tmigr_cpu_deactivate(9)

💖 NAME 💖

tmigr_cpu_deactivate — puts the current CPU into inactive state, bestie. This page is from the Kernel API Manual, and it’s giving “small function, very specific job” energy 💅.

✨ SYNOPSIS ✨

u64 tmigr_cpu_deactivate (u64 nextexp );

🎀 ARGUMENTS 🎀

• nextexp — the next global timer expiry of the current CPU. That’s the value you’re passing in, okay? 🎀

🌸 DESCRIPTION 🌸

Okay so real talk: this function must be called with interrupts disabled. Not “try your best,” not “if you feel like it” — interrupts disabled, periodt. ⚠️

🦋 RETURN 🦋

The return value is the next event expiry of the current CPU. But wait, there’s a plot twist 🫢: if this CPU is the top level migrator, or if the hierarchy is completely idle, then you get the next event expiry from the hierarchy instead. That’s it, that’s the return vibe ✨.

🌈 SEE ALSO 🌈

Peep the kernel file ./kernel/time/timer_migration.c and these iconic friends 👑:

• struct tmigr_walk(9)
• tmigr_cpu_activate(9)
• tmigr_handle_remote(9)
• tmigr_requires_handle_remote(9)
• tmigr_cpu_new_timer(9)
• tmigr_quick_check(9)
• tmigr_isolated_exclude_cpumask(9)

Byeeee from the ./kernel/time source corner, dated October 2026, on the tmigr_cpu_deactivate(9) page — slay and stay interrupt-safe 💖🦋🫶