copy_last_highmem_page(9)

💖 copy_last_highmem_page(9) 💖

okay so first of all, welcome to the Kernel API Manual bestie, this is the copy_last_highmem_page(9) page and it is exactly what it sounds like 🫶

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✨ NAME ✨

copy_last_highmem_page — copies the most recent highmem image page. that's it. that's the whole job. no cap 💅

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✨ SYNOPSIS ✨

void copy_last_highmem_page (void );

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✨ ARGUMENTS ✨

• void — literally no arguments. zero. none. she takes nothing and she gives… well, she gives a copy. 🎀

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✨ DESCRIPTION ✨

so here's the vibe 🌸: this function copies the contents of a highmem image from buffer — that's where the caller of snapshot_write_next stashed them — over to the right location, the one represented by last_highmem_page .

that's the whole plot. buffer in, last_highmem_page out. iconic, minimal, no notes 👑

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✨ SEE ALSO ✨

the whole friend group, fr fr 💜 — all of these live in the kernel file ./kernel/power/snapshot.c:

• get_image_page(9)
• free_image_page(9)
• alloc_rtree_node(9)
• free_mem_extents(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)
• prepare_image(9)
• snapshot_write_next(9)
• restore_highmem(9)

go read them all i'm literally begging 🙈

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lowkey reminder: buffer and last_highmem_page are doing the heavy lifting here — if you're calling this, make sure the caller of snapshot_write_next actually put something in buffer first, bestie 😭

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🌸 that's the page!! brought to you by ./kernel/power, October 2026, and the Kernel API Manual — slay safe out there, mwah 💋✨