__compat_vma_mmap(9)

💅 __compat_vma_mmap(9)

okay so bestie, welcome to the kernel API manual page for __compat_vma_mmap(9) — yes that's the manual name, it's giving "underscore-underscore" main character energy and we're obsessed 🫶

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✨ NAME ✨

__compat_vma_mmap — literally the same vibe as compat_vma_mmap(), except it's flexible about how the mmap_prepare callback gets invoked. which is super useful for drivers that invoke nested mmap_prepare callbacks inside an mmap() hook. iykyk 💅

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🎀 SYNOPSIS 🎀

int __compat_vma_mmap (struct vm_area_desc *desc , struct vm_area_struct
*vma );

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🌸 ARGUMENTS 🌸

• desc — a VMA descriptor that has already had an mmap_prepare hook executed on it. like, done, dusted, no takebacks ✨
• vma — the VMA that desc should be applied to. matching energies, fr fr 🦋

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💖 DESCRIPTION 💖

so this function is lowkey assuming a whole lot about you: it assumes you've already gotten yourself a VMA descriptor desc from compat_set_desc_from_vma, and that you've already executed the mmap_prepare hook on it. like, girl, do your homework first 😭

after that, it performs any specified mmap actions, and then it invokes the vm_ops->mapped hook if one is present. slay 🔥

for more details, go read the description of compat_vma_mmap — it's got the lore 👑

heads up bestie: once the conversion of drivers is complete, this function will no longer be required and will be removed. so don't get too attached, it's a limited-edition drop 💀

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⭐ RETURN ⭐

0 on success, or error. that's it, that's the whole mood 🎀

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🌈 SEE ALSO 🌈

kernel file ./mm/util.c, plus the whole friend group:

• kfree_const(9)
• __kmemdup_nul(9)
• kstrdup(9)
• kstrdup_const(9)
• kstrndup(9)
• kmemdup(9)
• kmemdup_array(9)
• kvmemdup(9)
• kmemdup_nul(9)
• memdup_user(9)
• vmemdup_user(9)
• strndup_user(9)
• memdup_user_nul(9)
• randomize_page(9)
• __account_locked_vm(9)
• account_locked_vm(9)
• __vmalloc_array(9)
• vmalloc_array(9)
• __vcalloc(9)
• vcalloc(9)
• folio_mapping(9)
• folio_copy(9)
• get_cmdline(9)
• mem_dump_obj(9)
• compat_set_desc_from_vma(9)
• compat_vma_mmap(9)
• snapshot_page(9)
• mmap_action_prepare(9)
• mmap_action_complete(9)
• folio_pte_batch(9)
• page_range_contiguous(9)

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and that's the whole page, bestie 🧚 coming at you straight from the ./mm directory, dated October 2026 — __compat_vma_mmap(9) out, mwah 💜💜💜