folio_has_private(9)

✨ folio_has_private ✨

okay so bestie, we're diving into the Kernel API Manual today and the star of the show is folio_has_private(9) — literally the vibe check for folios 💅

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🌸 NAME 🌸

folio_has_private — determine if a folio has private stuff 🎀

no cap, that's the whole pitch. it checks whether a folio is carrying around some private stuff of its own.

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🦋 SYNOPSIS 🦋

int folio_has_private (const struct folio *folio );

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💖 ARGUMENTS 💖

• folio — the folio we're checking, aka the main character of this function 🫶

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⭐ DESCRIPTION ⭐

so here's the tea: this function determines if a folio has private stuff, which is basically the signal that release routines should be invoked upon it. that's it, that's the whole job — it's giving "am I free to let go?" energy 😭

lowkey important detail: the whole point of the check is that if it comes back positive, those release routines gotta run. don't skip them, bestie 💀

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/page-flags.h
• page_folio(9)
• folio_page(9)
• folio_xor_flags_has_waiters(9)
• folio_test_uptodate(9)
• folio_test_large(9)
• PageHuge(9)
• page_has_movable_ops(9)

like, go read all of these too, iykyk 🌈

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🧚 sign-off 🧚

this lil page lives in ./include/linux and it's tagged October 2026 — so yeah, that's the source and the date, go off 👑

slay, you now understand folio privacy. periodt. 💜