folio_nr_pages(9)

💅 folio_nr_pages — Kernel API Manual ✨

okay so bestie, welcome to folio_nr_pages(9), the littlest icon in the kernel API manual. she tells you how many pages are in a folio, and honestly? she ate. 🎀

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🌸 NAME 🌸

folio_nr_pages — literally just the number of pages in the folio. that's it. that's the whole gig. no cap. 💖

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✨ SYNOPSIS ✨

unsigned long folio_nr_pages (const struct folio *folio );

look at her. one argument. clean lines. main character energy fr fr. 🦋

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🫶 ARGUMENTS 🫶

• folio — the folio. yes, that's the entire description. she's the folio. the folio in question. the one we're counting pages for. iconic minimalism, ngl. 💅

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🔥 RETURN 🔥

A positive power of two. 🌈

like, a positive one, and a power of two — so 1, 2, 4, 8, 16, etc. not zero, not three, not some cursed middle value. don't be weird about it. ⭐

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👑 SEE ALSO 👑

Kernel file ./include/linux/mm.h, plus this whole friend group right here — every single one, no skipping, we do not leave anyone on read: 💜

• folio_page_idx(9)
• vma_flag_t(9)
• fault_flag_allow_retry_first(9)
• vma_kernel_pagesize(9)
• folio_order(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_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)

like a whole group chat of nine-section girlies. go say hi. 😭💖

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reminder bestie: this page lives at ./include/linux, dated October 2026, and the manual it's chilling in is the Kernel API Manual. take care of her. 🧚💜

anyway that's the whole page, ily, go count some pages 🍓💅🫶