The commit "x86/cpu: Avoid cpuinfo-induced IPIing of idle CPUs" introduce
this function to identify the current CPU idle state.
But after commit "x86/aperfmperf: Replace arch_freq_get_on_cpu()" we
just use MAX_SAMPLE_AGE to do that, So there is no use of this function.
Fixes: f3eca381bd49 ("x86/aperfmperf: Replace arch_freq_get_on_cpu()")
Signed-off-by: Yipeng Zou <zouyipeng@xxxxxxxxxx>
---
include/linux/rcutiny.h | 2 --
include/linux/rcutree.h | 2 --
kernel/rcu/tree.c | 6 ------
3 files changed, 10 deletions(-)
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 9bc025aa79a3..5c271bf3a1e7 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -146,8 +146,6 @@ static inline void rcu_virt_note_context_switch(void) { }
static inline void rcu_cpu_stall_reset(void) { }
static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
static inline void rcu_irq_exit_check_preempt(void) { }
-#define rcu_is_idle_cpu(cpu) \
- (is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq())
static inline void exit_rcu(void) { }
static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
{
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 70795386b9ff..4003bf6cfa1c 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -87,8 +87,6 @@ bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
void cond_synchronize_rcu(unsigned long oldstate);
void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
-bool rcu_is_idle_cpu(int cpu);
-
#ifdef CONFIG_PROVE_RCU
void rcu_irq_exit_check_preempt(void);
#else
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 5ec97e3f7468..f6561aa401c0 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -301,12 +301,6 @@ static bool rcu_dynticks_in_eqs(int snap)
return !(snap & RCU_DYNTICKS_IDX);
}
-/* Return true if the specified CPU is currently idle from an RCU viewpoint. */
-bool rcu_is_idle_cpu(int cpu)
-{
- return rcu_dynticks_in_eqs(rcu_dynticks_snap(cpu));
-}
-
/*
* Return true if the CPU corresponding to the specified rcu_data
* structure has spent some time in an extended quiescent state since
--
2.17.1
