devm_arch_i...e_memtype_wc(9)

👑 devm_arch_i...e_memtype_wc — the Kernel API Manual, section 9, bestie 💅

okay so real talk, this is devm_arch_io_reserve_memtype_wc(9) from the Kernel API Manual, section 9, and she's literally the managed, devres-flavoured version of her non-managed sister. same energy, way less cleanup stress. periodt. ✨

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🌸 NAME 🌸

devm_arch_io_reserve_memtype_wc — the managed glow-up of arch_io_reserve_memtype_wc(). it's giving "i'll handle the release for you so you can live your life." 🫶

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✨ SYNOPSIS ✨

int devm_arch_io_reserve_memtype_wc (struct device *dev ,
resource_size_t start , resource_size_t size );

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🎀 ARGUMENTS 🎀

• dev — the managed device, aka the main character whose lifetime this whole thing is tied to. everything gets cleaned up when she leaves. 🦋
• start — memory base address. where the party starts, literally.
• size — size of the memory range. how much of the vibe we're reserving. 📏

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💖 DESCRIPTION 💖

so what she does is: she reserves a memory range with WC caching by calling through to arch_io_reserve_memtype_wc, and then she sets up a release callback for you. 😭 iconic. that's the managed part — you don't have to remember to undo it yourself, because she remembers for you. no cap.

if you want the whole deep-dive on the actual reservation behaviour, the page says to go see arch_io_reserve_memtype_wc for more information. she's not gonna repeat her sister's whole story, iykyk. 🌈

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🔥 SEE ALSO 🔥

• Kernel file ./lib/devres.c
• devm_ioremap(9)
• devm_ioremap_uc(9)
• devm_ioremap_wc(9)
• devm_iounmap(9)
• devm_ioremap_resource(9)
• devm_ioremap_resource_wc(9)
• devm_ioport_map(9)
• devm_ioport_unmap(9)
• devm_arch_phys_wc_add(9)

like, the whole devres friend group showed up. love that for them. 💜

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mwah 💋 this lil' page lives in ./lib, and the version date on it is October 2026 — so yeah, she's from the future and she's still slaying. catch you in section 9, bestie 🎀✨