folio_get(9)

💅 folio_get(9) 💅

okay so welcome to the Kernel API Manual, bestie — this is the page for folio_get(9), and it is lowkey tiny but highkey important. 🫶

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🌸 NAME 🌸

folio_get — increment the reference count on a folio. That’s the whole assignment: bump that refcount, no cap. ✨

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✨ SYNOPSIS ✨

void folio_get (struct folio *folio );

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🎀 ARGUMENTS 🎀

• folio — the folio. That’s it. That’s the argument. The whole argument. 🎀

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🦋 CONTEXT 🦋

You can call this in any context, bestie — as long as you know that you have a refcount on the folio. Periodt. If you do not already have one, folio_try_get may be the right interface for you to use. 👑

Heads up, gorgeous: the refcount knowledge is the vibe check here. Don’t skip it. 💅

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💜 SEE ALSO 💜

Kernel file: ./include/linux/mm.h

the whole see-also squad, in order, no skips:

• 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_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)

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xoxo, your kernel bestie 🧚💖 — source/version: ./include/linux; date: October 2026. mwah! 💋