irqentry_exi..._kernel_mode(9)

💅 irqentry_exit_to_kernel_mode(9) — like, the Kernel API Manual's main character ✨

okay so bestie, buckle up 🎀 this one's from the Kernel API Manual and it's giving "quietly doing the most important cleanup work in the whole kernel" energy. no cap.

🌸 NAME 🌸

irqentry_exit_to_kernel_mode — Run preempt checks and establish state after invoking the interrupt handler 💖

✨ SYNOPSIS ✨

void irqentry_exit_to_kernel_mode (struct pt_regs *regs ,
irqentry_state_t state );

🦋 ARGUMENTS 🦋

• regs — Pointer to current's pt_regs. literally just the regs for whoever's running rn 🫶
• state — the return value from the matching call to irqentry_enter_from_kernel_mode. matching!! as in they're a set, they're a duo, they're endgame 👑

🔥 DESCRIPTION 🔥

So this is the counterpart of irqentry_enter_from_kernel_mode, and the way it works is it combines the calls to irqentry_exit_to_kernel_mode_preempt and irqentry_exit_to_kernel_mode_after_preempt for you. one function, two jobs, ate and left no crumbs 💅

The requirement for the CPU state? it can schedule. that's the vibe check, that's the entry fee, no exceptions 🙈

After the function returns, the tracing, lockdep and RCU state transitions are completed — like fully done, wrapped up, finished — and the caller must return directly to the interrupted context. directly!! don't wander off, don't stop for a snack, go straight there 🏃‍♀️💨

⭐ SEE ALSO ⭐

• Kernel file ./include/linux/irq-entry-common.h 📁
• arch_enter_from_user_mode(9)
• arch_in_rcu_eqs(9)
• enter_from_user_mode(9)
• arch_exit_to_user_mode_work(9)
• arch_exit_to_user_mode_prepare(9)
• arch_exit_to_user_mode(9)
• arch_do_signal_or_restart(9)
• __exit_to_user_mode_prepare(9)
• syscall_exit_to_user_mode_prepare(9)
• irqentry_exit_to_user_mode_prepare(9)
• exit_to_user_mode(9)
• irqentry_enter_from_user_mode(9)
• irqentry_exit_to_user_mode(9)
• struct irqentry_state(9)
• irqentry_enter_from_kernel_mode(9)
• irqentry_exit_to_kernel_mode_preempt(9)
• irqentry_exit_to_kernel_mode_after_preempt(9)
• irqentry_enter(9)
• irqentry_exit(9)
• irqentry_nmi_enter(9)
• irqentry_nmi_exit(9)

and that's the whole page bestie, hope it slayed for you 🌈💜

sign-off time 🎀: this one lives over in ./include/linux and the version stamp on it says October 2026 — so yeah, she's from the future, iconic behavior honestly 👑✨