memblock_double_array(9)

💅 memblock_double_array(9) 💅

okay so bestie, welcome to the memblock_double_array(9) page from the Kernel API Manual. we're gonna get you comfy with it, no cap. 🫶

🎀 NAME 🎀

memblock_double_array — double the size of the memblock regions array

✨ SYNOPSIS ✨

int __init_memblock memblock_double_array (struct memblock_type *type ,
phys_addr_t new_area_start , phys_addr_t new_area_size );

🌸 ARGUMENTS 🌸

• type — the memblock type of the regions array that's getting doubled, slay.
• new_area_start — starting address of the memory range to avoid overlap with. literally where it begins.
• new_area_size — size of the memory range to avoid overlap with. how big it is, bestie.

🦋 DESCRIPTION 🦋

So here's the vibe: this function doubles the size of the type regions array. ✨

And the little plot twist is this: if memblock is being used to allocate memory for a new reserved regions array, and there's a previously allocated memory range [new_area_start, new_area_start + new_area_size] waiting to be reserved, then it makes sure the memory used by the new array does not overlap. highkey important, lowkey iconic.

🔥 RETURN 🔥

• 0 on success
• -1 on failure

💖 SEE ALSO 💖

• Kernel file ./mm/memblock.c memblock overview(9)
• __memblock_find_range_bottom_up(9)
• __memblock_find_range_top_down(9)
• memblock_find_in_range_node(9)
• memblock_find_in_range(9)
• memblock_discard(9)
• memblock_merge_regions(9)
• memblock_insert_region(9)
• memblock_add_range(9)
• memblock_add_node(9)
• memblock_add(9)
• memblock_validate_numa_coverage(9)
• memblock_isolate_range(9)
• memblock_free(9)
• memblock_phys_free(9)
• memblock_setclr_flag(9)
• memblock_mark_hotplug(9)
• memblock_clear_hotplug(9)
• memblock_mark_mirror(9)
• memblock_mark_nomap(9)
• memblock_clear_nomap(9)
• memblock_reserved_mark_noinit(9)
• memblock_reserved_mark_kern(9)
• memblock_mark_kho_scratch(9)
• memblock_clear_kho_scratch(9)
• __next_mem_range(9)
• __next_mem_range_rev(9)
• memblock_set_node(9)
• memblock_alloc_range_nid(9)
• memblock_phys_alloc_range(9)
• memblock_phys_alloc_try_nid(9)
• memblock_alloc_internal(9)
• memblock_alloc_exact_nid_raw(9)
• memblock_alloc_try_nid_raw(9)
• memblock_alloc_hugetlb(9)
• memblock_alloc_try_nid(9)
• __memblock_alloc_or_panic(9)
• memblock_estimated_nr_free_pages(9)
• memblock_is_region_memory(9)
• memblock_is_region_reserved(9)
• memblock_free_all(9)
• reserve_mem_find_by_name(9)
• reserve_mem_release_by_name(9)

okay that's the whole page, bestie. this one came from ./mm, dated October 2026, and it's the memblock_double_array(9) manual page. go double those arrays responsibly 💜🫶