softleaf_to_folio(9)

✨ softleaf_to_folio — kernel API manual, section 9 bestie ✨

okay so we're doing softleaf_to_folio(9) today and honestly? it's giving "small function, big responsibility" 💅 this one lives in the Kernel API Manual and it's here to hand you a struct folio when all you've got is a leaf entry. iconic behavior fr fr.

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🌸 NAME 🌸

softleaf_to_folio — obtains the struct folio for the PFN that's encoded up inside a leaf entry 🍓

like. the leaf entry is being sneaky and hiding a PFN in there, and this function goes "no babe, we're getting her out" and hands you the folio. obsessed.

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🎀 SYNOPSIS 🎀

struct folio * softleaf_to_folio (softleaf_t entry );

that's it. one argument. one pointer back. we love a low-effort queen ✨

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💖 ARGUMENTS 💖

• entry — the leaf entry itself, and listen: softleaf_has_pfn(entry) must return true. that's not a vibe suggestion, that's a requirement, no cap. if you roll up with an entry that doesn't have a PFN, that's on you 🫶

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🌈 RETURN 🌈

a pointer to the struct folio that's associated with the leaf entry's PFN 💫 that's the whole deal, that's the tea.

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🦋 SEE ALSO 🦋

the kernel file ./include/linux/leafops.h is the home base for all of this, and it's literally a whole friend group of functions. go say hi to all of them:

• 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_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_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)

that's the whole squad, iykyk 💜

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k bye bestie, this page came from ./include/linux and it's dated October 2026, and the manual page is literally called softleaf_to_folio(9) in case you forgot already 😭 mwah, go read your folios 💋✨