folio_mapped(9)

✨ NAME ✨

Okay so folio_mapped(9) — direct from the Kernel API Manual, bestie — is literally the “is this folio mapped into userspace?” check. That’s the whole assignment. 💅

🦋 SYNOPSIS 🦋

bool folio_mapped (const struct folio *folio );

🎀 ARGUMENTS 🎀

• folio — the folio. Yep, that’s the one we’re checking. ✨

🔥 RETURN 🔥

True if any page in this folio is referenced by user page tables. No cap. 💖

🌸 SEE ALSO 🌸

Kernel file ./include/linux/mm.h, plus the whole iconic reference list: 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), 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).

That’s the page, bestie! Source/version: ./include/linux; dated October 2026; and yes, we were absolutely talking about folio_mapped(9) the whole time. Slay. 🫶💖