release_mem...n_adjustable(9)

💖 release_mem_region_adjustable — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and it's about release_mem_region_adjustable, and honestly? she's a lil niche but she's iconic. let's get into it 💅

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✨ NAME ✨

release_mem_region_adjustable — release a previously reserved memory region 🦋

✨ SYNOPSIS ✨

void release_mem_region_adjustable (resource_size_t start ,
       resource_size_t size );

✨ ARGUMENTS ✨

• start — the resource start address 📍
• size — the resource region size 📏

✨ DESCRIPTION ✨

ok so real talk: this interface is intended for memory hot-delete 🫶 The requested region gets released from a currently busy memory resource. The way it works is the requested region must either match exactly or fit into a single busy resource entry. In that latter case, the remaining resource is adjusted accordingly — she trims it, periodt ✂️

✨ NOTE ✨

• Additional release conditions, such as an overlapping region, can be supported after they are confirmed as valid cases 👀 (like, not yet, bestie — it has to be validated first, no cap)
• When a busy memory resource gets split into two entries, its children are reassigned to the correct parent based on their range. If a child memory resource overlaps with more than one parent, enhance the logic as needed 🧚 (yes, you — go enhance it, iykyk)

💀 lowkey the split-and-reassign thing is exactly where it gets spicy, so don't sleep on the children logic.

✨ SEE ALSO ✨

Kernel file ./kernel/resource.c plus a whole friend group of related calls 💜

• 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)
• 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)
• 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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that's the whole page, bestie — go forth and hot-delete responsibly 🌈

🌷 source/version: ./kernel · date: October 2026 · and we're back at release_mem...n_adjustable(9) for the footer, mwah 💋