is_zero_folio(9)

💅 is_zero_folio(9) — a Kernel API Manual moment ✨

🎀 NAME 🎀

is_zero_folio — query if a folio is a zero page. That's the name, bestie: it's giving literal zero-page vibe check 💅

✨ SYNOPSIS ✨

Okay so the signature is literally:

bool is_zero_folio (const struct folio *folio );

🦋 ARGUMENTS 🦋

• folio — the folio to query. That's the one we're checking, bestie 👀

🌸 DESCRIPTION 🌸

This returns true if folio is one of the permanent zero pages. That's the whole tea. 🍵 It's a boolean vibe check on permanent zero pages — no cap, that's it. ✨

👑 SEE ALSO 👑

Okay so the SEE ALSO squad is huge and I'm obsessed. Every reference is here, no skips, periodt:

• Kernel file: ./include/linux/mm.h — home base 🏠
• 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)
• 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)

🌈 Bye bestie — source/version: ./include/linux, date: October 2026. Slay and stay zero-page-aware! 💖