rcu_is_cpu_rrupt_from_idle(9)

💫 rcu_is_cpu_rrupt_from_idle(9) 💫

okay bestie, welcome to the Kernel API Manual — yes the whole manual, and today's main character is rcu_is_cpu_rrupt_from_idle, a function name that is genuinely a mouthful but lowkey ate 💅

---

✨ NAME ✨

rcu_is_cpu_rrupt_from_idle — see if 'interrupted' from idle 👀

---

🌸 SYNOPSIS 🌸

int rcu_is_cpu_rrupt_from_idle (void );

---

🎀 ARGUMENTS 🎀

• void — no arguments. literally none. zero. she takes nothing, she gives everything 🫶

---

🦋 DESCRIPTION 🦋

okay so here's the vibe: if the current CPU is idle and running at a first-level (not nested) interrupt, or directly, from idle, then it returns true. slay 💖

⚠️ real talk though — the caller must have at least disabled IRQs. that's not a suggestion, that's the rule, no cap, don't come crying to me if you skip it 😭

---

🔥 SEE ALSO 🔥

Kernel file ./kernel/rcu/tree.c and honestly her whole friend group:

• rcu_softirq_qs(9)
• rcu_watching_snap_stopped_since(9)
• rcu_irq_exit_check_preempt(9)
• __rcu_irq_enter_check_tick(9)
• rcu_is_watching(9)
• rcu_set_gpwrap_lag(9)
• call_rcu_hurry(9)
• call_rcu(9)
• synchronize_rcu(9)
• get_completed_synchronize_rcu_full(9)
• get_state_synchronize_rcu(9)
• get_state_synchronize_rcu_full(9)
• start_poll_synchronize_rcu(9)
• start_poll_synchronize_rcu_full(9)
• poll_state_synchronize_rcu(9)
• poll_state_synchronize_rcu_full(9)
• cond_synchronize_rcu(9)
• cond_synchronize_rcu_full(9)
• rcu_barrier(9)
• rcu_barrier_throttled(9)

like, the whole squad showed up 💀👑

---

✨ that's the whole page bestie, hope it slayed ✨ sourced from ./kernel/rcu, dated October 2026, and signed off as none other than rcu_is_cpu_rrupt_from_idle(9) herself — periodt 💜🌈