pcpu_free_pages(9)

okay so bestie, this is the pcpu_free_pages(9) page from the Kernel API Manual 💅✨ no cap, it’s giving kernel-internals realness.

🌸 NAME 🌸

pcpu_free_pages — free pages which were allocated for @chunk 🫶

✨ SYNOPSIS ✨

void pcpu_free_pages (struct pcpu_chunk *chunk , struct page **pages ,
       int page_start , int page_end );

🎀 ARGUMENTS 🎀

okay so here’s the cast of characters, and yes they all matter:

• chunk — the chunk that those pages were allocated for, periodt.
• pages — the array of pages to be freed, indexed by pcpu_page_idx 💅
• page_start — page index of the first page to be freed ✨
• page_end — page index of the last page to be freed + 1 🫶

🦋 DESCRIPTION 🦋

literally what it says on the tin: it frees the pages in the range [page_start and page_end) inside pages, for all units. The pages were allocated for chunk. That’s the whole vibe check 💖

👑 SEE ALSO 👑

The kernel file is ./mm/percpu-vm.c, and the besties it points you at are:

• pcpu_get_pages(9)
• pcpu_alloc_pages(9)
• pcpu_pre_unmap_flush(9)
• pcpu_unmap_pages(9)
• pcpu_post_unmap_tlb_flush(9)
• pcpu_map_pages(9)
• pcpu_post_map_flush(9)
• pcpu_populate_chunk(9)
• pcpu_depopulate_chunk(9)
• pcpu_should_reclaim_chunk(9)

mwah 💋 — source/version: ./mm, date: October 2026 — okay bye bestie, stay iconic 🫶🎀