vm_map_pages_zero(9)

💖 vm_map_pages_zero(9) 💖

okay so this is a page from the Kernel API Manual, section 9, bestie — it's all about vm_map_pages_zero, and yes the name is a whole mouthful but we move 🫶

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✨ NAME ✨

vm_map_pages_zero — maps a range of kernel pages, and it starts at a zero offset 🌸

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🦋 SYNOPSIS 🦋

int vm_map_pages_zero (struct vm_area_struct *vma , struct page **pages
, unsigned long num );

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🎀 ARGUMENTS 🎀

• vma — the user vma you're mapping into, like this is the destination vibe 💅
• pages — a pointer to the array of source kernel pages, aka where the actual pages live 👑
• num — how many pages are in that page array, count 'em 🔥

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🌈 DESCRIPTION 🌈

So it's basically vm_map_pages, except it explicitly sets the offset to 0. That's the whole twist, no cap 😭

This function is intended for the drivers that did not consider vm_pgoff — like, they just never thought about it, and now this function has their back 💜

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⭐ CONTEXT ⭐

Process context, bestie. It gets called by mmap handlers. That's the vibe check 🧚

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💫 RETURN 💫

0 on success, and an error code otherwise. Slay when it's zero, weep when it's not 🙈

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🔥 SEE ALSO 🔥

Kernel file ./mm/memory.c — and the whole friend group is here, look at them all:

• free_pgd_range(9)
• free_pgtables(9)
• __vm_normal_page(9)
• vm_normal_page(9)
• vm_normal_folio(9)
• vm_normal_page_pmd(9)
• vm_normal_folio_pmd(9)
• vm_normal_page_pud(9)
• restore_exclusive_pte(9)
• cond_install_uffd_wp_ptes(9)
• zap_vma_for_reaping(9)
• unmap_vmas(9)
• zap_vma_range_batched(9)
• zap_vma_range(9)
• zap_special_vma_range(9)
• vm_insert_pages(9)
• vm_insert_page(9)
• vm_map_pages(9)
• vmf_insert_pfn_prot(9)
• vmf_insert_pfn(9)
• remap_pfn_range(9)
• vm_iomap_memory(9)
• __vmf_anon_prepare(9)
• finish_mkwrite_fault(9)
• unmap_mapping_folio(9)
• unmap_mapping_pages(9)
• unmap_mapping_range(9)
• set_pte_range(9)
• finish_fault(9)
• mm_account_fault(9)
• follow_pfnmap_start(9)
• follow_pfnmap_end(9)
• generic_access_phys(9)
• access_remote_vm(9)
• copy_remote_vm_str(9)
• folio_zero_user(9)

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ngl bestie, the "zero" in the name is doing exactly what it says on the tin — offset 0, periodt 💅

mwah, that's the page! 🎀 this lil beauty lives in ./mm and it's dated October 2026 — go off, kernel docs, you ate 💖✨