swap_alloc_hibernation_slot(9)

📦 version 7.3.1, in nixpkgs unstable

💅 swap_alloc_hibernation_slot(9) — like, the whole kernel API manual vibe ✨

okay bestie, welcome to the Kernel API Manual page for swap_alloc_hibernation_slot(9) — yes that's the real name and yes it's a mouthful, but we move 🫶

🌸 NAME 🌸

swap_alloc_hibernation_slot — literally just allocates a swap slot for hibernation. that's the whole gig. iconic behaviour, no notes 💅

✨ SYNOPSIS ✨

swp_entry_t swap_alloc_hibernation_slot (int type );

🎀 ARGUMENTS 🎀

  • type — the swap device type index you're allocating from. that's it, that's the argument 🦋

🧚 DESCRIPTION 🧚

okay so here's the thing, and it's lowkey important 👀 — the caller has got to make sure the swap device is stable first. and there are exactly two ways to do that, no cap:

  • by pinning it — that's SWP_HIBERNATION babe 🎀
  • or by freezing user-space ❄️

do one of those, or don't come crying to me. main character energy only works when the device is stable, fr fr 😭

🔥 RETURN 🔥

  • a valid swp_entry_t on success 🎉
  • or an empty entry (val == 0) on failure 💀

that's your vibe check right there — val == 0 means it did not slay 🙈

👑 SEE ALSO 👑

kernel file ./mm/swapfile.c — and the whole friend group, all of these besties right here:

💖 reminder bestie: SWP_HIBERNATION pinning or freezing user-space — pick one, or the swap device is not stable and that's on you 🫶

🌈 and that's the page! source is ./mm, dated October 2026, and the whole thing is filed under swap_alloc_hibernation_slot(9) — mwah, periodt 💋✨

📦 where this page comes from