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rcu: Remove rcu_is_idle_cpu()
The commit3fcd6a230f
("x86/cpu: Avoid cpuinfo-induced IPIing of idle CPUs") introduced rcu_is_idle_cpu() in order to identify the current CPU idle state. But commitf3eca381bd
("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>
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@ -146,8 +146,6 @@ static inline void rcu_virt_note_context_switch(void) { }
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static inline void rcu_cpu_stall_reset(void) { }
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static inline void rcu_cpu_stall_reset(void) { }
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static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
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static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
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static inline void rcu_irq_exit_check_preempt(void) { }
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static inline void rcu_irq_exit_check_preempt(void) { }
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#define rcu_is_idle_cpu(cpu) \
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(is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq())
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static inline void exit_rcu(void) { }
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static inline void exit_rcu(void) { }
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static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
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static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
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{
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{
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@ -87,8 +87,6 @@ bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
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void cond_synchronize_rcu(unsigned long oldstate);
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void cond_synchronize_rcu(unsigned long oldstate);
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void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
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void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
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bool rcu_is_idle_cpu(int cpu);
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#ifdef CONFIG_PROVE_RCU
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#ifdef CONFIG_PROVE_RCU
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void rcu_irq_exit_check_preempt(void);
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void rcu_irq_exit_check_preempt(void);
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#else
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#else
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@ -301,12 +301,6 @@ static bool rcu_dynticks_in_eqs(int snap)
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return !(snap & RCU_DYNTICKS_IDX);
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return !(snap & RCU_DYNTICKS_IDX);
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}
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}
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/* Return true if the specified CPU is currently idle from an RCU viewpoint. */
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bool rcu_is_idle_cpu(int cpu)
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{
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return rcu_dynticks_in_eqs(rcu_dynticks_snap(cpu));
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}
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/*
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/*
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* Return true if the CPU corresponding to the specified rcu_data
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* Return true if the CPU corresponding to the specified rcu_data
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* structure has spent some time in an extended quiescent state since
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* structure has spent some time in an extended quiescent state since
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