devm_irq_domain_create_sim(9)

okay so this is devm_irq_domain_create_sim(9) from the Kernel API Manual 🎀✨ bestie, we're making an interrupt simulator for a managed device and it's giving kernel-core main character energy.

💖 NAME 💖

devm_irq_domain_create_sim — create a brand-new interrupt simulator for a managed device. Slay.

✨ SYNOPSIS ✨

struct irq_domain * devm_irq_domain_create_sim (struct device *dev ,
       struct fwnode_handle *fwnode , unsigned int num_irqs );

🧚 ARGUMENTS 🧚

• dev — the device you're initializing the simulator object for. That's the whole assignment, no cap.
• fwnode — the struct fwnode_handle that's getting associated with this domain. Iconic pairing fr fr.
• num_irqs — how many interrupts to allocate. The count. The number. Periodt.

🔥 DESCRIPTION 🔥

Okay so the vibe check on the return: on success, you get a new irq_domain object back — yes bestie, a whole new object ✨. On failure, it's a negative errno wrapped with ERR_PTR, so the error is literally traveling in disguise 😭. That's the contract.

🌈 SEE ALSO 🌈

• Kernel file ./kernel/irq/irq_sim.c
• irq_domain_create_sim(9)
• irq_domain_remove_sim(9)

🫶 cute little footer sign-off: source/version ./kernel/irq, date October 2026, page devm_irq_domain_create_sim(9). byeee, go make that simulator 💅💖