kho_preserve_folio(9)

💖 kho_preserve_folio(9) 💖

okay so bestie, welcome to the Kernel API Manual — this is the kho_preserve_folio page and it's literally about saving a folio across kexec, no cap ✨

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🌸 NAME 🌸

kho_preserve_folio — preserve a folio across kexec 💅

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🦋 SYNOPSIS 🦋

int kho_preserve_folio (struct folio *folio );

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🎀 ARGUMENTS 🎀

• folio — the folio you want to preserve. that's the whole vibe bestie 🫶

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✨ DESCRIPTION ✨

so what it does: it instructs KHO to preserve the whole folio across kexec. the whole thing. not a little piece. the whole folio, periodt 💀

and the order gets preserved as well — yes bestie, the order stays, it's not out here losing information 👑

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🔥 RETURN 🔥

• 0 on success 🎉
• an error code on failure 😭

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🧚 SEE ALSO 🧚

Kernel file ./kernel/liveupdate/kexec_handover.c — that's where the magic lives 💜

• kho_encode_radix_key(9)
• kho_decode_radix_key(9)
• kho_radix_add_key(9)
• kho_radix_del_key(9)
• kho_radix_init_tree(9)
• kho_radix_destroy_tree(9)
• kho_radix_walk_tree(9)
• kho_restore_folio(9)
• kho_restore_pages(9)
• kho_reserve_scratch(9)
• kho_add_subtree(9)
• kho_unpreserve_folio(9)
• kho_preserve_pages(9)
• kho_unpreserve_pages(9)
• kho_preserve_vmalloc(9)
• kho_unpreserve_vmalloc(9)
• kho_restore_vmalloc(9)
• kho_alloc_preserve(9)
• kho_unpreserve_free(9)
• kho_restore_free(9)
• is_kho_boot(9)
• kho_retrieve_subtree(9)

like, the whole friend group is there, go say hi 🫶

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and that's the page bestie!! this little icon came from ./kernel/liveupdate and it's dated October 2026 — slay, go preserve some folios responsibly 💅🎀💖