folio_remove_rmap_ptes(9)

👑 folio_remove_rmap_ptes — a little guide from the Kernel API Manual 💅

okay so bestie, gather round, because this one is genuinely important and honestly kind of iconic. We're talking about folio_remove_rmap_ptes — the function that yeets PTE mappings off a page range of a folio. No cap, that's the whole personality. 🦋

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✨ SYNOPSIS ✨

void folio_remove_rmap_ptes (struct folio *folio , struct page *page ,
       int nr_pages , struct vm_area_struct *vma );

look at her. four args, returns nothing (void — she gives, she doesn't take 💅). Copy it exactly if you're typing it out, mkay?

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🎀 ARGUMENTS 🎀

• folio — the folio you're removing the mappings from. main character energy, fr.
• page — the first page to remove. like, the starting point of the whole situation.
• nr_pages — how many pages get removed from the mapping. the count. the vibes. the number.
• vma — the vm area the mappings are being removed from. lowkey essential.

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🌸 DESCRIPTION 🌸

so the page range of the folio is defined by [page, page + nr_pages) — yes, half-open interval, the brackets are doing the Lord's work, note the ) at the end, not a ]. ✨

⚠️ big one: the caller needs to hold the page table lock. Not optional. Not a suggestion. Hold the lock or perish (metaphorically, but like… don't test it 😭).

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🦋 SEE ALSO 🦋

the whole friend group, in the order the page says, because I respect the source material:

• Kernel file ./mm/rmap.c
• __anon_vma_prepare(9)
• anon_vma_clone(9)
• unlink_anon_vmas(9)
• page_address_in_vma(9)
• folio_referenced(9)
• mapping_wrprotect_range(9)
• pfn_mkclean_range(9)
• folio_move_anon_rmap(9)
• __folio_set_anon(9)
• __page_check_anon_rmap(9)
• folio_add_anon_rmap_ptes(9)
• folio_add_anon_rmap_pmd(9)
• folio_add_new_anon_rmap(9)
• folio_add_file_rmap_ptes(9)
• folio_add_file_rmap_pmd(9)
• folio_add_file_rmap_pud(9)
• folio_remove_rmap_pmd(9)
• folio_remove_rmap_pud(9)
• try_to_unmap(9)
• try_to_migrate(9)
• make_device_exclusive(9)
• __rmap_walk_file(9)

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💖 sign-off 💖

and that's the whole page, bestie! 🫶 she lives in ./mm, she's stamped October 2026, and that's the Kernel API Manual tea for today. go hold that page table lock. slay. periodt. 💅✨🎀