[PATCH 3/3] time: drop local_irq_save/restore from irqtime_account_irq

[riel]

From: Rik van Riel <r...@redhat.com>

Paolo pointed out that irqs are already blocked when irqtime_account_irq
is called. That means there is no reason to call local_irq_save/restore
again.

Signed-off-by: Rik van Riel <r...@redhat.com>
Suggested-by: Paolo Bonzini <pbonz...@redhat.com>
---
 kernel/sched/cputime.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index ca7e33cb0967..7b6fa4d7ad4c 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -49,15 +49,12 @@ DEFINE_PER_CPU(seqcount_t, irq_time_seq);
  */
 void irqtime_account_irq(struct task_struct *curr)
 {
-       unsigned long flags;
        s64 delta;
        int cpu;
 
        if (!sched_clock_irqtime)
                return;
 
-       local_irq_save(flags);
-
        cpu = smp_processor_id();
        delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
        __this_cpu_add(irq_start_time, delta);
@@ -75,7 +72,6 @@ void irqtime_account_irq(struct task_struct *curr)
                __this_cpu_add(cpu_softirq_time, delta);
 
        irq_time_write_end();
-       local_irq_restore(flags);
 }
 EXPORT_SYMBOL_GPL(irqtime_account_irq);
 
-- 
2.7.4