cpufreq_update_limits(9)

🎀 cpufreq_update_limits(9) — Kernel API Manual 💅

okay so bestie, welcome to the Kernel API Manual page for cpufreq_update_limits(9) — it is literally about updating policy limits for one CPU. no cap. 💖

✨ NAME ✨

cpufreq_update_limits — Update policy limits for a given CPU.

🦋 SYNOPSIS 🦋

void cpufreq_update_limits (unsigned int cpu );

🧠 ARGUMENTS 🧠

• cpu — CPU to update the policy limits for. that’s the whole vibe check: you hand it a CPU, and it handles that CPU’s policy limits. 👑

🔥 DESCRIPTION 🔥

okay so here’s the tea: cpufreq_update_limits() invokes the driver’s ->update_limits callback if present. If that callback isn’t present, it calls cpufreq_policy_refresh for cpu. the way that it just does exactly one of those two things is honestly iconic. ✨

💡 callback if it’s there; otherwise cpufreq_policy_refresh for cpu. that’s it, bestie. 🫶

🌈 SEE ALSO 🌈

Kernel file ./drivers/cpufreq/cpufreq.c

• cpufreq_cpu_get(9)
• cpufreq_cpu_put(9)
• adjust_jiffies(9)
• cpufreq_notify_transition(9)
• cpufreq_enable_fast_switch(9)
• cpufreq_disable_fast_switch(9)
• cpufreq_driver_resolve_freq(9)
• cpufreq_parse_governor(9)
• cpufreq_add_dev(9)
• cpufreq_out_of_sync(9)
• cpufreq_quick_get(9)
• cpufreq_quick_get_max(9)
• cpufreq_get_hw_max_freq(9)
• cpufreq_get(9)
• cpufreq_suspend(9)
• cpufreq_resume(9)
• cpufreq_driver_test_flags(9)
• cpufreq_get_current_driver(9)
• cpufreq_get_driver_data(9)
• cpufreq_register_notifier(9)
• cpufreq_unregister_notifier(9)
• cpufreq_driver_fast_switch(9)
• cpufreq_driver_adjust_perf(9)
• cpufreq_driver_has_adjust_perf(9)
• cpufreq_update_pressure(9)
• cpufreq_set_policy(9)
• cpufreq_update_policy(9)
• cpufreq_register_driver(9)

💖 source/version: ./drivers/cpufreq · date: October 2026 · from the Kernel API Manual, bestie. periodt. 💅