pte_is_uffd_wp_marker(9)

💅 pte_is_uffd_wp_marker(9) 💅

okay bestie, so this is a page from the Kernel API Manual and it's about one tiny little function that answers one tiny little question 🎀

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✨ NAME ✨

pte_is_uffd_wp_marker — the vibe check for a PTE entry: does this thing encode a userfaultfd write protect marker leaf entry? 🦋

like, is this PTE lowkey a UFFD WP marker leaf entry or not. that's the whole gig. no cap.

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🌸 SYNOPSIS 🌸

bool pte_is_uffd_wp_marker (pte_t pte );

it takes a pte_t and hands you back a bool. that's it. iconic minimalism honestly 🫶

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💖 ARGUMENTS 💖

• pte — a PTE entry. that's the whole argument. one (1) PTE entry, freshly handed to you, and you're asking it the Big Question 😌

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⭐ RETURN ⭐

it returns true if this PTE is a UFFD WP marker leaf entry, otherwise false. simple as that, periodt ✨

ngl this is the easiest return value in the whole file. two states. no in-between. no "undefined". we love a binary king 👑

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🦋 SEE ALSO 🦋

sooooo this is the part where the manpage just. goes off. like it's giving "I know everybody at this party" energy 💀 the kernel file is ./include/linux/leafops.h and here's the whole friend group:

• softleaf_mk_none(9)
• softleaf_from_pte(9)
• softleaf_to_pte(9)
• softleaf_from_pmd(9)
• softleaf_to_pmd(9)
• softleaf_is_none(9)
• softleaf_type(9)
• softleaf_is_swap(9)
• softleaf_is_migration_write(9)
• softleaf_is_migration_read(9)
• softleaf_is_migration_read_exclusive(9)
• softleaf_is_migration(9)
• softleaf_is_device_private_write(9)
• softleaf_is_device_private(9)
• softleaf_is_device_exclusive(9)
• softleaf_is_hwpoison(9)
• softleaf_is_marker(9)
• softleaf_to_marker(9)
• softleaf_has_pfn(9)
• softleaf_to_pfn(9)
• softleaf_to_page(9)
• softleaf_to_folio(9)
• softleaf_is_poison_marker(9)
• softleaf_is_guard_marker(9)
• softleaf_is_uffd_wp_marker(9)
• softleaf_is_migration_young(9)
• softleaf_is_migration_dirty(9)
• pte_is_marker(9)
• pte_is_uffd_marker(9)
• pmd_is_device_private_entry(9)
• pmd_is_migration_entry(9)
• softleaf_is_valid_pmd_entry(9)
• pmd_is_valid_softleaf(9)
• pmd_to_softleaf_folio(9)

like. that's a whole friend group chat and our girl pte_is_uffd_wp_marker is right there in the middle of it 💜 iykyk

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and that's the whole page bestie!! 🌈 this one lives in ./include/linux and the version/date stamp on it is October 2026 — so yeah, it's a little time traveler. write that down. 💅✨🎀