walk_iomem_res_desc(9)

💖 walk_iomem_res_desc(9) — Kernel API Manual 💖

okay bestie, you're reading the walk_iomem_res_desc(9) page from the Kernel API Manual, and it's giving resource-walk realness ✨ let's go.

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🌸 NAME 🌸

walk_iomem_res_desc — takes a little stroll through iomem resources and calls func() for the matching resource ranges. *

(yes, that trailing * is literally part of the NAME line — details are the moment 💅)

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✨ SYNOPSIS ✨

int walk_iomem_res_desc (unsigned long desc , unsigned long flags , u64
start , u64 end , void *arg , int (*func)(struct resource *, void *) );

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🎀 ARGUMENTS 🎀

• desc — the I/O resource descriptor. Pass IORES_DESC_NONE if you want to skip the desc check entirely, bestie 💖
• flags — the I/O resource flags.
• start — start addr.
• end — end addr.
• arg — the function argument that gets handed to the callback func.
• func — the callback function; it gets called for each qualifying resource area.

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🦋 DESCRIPTION 🦋

So the valid candidates are all the memory ranges that overlap start,end and also match both flags and desc. That's the whole vibe check: overlap + matching flags + matching desc = candidate 🦋💖

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💅 NOTE 💅

For a new descriptor search, define a new IORES_DESC in <linux/ioport.h> and set it in 'desc' of a target resource entry. That's the move 👑

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🔥 SEE ALSO 🔥

Kernel file ./kernel/resource.c — and then the whole resource-friend group chat:

• request_resource_conflict(9)
• request_resource(9)
• release_resource(9)
• find_next_res(9)
• region_intersects(9)
• find_resource_space(9)
• reallocate_resource(9)
• allocate_resource(9)
• lookup_resource(9)
• insert_resource_conflict(9)
• insert_resource(9)
• insert_resource_expand_to_fit(9)
• remove_resource(9)
• adjust_resource(9)
• resource_alignment(9)
• __request_region(9)
• __release_region(9)
• release_mem_region_adjustable(9)
• merge_system_ram_resource(9)
• devm_request_resource(9)
• devm_release_resource(9)
• devm_request_free_mem_region(9)
• alloc_free_mem_region(9)

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okay that's the page, bestie 💋 source/version: ./kernel; date: October 2026. walk_iomem_res_desc(9) out — slay responsibly 🫶