undo_isolate_page_range(9)

💅 undo_isolate_page_range(9) — bestie's guide to un-isolating 💅

okay so real talk, the manual name is undo_isolate_page_range(9) and it lives in the Kernel API Manual — which, iconic. it's the cleanup crew of the page isolation world, and honestly? we love a function that knows its job is to put things back. 🫶

---

✨ NAME ✨

undo_isolate_page_range — literally just undoes the effects of start_isolate_page_range(). that's it. that's the whole vibe. no cap. 💖

---

🌸 SYNOPSIS 🌸

void undo_isolate_page_range (unsigned long start_pfn , unsigned long
       end_pfn );

yes bestie, it returns void — it gives nothing back except peace of mind and a fully un-isolated range. 🎀

---

🦋 ARGUMENTS 🦋

• start_pfn — the first PFN of the isolated range. like, where the whole thing kicks off. the opening act. 🌟
• end_pfn — the last PFN of the isolated range. the grand finale. the closing credits. 🎬

both of these are unsigned long, and both are PFNs, not addresses, not vibes — keep them straight, iykyk. 💀

---

🔥 DESCRIPTION 🔥

this function finds and unsets every MIGRATE_ISOLATE page block in the given range. that's the whole story, and it ate. 👑

the way that it just sweeps through the range from start_pfn to end_pfn and flips every single MIGRATE_ISOLATE page block back to... not that. main character energy fr fr. the range goes in, the isolation comes out, and everything is slaying in its wake. ✨

---

🌈 SEE ALSO 🌈

• Kernel file ./mm/page_isolation.c — the source file, the origin story, the mothership 🧚
• isolate_single_pageblock(9) — the one that does a single block, the solo act 🎤
• start_isolate_page_range(9) — the one that this function exists to undo, the prequel 💜
• test_pages_isolated(9) — the vibe check for whether pages are isolated 🕵️

---

and that's the whole page, bestie — go forth and un-isolate responsibly 🎀✨

this one came from ./mm, dated October 2026, and it's part of the Kernel API Manual — same manual as the big undo_isolate_page_range(9) title up top, so you already know 💅 mwah, see u in the group chat 🫶