clear_user_highpages(9)

📦 version 7.3.1, in nixpkgs unstable

💅 clear_user_highpages — the section 9 girlies are gonna eat this UP

okay so bestie, welcome to clear_user_highpages(9) — it's a Kernel API Manual page, and honestly? she's a little icon. lowkey niche, highkey essential. let's get into it 🎀

✨ NAME ✨

clear_user_highpages — clear a page range to be mapped to user space

like, literally. you hand her a chunk of pages and she clears them so they're ready to get mapped on into user space. it's giving prep-work main character energy. 💅

🌸 SYNOPSIS 🌸

void clear_user_highpages (struct page *page , unsigned long vaddr ,
       unsigned int npages );

no cap, that's the whole signature. returns void — she doesn't have anything to say back to you, she just does the thing. periodt.

🦋 ARGUMENTS 🦋

  • page — start page. this is where the whole vibe begins, bestie 🌱
  • vaddr — start address of the user mapping. the user-space coordinates of the situation, iykyk 🗺️
  • npages — number of pages. how many we're clearing. the count. the quantity. the amount of clearing happening. ✨

💖 DESCRIPTION 💖

okay so here's the tea 🍵 — this function assumes that all the pages in the region (page, +npages) are valid, so it does no exception handling.

read that again. no exception handling. none. zero. she is trusting you completely 🙈 — so if you feed her invalid pages, that's on you, not her. she said "i'm not checking, i believe in you" and honestly? iconic but also be careful bestie 😭💀

🔥 SEE ALSO 🔥

she runs with a whole friend group, ngl — all living in the kernel file ./include/linux/highmem.h, and every single one of them is invited to the group chat:

the roster is LONG and every name is a baddie, no skips 💜

and that's the whole page, bestie 🫶 this cutie lives over in ./include/linux, brought to you by the Kernel API Manual, dated October 2026 — stay hydrated, clear your pages, and remember: no exception handling means she trusts you fr fr 💖✨🎀

📦 where this page comes from