer_setup(void)
{
unsigned int cpu = smp_processor_id();
struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
evt->cpumask = cpumask_of(cpu);
if (!lt_ops || lt_ops->setup(evt))
broadcast_timer_setup(evt);
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* The generic clock events code purposely does not stop the local timer
* on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it
* manually here.
*/
static void percpu_timer_stop(void)
{
unsigned int cpu = smp_processor_id();
struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
if (lt_ops)
lt_ops->stop(evt);
}
#endif
static DEFINE_RAW_SPINLOCK(stop_lock);
/*