ib_dereg_mr_user(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, we're looking at ib_dereg_mr_user(9) from the Kernel API Manual, and it's giving "tiny cleanup function with one very important job" energy. no cap, it's shorter than a TikTok attention span, but every detail matters. 💖

🌸 NAME 🌸

ib_dereg_mr_user — deregisters a memory region and removes it from the HCA translation table.

✨ SYNOPSIS ✨

int ib_dereg_mr_user (struct ib_mr *mr , struct ib_udata *udata );

🎀 ARGUMENTS 🎀

  • mr — the memory region to deregister. that's the thing getting its goodbye moment. 👋
  • udata — valid user data, or NULL for a kernel object. so bestie, user data if it's user vibes, NULL if it's kernel-object vibes. ✨

💅 DESCRIPTION 💅

okay, here's the tea: this function can fail, if the memory region has memory windows bound to it. that's the whole caveat, and it's lowkey important — if those memory windows are still bound to it, failure is absolutely on the table. no extra lore, no secret options, just that warning. 💀

🦋 SEE ALSO 🦋

the whole friend group lives around the kernel file ./include/rdma/ib_verbs.h, and here's the full guest list — no skipping, no cap:

source/version vibes: ./include/rdma, October 2026, page ib_dereg_mr_user(9). that's the footer tea, bestie — now go deregister that memory region responsibly 💅✨

📦 where this page comes from