MEMFD LIVE UPDATE ABI(9)

💖 memfd Live Update ABI(9) 💖

okay so bestie, this is the Kernel API Manual page for memfd Live Update ABI(9), and it’s literally about how memfd keeps its state alive across a reboot. No cap. 🫶

memfd uses the ABI defined below for preserving its state across a kexec reboot using the LUO. The state is serialized into a packed structure struct memfd_luo_ser, which is handed over to the next kernel via the KHO mechanism. iconic handoff behavior, honestly. ✨

🚨 contract alert: this interface is a contract. Any modification to the structure layout constitutes a breaking change. Such changes require incrementing the version number in the MEMFD_LUO_FH_COMPATIBLE string. periodt. 💅

👀 SEE ALSO 👀

• Kernel file ./include/linux/kho/abi/memfd.h
• MEMFD_LUO_FOLIO_DIRTY(9)
• MEMFD_LUO_FOLIO_UPTODATE(9)
• struct memfd_luo_folio_ser(9)
• struct memfd_luo_ser(9)

mwah 💋 — source/version line: ./include/linux/kho/abi; date: October 2026; title: memfd Live Update ABI(9) 🫶✨