unpoison_memory(9)

💖 NAME 💖

okay so welcome to the unpoison_memory(9) page in the Kernel API Manual, bestie ✨ This one is all about unpoison_memory — Unpoison a previously poisoned page 🎀

✨ SYNOPSIS ✨

int unpoison_memory (unsigned long pfn );

🦋 ARGUMENTS 🦋

• pfn — Page number of the to be unpoisoned page. Like, which page are we un-poisoning? This is literally the page number, bestie 🫶

🔥 DESCRIPTION 🔥

Okay so unpoison_memory software-unpoisons a page that has been poisoned by memory_failure earlier. It’s giving cleanup era ✨

This is only done on the software-level, so it only works for linux injected failures, not real hardware failures. Huge caveat, no cap: it will not fix actual hardware drama 😭

Returns 0 for success, otherwise -errno. Slay when it’s 0, and check that errno when it’s not 💀

🌈 SEE ALSO 🌈

• Kernel file ./mm/memory-failure.c
• MF_ATTR_RO(9)
• get_hwpoison_page(9)
• mf_dax_kill_procs(9)
• memory_failure_pfn(9)
• memory_failure(9)
• memory_failure_queue(9)
• soft_offline_page(9)

source/version: ./mm • date: October 2026 • page: unpoison_memory(9) — byeee, go unpoison responsibly 💜