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rcu: Remove rcu_is_idle_cpu() 

ANBZ: #8995

commit fdbdb86845 upstream

The commit 3fcd6a230f ("x86/cpu: Avoid cpuinfo-induced IPIing of
idle CPUs") introduced rcu_is_idle_cpu() in order to identify the
current CPU idle state.  But commit f3eca381bd ("x86/aperfmperf:
Replace arch_freq_get_on_cpu()") switched to using MAX_SAMPLE_AGE,
so rcu_is_idle_cpu() is no longer used.  This commit therefore removes it.

Fixes: f3eca381bd ("x86/aperfmperf: Replace arch_freq_get_on_cpu()")
Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Guanjun <guanjun@linux.alibaba.com>
Reviewed-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3161
This commit is contained in:
Yipeng Zou 2022-09-26 09:58:27 +08:00 committed by 小龙
parent 9831c77407
commit 3e9b2ab5b3
3 changed files with 0 additions and 11 deletions
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2
include/linux/rcutiny.h
View File

@ -89,8 +89,6 @@ static inline void rcu_irq_enter_irqson(void) { }
static inline void rcu_irq_exit(void) { }
static inline void rcu_irq_exit_preempt(void) { }
static inline void rcu_irq_exit_check_preempt(void) { }
#define rcu_is_idle_cpu(cpu) \
(is_idle_task(current) && !in_nmi() && !in_irq() && !in_serving_softirq())
static inline void exit_rcu(void) { }
static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
{

1
include/linux/rcutree.h
View File

@ -50,7 +50,6 @@ void rcu_irq_exit(void);
void rcu_irq_exit_preempt(void);
void rcu_irq_enter_irqson(void);
void rcu_irq_exit_irqson(void);
bool rcu_is_idle_cpu(int cpu);
#ifdef CONFIG_PROVE_RCU
void rcu_irq_exit_check_preempt(void);

8
kernel/rcu/tree.c
View File

@ -341,14 +341,6 @@ static bool rcu_dynticks_in_eqs(int snap)
return !(snap & RCU_DYNTICK_CTRL_CTR);
}
/* Return true if the specified CPU is currently idle from an RCU viewpoint. */
bool rcu_is_idle_cpu(int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
return rcu_dynticks_in_eqs(rcu_dynticks_snap(rdp));
}
/*
* Return true if the CPU corresponding to the specified rcu_data
* structure has spent some time in an extended quiescent state since