swap_dup_entries_cluster(9)

swap_dup_entries_cluster(9) 💅✨

okay so bestie, welcome to the Kernel API Manual corner of the group chat 🫶 today’s main character is swap_dup_entries_cluster(9) — and yes, it’s giving “increase the swap count of slots within one cluster” energy, literally exactly that. no cap. 💖

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🌸 NAME 🌸

swap_dup_entries_cluster — Increase the swap count of slots within one cluster.

✨ SYNOPSIS ✨

int swap_dup_entries_cluster (struct swap_info_struct *si , pgoff_t offset , int nr );

that’s the signature, character for character, so copy it exactly and don’t come for me 🙈✨

🎀 ARGUMENTS 🎀

• si — The swap device. the actual swap device in question, okay?
• offset — start offset of slots.
• nr — number of slots.

🦋 CONTEXT 🦋

vibe check: the specified slots must be pinned by an existing swap count or a swap cache reference, so they won’t be released until this helper returns. like, they are held in place for the whole ride, fr fr 🫶

🔥 RETURN 🔥

• 0 — on success. slay.
• -ENOMEM — if the swap count maxed out (SWP_TB_COUNT_MAX) and failed to allocate an extended table.
• -EINVAL — if any entry is bad entry.

🌈 SEE ALSO 🌈

Kernel file ./mm/swapfile.c and the whole crew:

• swap_put_entries_cluster(9)
• folio_alloc_swap(9)
• folio_dup_swap(9)
• folio_put_swap(9)
• swap_entry_swapped(9)
• folio_free_swap(9)
• swap_put_entries_direct(9)
• swap_alloc_hibernation_slot(9)
• swap_free_hibernation_slot(9)
• pin_hibernation_swap_type(9)
• unpin_hibernation_swap_type(9)
• find_hibernation_swap_type(9)

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okay that’s the whole page, bestie!! big kiss from the ./mm source/version, dated October 2026 — mwah 💖🎀🫶