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ARM: fix rcu stalls on SMP platforms

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commit 7deabca0ac upstream.

We can stall RCU processing on SMP platforms if a CPU sits in its idle
loop for a long time.  This happens because we don't call irq_enter()
and irq_exit() around generic_smp_call_function_interrupt() and
friends.  Add the necessary calls, and remove the one from within
ipi_timer(), so that they're all in a common place.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[add irq_enter()/irq_exit() in do_local_timer]
Signed-off-by: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King
2012-01-19 15:20:58 +00:00
committed by Greg Kroah-Hartman
parent a6218ee909
commit d1877392b4
1 changed files with 10 additions and 2 deletions
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12
arch/arm/kernel/smp.c
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@@ -445,9 +445,7 @@ static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
static void ipi_timer(void)
{
struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);
irq_enter();
evt->event_handler(evt);
irq_exit();
}
#ifdef CONFIG_LOCAL_TIMERS
@@ -458,7 +456,9 @@ asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs)
if (local_timer_ack()) {
__inc_irq_stat(cpu, local_timer_irqs);
irq_enter();
ipi_timer();
irq_exit();
}
set_irq_regs(old_regs);
@@ -568,7 +568,9 @@ asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
switch (ipinr) {
case IPI_TIMER:
irq_enter();
ipi_timer();
irq_exit();
break;
case IPI_RESCHEDULE:
@@ -576,15 +578,21 @@ asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
break;
case IPI_CALL_FUNC:
irq_enter();
generic_smp_call_function_interrupt();
irq_exit();
break;
case IPI_CALL_FUNC_SINGLE:
irq_enter();
generic_smp_call_function_single_interrupt();
irq_exit();
break;
case IPI_CPU_STOP:
irq_enter();
ipi_cpu_stop(cpu);
irq_exit();
break;
default: