cleanup_cpu_mmu_context(9)

💅 cleanup_cpu_mmu_context — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual entry for cleanup_cpu_mmu_context(9) and honestly? it's giving "short but iconic." let's get into it 🎀

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✨ NAME ✨

cleanup_cpu_mmu_context — Clean up MMU details for this CPU (newly offlined) 🧹💜

like, the CPU just got offlined and now we're doing the little goodbye cleanup ritual. so real of us.

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🌸 SYNOPSIS 🌸

void cleanup_cpu_mmu_context (void );

that's it. that's the whole call. no cap. ✨

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🦋 ARGUMENTS 🦋

• void — no arguments, bestie 💀 nothing to pass in, nothing to worry about. iconic lazy-girl signature.

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👑 DESCRIPTION 👑

okay so here's the vibe: this function clears the CPU from mm_cpumask for all processes 😭 — yes, all of them — and then it flushes the local TLB so that TLB coherency is ensured in case the CPU gets onlined again. 🫶 it's basically the "leave the group chat but keep the door open in case i come back" of CPUs.

🚨 but wait, important caveat incoming: KVM guest translations are not necessarily flushed here. if KVM ever started using mm_cpumask or the Linux APIs which do, this would have to be resolved. so like, keep that in mind. periodt. 💅

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🔥 SEE ALSO 🔥

• Kernel file ./arch/powerpc/mm/book3s64/mmu_context.c — go read it, iykyk 📖✨

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💖 a little sign-off 💖

this page lives under the source/version ./arch/powerpc/mm/book3s64, dated October 2026 — screenshot it, bookmark it, put it on your mood board 🌈⭐ and that's the whole manpage, you ate that 🍓🧚💜