folio_xor_flags_has_waiters(9)

💅 folio_xor_flags_has_waiters(9)

okay so bestie, we're in the Kernel API Manual today and this one's literally called folio_xor_flags_has_waiters — say that five times fast, i dare you 😭

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✨ NAME ✨

folio_xor_flags_has_waiters — flips some folio flags, and also tells you if anybody's waiting 🫶

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🦋 SYNOPSIS 🦋

bool folio_xor_flags_has_waiters (struct folio *folio , unsigned long mask );

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🎀 ARGUMENTS 🎀

• folio — the folio in question, the main character of this whole function 💖
• mask — every bit you set in this word is gonna get changed. that's the whole vibe 🔥

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🌸 DESCRIPTION 🌸

okay so hear me out, because this one has rules and you need to respect them, no cap:

• it must only be used for flags that get changed while the folio lock is held 🔒
• example of what NOT to do: PG_dirty, because that one can be set without the folio lock held, so using this on it is unsafe 💀
• it can also only be used on flags in the range 0-6, because some of the implementations only affect those bits. so like, stay in your lane, bestie ✨

fr fr do not ignore these constraints, they are not decorative 🚨

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⭐ RETURN ⭐

it returns whether there are tasks waiting on the folio 👀 — yes, the "has_waiters" part of the name was not a lie, iconic naming honestly 👑

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🌈 SEE ALSO 🌈

kernel file ./include/linux/page-flags.h, plus these little icons:

• page_folio(9)
• folio_page(9)
• folio_test_uptodate(9)
• folio_test_large(9)
• PageHuge(9)
• page_has_movable_ops(9)
• folio_has_private(9)

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and that's the whole page, bestie, you ate that 🍓

sign-off time: this gem lives over in ./include/linux, dated October 2026, and it's folio_xor_flags_has_waiters(9) — periodt 💜