shmem_zero_setup(9)

📦 version 7.3.1, in nixpkgs unstable

💅 shmem_zero_setup — Kernel API Manual, section 9, bestie ✨

Okay so real talk, this page lives in the Kernel API Manual, section 9 — the kernel-API part of the man pages, iykyk. And it's about one very specific little function, so let's get into it 🎀

✨ NAME ✨

shmem_zero_setup — setup a shared anonymous mapping 🫶

Like, that's the whole vibe. It sets up a shared anonymous mapping. Periodt.

🌸 SYNOPSIS 🌸

int shmem_zero_setup (struct vm_area_struct *vma );

That's it. One argument, returns an int, and yes the spacing is exactly like that — don't come for me, I'm copying it character for character 💀

🦋 ARGUMENTS 🦋

  • vma — the vma to be mmapped, and no cap: it's prepared by do_mmap 👑 So by the time this function sees it, the setup work's already been done by somebody else. Main character energy from do_mmap, honestly.

⭐ RETURN ⭐

  • 0 on success
  • or error 😭

That's the entire return contract. Zero means slay, anything else means something went sideways.

🔥 SEE ALSO 🔥

Your girl is not gatekeeping the friend group. Here's the whole squad, plus the kernel file where they all hang out:

Kernel file ./mm/shmem.c:

💖 fr fr though — if you're poking at any of the above, go read the actual source in ./mm/shmem.c too. The man page is the vibe check, the source is the whole story.

Okay bye bestie, mwah 💋 This one's from the ./mm corner of the tree, dated October 2026 — stay hydrated, read your kernel docs, and don't forget to make before you ship 🧚‍♀️💜

📦 where this page comes from