hwspin_unlock(9)

💖 NAME 💖

Okay bestie, welcome to hwspin_unlock(9) — yes, that's the manual name, and yes, this is the Kernel API Manual page for hwspin_unlock: the function that unlocks a hwspinlock. Iconic little cleanup moment, honestly. 🎀

---

✨ SYNOPSIS ✨

void hwspin_unlock (struct hwspinlock *hwlock );

---

🫶 ARGUMENTS 🫶

• hwlock — a previously-acquired hwspinlock which we want to unlock. That's the whole vibe: it's the lock you already grabbed, and now you're handing it back. 💅

---

🌸 DESCRIPTION 🌸

This function will unlock a specific hwspinlock and enable preemption back. Slay, preemption is back on the menu. ✨

But listen: hwlock must be already locked (e.g. by hwspin_trylock) before calling this function. Not me calling unlock on a lock that's already unlocked 💀 — that is a bug. Periodt. No cap. If it's already unlocked, you do not pass go, you do not collect $200, because calling unlock on a hwlock that is already unlocked is a bug.

Bestie, this is the “put it back” function. Only put back what you actually took. 🧚

---

🦋 SEE ALSO 🦋

Kernel file: ./include/linux/hwspinlock.h

The whole lock-and-unlock friend group, all here with their (9) energy:

• hwspin_trylock_irqsave(9)
• hwspin_trylock_irq(9)
• hwspin_trylock_raw(9)
• hwspin_trylock_in_atomic(9)
• hwspin_trylock(9)
• hwspin_lock_timeout_irqsave(9)
• hwspin_lock_timeout_irq(9)
• hwspin_lock_timeout_raw(9)
• hwspin_lock_timeout_in_atomic(9)
• hwspin_lock_timeout(9)
• hwspin_unlock_irqrestore(9)
• hwspin_unlock_irq(9)
• hwspin_unlock_raw(9)
• hwspin_unlock_in_atomic(9)

---

Cute little sign-off bestie: this page comes from ./include/linux, dated October 2026, and it is literally hwspin_unlock(9). Go unlock responsibly, mwah 💋💖