pmd_is_device_private_entry(9)

💅 pmd_is_device_private_entry 💅

okay so this is a page from the Kernel API Manual (section 9, bestie, we're in the deep kernel lore now) and it's about pmd_is_device_private_entry — yes that's a whole mouthful, but it's literally just a yes/no question wrapped in a function, and honestly? iconic.

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✨ NAME ✨

pmd_is_device_private_entry — check if a PMD contains a device private swap entry 🫶

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🌸 SYNOPSIS 🌸

bool pmd_is_device_private_entry (pmd_t pmd );

like, you hand it a PMD and it hands you back a bool. no cap, that's the whole deal. ✨

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🎀 ARGUMENTS 🎀

• pmd — the PMD you want to check. that's it. that's the argument. give it the PMD and let it cook. 💅

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — this function returns true if the PMD contains a swap entry that represents a device private page mapping.

it's for zone device private pages that have been swapped out but still need special handling during various memory management operations. like yes they got swapped out, but they're not done being main characters yet, y'know? 👑

so whenever memory management is doing its rounds and needs to know "hey is this PMD holding one of those device private swap entries?", this is the function that answers. lowkey important. highkey slay. 💖

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⭐ RETURN ⭐

true if the PMD contains a device private entry, false otherwise. binary. decisive. no maybes. periodt. 💀

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🌈 SEE ALSO 🌈

bestie there are so many friends in this family, let me introduce you:

• Kernel file ./include/linux/leafops.h
• 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_wp_marker(9)
• pte_is_uffd_marker(9)
• pmd_is_migration_entry(9)
• softleaf_is_valid_pmd_entry(9)
• pmd_is_valid_softleaf(9)
• pmd_to_softleaf_folio(9)

like a whole group chat of softleaf besties 🧚💜

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and that's the whole page, bestie!! 🎀 source lives at ./include/linux, dated October 2026, and it's page pmd_is_device_private_entry(9) of the Kernel API Manual — mwah, go read your PMDs responsibly 💋✨🦋