devm_iounmap(9)

💅 devm_iounmap(9) — Kernel API Manual bestie ✨

okay so we're in the Kernel API Manual, and this page is literally about devm_iounmap(9) — the managed iounmap() icon 💅. No cap, it's short and sweet, but every detail matters, fr fr.

🌸 NAME 🌸

devm_iounmap — Managed iounmap()

✨ SYNOPSIS ✨

void devm_iounmap (struct device *dev , void __iomem *addr );

🎀 ARGUMENTS 🎀

• dev — the generic device to unmap for 🫶
• addr — the address to unmap 📍

🦋 DESCRIPTION 🦋

Managed iounmap(). That's the tea ☕.

🚨 bestie, addr must have been mapped using devm_ioremap*() — like, non-negotiable, that's the whole vibe check 💀✨

🌈 SEE ALSO 🌈

• Kernel file ./lib/devres.c — the source spot, iykyk 👑
• devm_ioremap(9)
• devm_ioremap_uc(9)
• devm_ioremap_wc(9)
• devm_ioremap_resource(9)
• devm_ioremap_resource_wc(9)
• devm_ioport_map(9)
• devm_ioport_unmap(9)
• devm_arch_phys_wc_add(9)
• devm_arch_io_reserve_memtype_wc(9)

🫶 that's the whole page, bestie — signed off from ./lib, dated October 2026, and yes the page is still devm_iounmap(9) ✨💖