folio_reset_order(9)

💖 folio_reset_order(9) 💖

okay so welcome to the Kernel API Manual, bestie — this is the page for folio_reset_order(9), and it's lowkey a very specific little kernel helper. ✨

---

🌸 NAME 🌸

folio_reset_order — reset the folio order and derived _nr_pages. fr fr, that's the whole name-vibe. 💅

---

✨ SYNOPSIS ✨

the signature is this exact thing, so copy it character-for-character, bestie:

void folio_reset_order (struct folio *folio );

---

🎀 ARGUMENTS 🎀

• folio — the folio. literally the only argument, and it's giving "the folio" 🫶

---

💅 DESCRIPTION 💅

okay so what it does: it resets the order and the derived _nr_pages to 0. 🎀

⚠️ big caveat bestie: it must only be used in the process of splitting large folios. that's the rule, no cap. 💀

---

🌈 SEE ALSO 🌈

Kernel file: ./include/linux/mm.h — here's the whole cross-reference squad, all exact:

• folio_page_idx(9)
• vma_flag_t(9)
• fault_flag_allow_retry_first(9)
• vma_kernel_pagesize(9)
• folio_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)

---

okay that's the page bestie 💅 this folio_reset_order(9) page comes from the ./include/linux source/version and is dated October 2026 🫶✨