amdgpu_hmm_register(9)

📦 version 7.3.1, in nixpkgs unstable

💅 amdgpu_hmm_register(9) 💅

okay so this is a page from the Kernel API Manual — yes, the kernel has a whole manual, she's iconic like that — and today's main character is amdgpu_hmm_register(9). buckle up bestie, it's a short one but she's important 🫶

✨ NAME ✨

amdgpu_hmm_register — registers a BO so it gets notifier updates, fr fr 💖

🌸 SYNOPSIS 🌸

int amdgpu_hmm_register (struct amdgpu_bo *bo , unsigned long addr );

like, that's the whole signature. no cap. two args, one int back. she's lowkey minimal 🎀

🦋 ARGUMENTS 🦋

  • bo — the amdgpu buffer object in question 💅 that's the thing we're registering, bestie
  • addr — the userptr addr we should monitor 👀 yeah, that exact one, keep your eyes on it

🔥 DESCRIPTION 🔥

so here's the vibe: this function registers a mmu_notifier for the given BO at the specified address. one BO, one address, one notifier — match made in heaven honestly 💖

and the return value? she's simple:

  • returns 0 on success ✨ (slay)
  • returns -ERRNO if anything goes wrong 😭 like, anything, that's the whole error contract, -ERRNO, that's it
ngl the error is literally just described as "if anything goes wrong" and honestly? relatable. same energy as my life rn 💀

👑 SEE ALSO 👑

if you're the kind of girlie who reads the whole source (respect), the kernel file lives at ./drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c 🗂️ and these are the siblings you should go say hi to:

and that's the page!! 🎀 big thank-you to ./drivers/gpu/drm/amd/amdgpu for hosting this whole situation, this is the October 2026 edition, go drink some water and unregister your notifiers properly 💜✨🌈

📦 where this page comes from