__devm_irq_alloc_descs(9)

💖 __devm_irq_alloc_descs — like, the managed-device irq descriptor allocator, bestie 💖

okay so real talk: this is the Kernel API Manual entry for __devm_irq_alloc_descs(9), and it's the function that goes "hey, I'mma grab you a whole range of irq descriptors, and I'mma do it in a devres-managed way so it cleans itself up later." main character energy honestly 👑

---

✨ NAME ✨

__devm_irq_alloc_descs — allocate and initialize a range of irq descriptors for a managed device 🫶

Like yes it allocates, and yes it initializes, it's doing both, it's multitasking, we love a multihyphenate.

---

🌸 SYNOPSIS 🌸

int __devm_irq_alloc_descs (struct device *dev , int irq , unsigned int
from , unsigned int cnt , int node , struct module *owner , const struct
irq_affinity_desc *affinity );

Seven arguments. Seven. Count 'em. She's thorough and we respect that 💅

---

🎀 ARGUMENTS 🎀

• dev — the device you're allocating these descriptors for. Your fave. The whole reason this is "devm" and not just a random bare alloc 😌
• irq — if irq >= 0, you're allocating for a specific irq number. Like requesting a particular seat at the table, periodt.
• from — where to start the search from, irq-number-wise. The starting line. The launchpad 🚀
• cnt — how many consecutive irqs you want. Consecutive!! As in next-to-each-other!! A lil squad of irqs 🌈
• node — your preferred node for the irq descriptor to be allocated on. Location, location, location 🦋
• owner — the owning module. Can be NULL btw, it's chill like that, no pressure.
• affinity — optional pointer to an irq_affinity_desc array of size cnt that hints where the irq descriptors should be allocated and which default affinities to use. A hint, bestie — an advisory lil suggestion 💜

---

🔥 DESCRIPTION 🔥

Returns the first irq number, or an error code.

That's it. That's the whole description. Short king behavior, honestly, but it said what it said — you get the first irq number back, or you get an error code, and there is no in-between 🌸

---

💀 NOTE 💀

Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.

fr fr, this is the low-level one — the devm_irq_alloc_desc* wrappers exist so you don't have to sit here passing seven arguments like a Victorian orphan. Save yourself 🙈

---

👑 SEE ALSO 👑

Kernel file ./kernel/irq/devres.c — go read it, it's giving source of truth ⭐

• devm_request_threaded_irq(9)
• devm_request_any_context_irq(9)
• devm_free_irq(9)
• devm_irq_alloc_generic_chip(9)
• devm_irq_setup_generic_chip(9)
• devm_irq_domain_instantiate(9)

A whole friend group of devm irq functions, and they all ate 💅✨

---

okay that's the page!! it lives in ./kernel/irq, it's dated October 2026, and yeah the page title is still __devm_irq_alloc_descs(9) because she's iconic and doesn't need a rebrand 🎀 💖🧚‍♀️