irq_matrix_reserve_managed(9)

📦 version 7.3.1, in nixpkgs unstable

💅 irq_matrix_reserve_managed — a kernel API manual moment 🎀

okay so bestie, welcome to irq_matrix_reserve_managed(9), straight out of the Kernel API Manual ✨ this one is short and sweet and honestly kind of iconic for it 💖

🌸 NAME 🌸

irq_matrix_reserve_managed — Reserve a managed interrupt in a CPU map 🗺️✨

🦋 SYNOPSIS 🦋

int irq_matrix_reserve_managed (struct irq_matrix *m , const struct
       cpumask *msk );

like, that's the whole signature, no cap 💅

🎀 ARGUMENTS 🎀

  • m — Matrix pointer 🧚 the matrix in question, bestie
  • msk — On which CPUs the bits should be reserved. 📍 so like, which CPUs get the reservation vibes

🌈 DESCRIPTION 🌈

okay so the tea ☕: you can call this for offline CPUs. fr fr, offline CPUs are welcome here 🫶

but listen — this will only reserve one bit on all CPUs in msk 💀 and it's not guaranteed that the bits are at the same offset on all CPUs. so like, same vibe, different position 😭 don't assume they line up, that's the whole warning periodt 👑

⭐ SEE ALSO ⭐

Kernel file ./kernel/irq/matrix.c and honestly the whole friend group 🫶:

🍓 reminder bestie: one bit per CPU in msk, and the offsets are not promised to match. that's it, that's the caveat 💖

mwah 💋 this little page lives in ./kernel/irq and it was dated October 2026 — go forth and reserve those managed interrupts responsibly, queen 👑🌸

📦 where this page comes from