folio_order(9)

💅 folio_order(9) — from the Kernel API Manual, bestie

okay so picture this: you're deep in the kernel, holding a folio, and you NEED to know how big its allocation order is. that's the whole gig. this page is your girl. ✨

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🌸 NAME 🌸

folio_order — literally just the allocation order of a folio. that's it, that's the function. 🎀

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🦋 SYNOPSIS 🦋

unsigned int folio_order (const struct folio *folio );

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💜 ARGUMENTS 💜

• folio — the folio. the one and only. the main character. 👑

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✨ DESCRIPTION ✨

so a folio is composed of 2^order pages — like, that's its whole thing. if you wanna know what "order" actually means, go read get_order. no cap, that's where the definition lives. 📖

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🔥 RETURN 🔥

the order of the folio. slay, that's the answer. 💅

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🌈 SEE ALSO 🌈

okay this list is LONG, hydrate before reading, but every single one is here because they're all friends of the show 🫶 — kernel file ./include/linux/mm.h:

• folio_page_idx(9), vma_flag_t(9), fault_flag_allow_retry_first(9), vma_kernel_pagesize(9), folio_reset_order(9), folio_mapcount(9), folio_mapped(9), thp_order(9), thp_size(9), folio_get(9), folio_put(9), folio_put_refs(9), folios_put(9), vma_flags_is_cow_mapping(9), vma_is_cow_mapping(9), vma_desc_is_cow_mapping(9), folio_pfn(9), folio_mk_pte(9), folio_mk_pmd(9), folio_mk_pud(9), folio_maybe_dma_pinned(9), is_zero_page(9), is_zero_folio(9), folio_nr_pages(9), folio_next(9), folio_shift(9), folio_size(9), folio_maybe_mapped_shared(9), folio_expected_ref_count(9), zap_vma(9), ptdesc_address(9), ptdesc_set_kernel(9), ptdesc_clear_kernel(9), ptdesc_test_kernel(9), pagetable_alloc(9), pagetable_free(9), vma_lookup(9), vma_start_pgoff(9), vma_end_pgoff(9), vma_last_pgoff(9), vma_start_anon_pgoff(9), vma_end_anon_pgoff(9), vma_last_anon_pgoff(9), mmap_action_remap(9), mmap_action_remap_full(9), mmap_action_ioremap(9), mmap_action_ioremap_full(9), mmap_action_simple_ioremap(9), mmap_action_map_kernel_pages(9), mmap_action_map_kernel_pages_full(9), range_is_subset(9), range_in_vma(9), range_in_vma_desc(9), clear_pages(9)

iykyk, that's a whole friend group. 💀

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and that's the page!! source is ./include/linux, version date October 2026 — mwah, iconic, no notes. 🍓💖