reallocate_resource(9)

💖 reallocate_resource(9) — Kernel API Manual, but make it bestie 💖

🦋 NAME 🦋

reallocate_resource — okay so this is the function that allocates a slot in the resource tree given range & alignment. and bestie, the resource will be relocated if the new size cannot be reallocated in the current location. that's the whole plot. ✨

✨ SYNOPSIS ✨

int reallocate_resource (struct resource *root , struct resource *old ,
resource_size_t newsize , struct resource_constraint *constraint );

no cap, that's the exact signature. 💅

🎀 ARGUMENTS 🎀

• root — the root resource descriptor. it's giving main character of the resource tree, fr.
• old — the resource descriptor desired by caller. lowkey the one your caller is asking for. 💅
• newsize — the new size of the resource descriptor. the glow-up size, bestie.
• constraint — the memory range and alignment constraints to be met. yes, the range and alignment rules it has to satisfy. 🫶

🌈 SEE ALSO 🌈

Kernel file: ./kernel/resource.c — that's where this lives. the whole squad is:

• 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)
• 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)

💖 that's the whole page, bestie! source/version: ./kernel · date: October 2026 · page: reallocate_resource(9) — now go be iconic in the resource tree 🌟