ib_umem_odp_alloc_implicit(9)

💅 ib_umem_odp_alloc_implicit(9) 💅

okay bestie, buckle up — this one's from the Kernel API Manual, and it's literally the blueprint for spawning implicit-ODP umems. yes, that's a thing. stay with me 🫶

---

✨ NAME ✨

ib_umem_odp_alloc_implicit — allocate a parent implicit ODP umem 🌸

---

🎀 SYNOPSIS 🎀

struct ib_umem_odp * ib_umem_odp_alloc_implicit (struct ib_device *device , int access );

like, that's the whole call. no cap. ✨

---

🦋 ARGUMENTS 🦋

• device — the IB device that's gonna create the UMEM. it's giving founder energy 👑
• access — the ib_reg_mr access flags. the vibe parameters, if you will 💅

---

💖 DESCRIPTION 💖

so here's the tea, bestie: implicit ODP umems are the lowkey minimal ones. they do not have a VA range, and they do not have any page lists. like, none. empty. not a single one. 🙈

so what are they even for?? glad you asked — they exist only to hold the per_mm reference, which is what helps the driver create children umems. think of it as the parent umem that's just there to make sure the family stays together. main character energy, but for reference counting 🧚

---

🔥 SEE ALSO 🔥

• Kernel file ./drivers/infiniband/core/umem_odp.c
• ib_umem_odp_alloc_child(9)
• ib_umem_odp_get(9)
• ib_umem_odp_map_dma_and_lock(9)

go read those next, i promise it's worth it — the whole friend group slays 💜

---

🌸 okay that's the whole page, bestie! this iconic little entry lives in ./drivers/infiniband/core, was stamped October 2026, and goes by ib_umem_odp_alloc_implicit(9) — mwah, periodt 💋