free_mem_extents(9)

💖 free_mem_extents(9) — a kernel API manual moment 💖

okay so bestie, welcome to the section 9 girlies — this is kernel API manual territory, where we talk about functions the kernel calls on itself, not the stuff you type into a shell. and today's main character is free_mem_extents, which is exactly what it says on the tin: it frees a list of memory extents. that's it. that's the whole vibe. 🎀

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✨ NAME ✨

free_mem_extents — free a list of memory extents, no cap 💅

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🌸 SYNOPSIS 🌸

void free_mem_extents (struct list_head *list );

literally that's the whole signature. void — she returns nothing, she's done when she's done, periodt. 🫶

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🦋 ARGUMENTS 🦋

• list — the list of extents to free. that's the list. the extents in it? they get freed. iconic behaviour, honestly.

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👑 SEE ALSO 👑

okay this is the part where the manpage just goes full group-chat roster and tags everyone in the kernel file ./kernel/power/snapshot.c. not me listing all 26 of them, but here we are, and honestly every single one ate:

• get_image_page(9)
• free_image_page(9)
• alloc_rtree_node(9)
• create_mem_extents(9)
• memory_bm_next_pfn(9)
• mark_nosave_pages(9)
• create_basic_memory_bitmaps(9)
• free_basic_memory_bitmaps(9)
• snapshot_additional_pages(9)
• count_free_highmem_pages(9)
• count_highmem_pages(9)
• count_data_pages(9)
• swsusp_free(9)
• preallocate_image_pages(9)
• free_unnecessary_pages(9)
• minimum_image_size(9)
• hibernate_preallocate_memory(9)
• pack_pfns(9)
• snapshot_read_next(9)
• unpack_orig_pfns(9)
• count_highmem_image_pages(9)
• prepare_highmem_image(9)
• copy_last_highmem_page(9)
• prepare_image(9)
• snapshot_write_next(9)
• restore_highmem(9)

like… the whole hibernation/snapshot friend group showed up to the function. iykyk 💜

and yeah, they're all in ./kernel/power/snapshot.c — go say hi, they don't bite 🧚

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and that's the page, bestie! 🌈 this lil kernel API manual entry lives in ./kernel/power and it's dated October 2026 — so when you're reading it, know that future-you said hi. slay, bye! 💖✨🍓