__memblock_alloc_or_panic(9)

🌸 NAME 🌸

__memblock_alloc_or_panic — Try to allocate memory and panic on failure.

okay so this is the __memblock_alloc_or_panic(9) page from the Kernel API Manual ✨ and the name is literally giving the whole plot: it tries to allocate memory, and if that fails, it panics 😭💅.

✨ SYNOPSIS ✨

void * __memblock_alloc_or_panic (phys_addr_t size , phys_addr_t align ,
       const char *func );

🎀 ARGUMENTS 🎀

• size — size of memory block to be allocated in bytes. literally how many bytes you're asking for, bestie 📏
• align — alignment of the region and block's size. this is the alignment of the region and block's size, periodt ✨
• func — caller func name. the caller func name, for the record 🫶

💖 DESCRIPTION 💖

This function attempts to allocate memory using memblock_alloc, and in case of failure, it calls panic with the formatted message. So yeah: it tries, and if it fails, it does not ghost you — it calls panic with the formatted message 💀🔥.

This function should not be used directly, please use the macro memblock_alloc_or_panic. That's the important bit: do not call this one directly, use the macro memblock_alloc_or_panic instead, iykyk 🙈.

🦋 SEE ALSO 🦋

the whole crew starts with Kernel file ./mm/memblock.c memblock overview(9), then:

• __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_double_array(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_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)

and that's the whole page, bestie 💖 source/version ./mm, date October 2026, and yes, __memblock_alloc_or_panic(9) is iconic. periodt 🎀