kho_preserve_pages(9)

💅 kho_preserve_pages(9) — like, the Kernel API Manual entry you actually wanna read 🎀

okay so bestie, welcome to the Kernel API Manual page for kho_preserve_pages. this one's short and sweet and honestly kinda iconic for it ✨

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🌸 NAME 🌸

kho_preserve_pages — preserve contiguous pages across kexec 🦋

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✨ SYNOPSIS ✨

int kho_preserve_pages (struct page *page , unsigned long nr_pages );

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💜 ARGUMENTS 💜

• page — the first page in the list. yeah, the first one, she's the main character here 👑
• nr_pages — how many pages. the count. the vibe check number 🌈

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🔥 DESCRIPTION 🔥

so what she does: she preserves a contiguous list of order 0 pages 💅 like, a whole lil lineup of them, all order 0, all together.

⚠️ listen up though — you must restore them using kho_restore_pages to make sure the pages actually come back properly as order 0. no shortcuts, no cap 🙈

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⭐ RETURN ⭐

0 on success, error code on failure. that's it, that's the whole personality 😭

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🫶 SEE ALSO 🫶

the kernel file in question, aka where the magic lives:

./kernel/liveupdate/kexec_handover.c

and the whole friend group 💖:

• 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_preserve_folio(9)
• kho_unpreserve_folio(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)

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mwah 💋 that's the page! brought to you from ./kernel/liveupdate, dated October 2026 — go read the others too, iykyk 🌟