hwspin_unlock_irq(9)

📦 version 7.3.1, in nixpkgs unstable

💅 hwspin_unlock_irq(9) — from the Kernel API Manual, bestie 🎀

okay so real talk, this one's from the Kernel API Manual and it's lowkey the cool-down twin of hwspin_lock_irq. let's get into it ✨

✨ NAME ✨

hwspin_unlock_irq — unlock a hwspinlock and turn interrupts back on, periodt 🔓💖

🌸 SYNOPSIS 🌸

void hwspin_unlock_irq (struct hwspinlock *hwlock );

yes bestie that's the whole signature, it returns void, no surprises, no drama 🫶

🦋 ARGUMENTS 🦋

  • hwlock — a previously-acquired hwspinlock that we wanna unlock. it's the exact same lock you grabbed before, no substitutions, no imposters 🙈

👑 DESCRIPTION 👑

so here's the tea ☕: this function does three iconic things at once —

  • it unlocks that specific hwspinlock 🔓
  • it enables preemption ⚡
  • it enables local interrupts 💫

think of it as the undoing of hwspin_lock_irq — the "ok we're done here, everybody back in" moment 🌈

the important caveat, no cap: hwlock must already be locked before you call this (like, for example, by hwspin_trylock_irq). calling unlock on a hwlock that's already unlocked is a bug. fr fr, don't do it 💀

🔥 SEE ALSO 🔥

if you wanna go deeper (and you know you do), the kernel file is ./include/linux/hwspinlock.h and here's the whole friend group 👇

mwah 💋 that's the whole page! brought to you from ./include/linux, dated October 2026, and yeah it's literally titled hwspin_unlock_irq(9) — go unlock some locks responsibly, bestie 🧚💜

📦 where this page comes from