lookup_resource(9)

💖 lookup_resource(9) 💖

okay so welcome to the Kernel API Manual, bestie ✨ today’s main character is lookup_resource, and it’s giving “find an existing resource by its start address” energy. lowkey simple, highkey useful. 🎀

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🌸 NAME 🌸

lookup_resource — find an existing resource by a resource start address. periodt. 🫶

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✨ SYNOPSIS ✨

struct resource * lookup_resource (struct resource *root ,
resource_size_t start );

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🎀 ARGUMENTS 🎀

• root — root resource descriptor. the root of the whole situation, iykyk. 🌱
• start — resource start address. literally the address we’re checking for, bestie. 📍

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💅 DESCRIPTION 💅

Returns a pointer to the resource if it’s found, NULL otherwise. that’s the whole plot. no cap. 😭💖

so yeah: found = you get a pointer to the resource; not found = NULL. clean, simple, ate. 👑

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👑 SEE ALSO 👑

Kernel file: ./kernel/resource.c 🗂️ — and the resource-adjacent besties are all right here:

• request_resource_conflict(9)
• request_resource(9)
• release_resource(9)
• find_next_res(9)
• walk_iomem_res_desc(9)
• region_intersects(9)
• find_resource_space(9)
• reallocate_resource(9)
• allocate_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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mwah 💋 that’s the whole page, bestie! source/version: ./kernel · date: October 2026. byeee 🦋✨