pfnmap_untrack(9)

💅 pfnmap_untrack — kernel API manual, but make it make sense

Okay bestie, welcome to pfnmap_untrack(9), the little kernel function that's giving "cleanup crew" energy. ✨ It's the counterpart to tracking a pfn range — you tracked it, now let's untrack it. Iconic.

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🌸 NAME 🌸

pfnmap_untrack — untrack a pfn range 🎀

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✨ SYNOPSIS ✨

void pfnmap_untrack (unsigned long pfn , unsigned long size );

That's it. Two args, no return value. Lowkey the most chill signature ever. 🦋

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🫶 ARGUMENTS 🫶

• pfn — the start of the pfn range. This is where the party starts, fr fr. 📍
• size — the size of the pfn range in bytes. Read that again: bytes, not pfns, not pages. Bytes. Don't get it twisted. 😭

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💖 DESCRIPTION 💖

Untrack a pfn range previously tracked through pfnmap_track. That's the whole vibe — it's the undo button for tracking, no cap. You tracked it before, so now you untrack it. Periodt. 💅

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👑 SEE ALSO 👑

Kernel file ./include/linux/pgtable.h — and honestly the whole friend group is here, so let's list them all because every single one of them ate:

• lazy_mmu_mode_enable(9)
• lazy_mmu_mode_disable(9)
• __task_lazy_mmu_mode_pause(9)
• lazy_mmu_mode_pause(9)
• __task_lazy_mmu_mode_resume(9)
• lazy_mmu_mode_resume(9)
• pte_batch_hint(9)
• set_ptes(9)
• clear_young_dirty_ptes(9)
• get_and_clear_full_ptes(9)
• get_and_clear_ptes(9)
• clear_full_ptes(9)
• clear_ptes(9)
• clear_nonpresent_ptes(9)
• ptep_try_set(9)
• flush_tlb_before_set(9)
• wrprotect_ptes(9)
• clear_flush_young_ptes(9)
• test_and_clear_young_ptes(9)
• modify_prot_start_ptes(9)
• modify_prot_commit_ptes(9)
• pfnmap_setup_cachemode(9)
• pfnmap_track(9) ← the other half of this situationship 💜
• pfnmap_setup_cachemode_pfn(9)

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This page lives in ./include/linux and it's dated October 2026 — that's the source, the version, and the date all wrapped up with a bow. 🎀 Go untrack those ranges, bestie, you got this. 💖🌈⭐