hwspin_lock...ut_in_atomic(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME

hwspin_lock_timeout_in_atomic — lock an hwspinlock with timeout limit 🎀

✨ SYNOPSIS

int hwspin_lock_timeout_in_atomic (struct hwspinlock *hwlock , unsigned
int to );

🌸 ARGUMENTS

  • hwlock — the hwspinlock you're trying to lock, bestie. like, the actual lock object 🫶
  • to — timeout value in msecs. yes. milliseconds. write it down 📝

💖 DESCRIPTION

okay so here's the tea ☕ — this function locks the underlying hwlock. that's it, that's the job.

but if the hwlock is already taken? 👀 the function will busy loop waiting for it to be released — just spinning, spinning, spinning, main character energy — but it gives up when timeout msecs have elapsed. no cap, it will genuinely walk away 💀

🚨 important-ish warning, lowkey highkey: this function shall be called only from an atomic context, and the timeout value shall not exceed a few msecs. like, a few. don't be out here passing to = 30000 and acting surprised 🙈

return value vibes: returns 0 when the hwlock was successfully taken 🎉 and an appropriate error code otherwise — most notably an -ETIMEDOUT if the hwlock is still busy after timeout msecs 😭

and the iconic part: the function will never sleep. not once. not ever. it's built different 🧚

🦋 SEE ALSO

kernel file ./include/linux/hwspinlock.h — and the whole friend group, fr fr:

✨ that's the whole page bestie, you ate that ✨

source vibes: ./include/linux, dated October 2026 — screenshot it, cite it, slay 💅💖👑

📦 where this page comes from