clear_full_ptes(9)

💅 clear_full_ptes(9) — the Kernel API Manual page you actually wanna read 🎀

okay bestie, welcome to the <pink>kernel API manual</pink>, this one's about clear_full_ptes and honestly it's giving "small function, big responsibilities" energy ✨

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🌸 NAME 🌸

clear_full_ptes — clears the present PTEs that map consecutive pages of the same folio 💖 like, bye-bye mappings, but make it orderly.

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✨ SYNOPSIS ✨

void clear_full_ptes (struct mm_struct *mm , unsigned long addr , pte_t
*ptep , unsigned int nr , int full );

no cap, that's the whole signature, copy it exactly bestie 🫶

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🦋 ARGUMENTS 🦋

• mm — the address space these pages are mapped into. it's the whole vibe container ngl 💜
• addr — the address where the first page is mapped. first entry, main character energy 👑
• ptep — page table pointer for that first entry. your starting point, periodt 📍
• nr — how many entries we're clearing. yes, it's a plural situation 🍓
• full — whether we're clearing a full mm. like, the whole entire mm 🙈

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💀 DESCRIPTION 💀

so the tea is: this function may be overridden by the architecture 👀 — if your arch has opinions, it gets to do its own thing. otherwise it's implemented as a simple loop over ptep_get_and_clear_full. simple loop, iconic behaviour, that's the whole deal ✨

and lowkey important: the PTE bits in the PTE range besides the PFN can differ. for example, some PTEs might be write-protected. so don't go assuming they're all identical twins, because they are NOT 😭

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🌈 CONTEXT 🌈

a few things that are straight up required, not optional, fr fr:

• The caller holds the page table lock 🔒 (yes, the page table lock, don't even think about skipping it)
• The PTEs map consecutive pages that belong to the same folio 🧚
• The PTEs are all in the same PMD ⭐

bestie if any of those three aren't true, that's not a vibe check you wanna fail 💀

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🎀 SEE ALSO 🎀

the whole friend group, in order, no one left out 🫶

• Kernel file ./include/linux/pgtable.h
• 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_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)
• pfnmap_untrack(9)
• pfnmap_setup_cachemode_pfn(9)

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and that's the page bestie!! 💅 this lil beauty lives in ./include/linux and the version we're looking at is dated October 2026 — screenshot it, cite it, love it, iykyk 🌸🦋💖