cpufreq_update_policy(9)

💅 cpufreq_update_policy — Kernel API Manual ✨

okay so bestie, welcome to cpufreq_update_policy(9), straight outta the Kernel API Manual. this one's a little function with main character energy — she doesn't create policies, she just rolls up and re-evaluates the one you already got. iconique. 🎀

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✨ NAME ✨

cpufreq_update_policy — Re-evaluate an existing cpufreq policy. no cap, that's literally her whole job. 🦋

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🌸 SYNOPSIS 🌸

void cpufreq_update_policy (unsigned int cpu );

yep, that's the whole signature. void return, one unsigned int argument, in and out, periodt. 💅

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🎀 ARGUMENTS 🎀

• cpu — the CPU whose policy you want to re-evaluate. that's it. that's the whole argument. she just needs to know which CPU we're talking about and she handles the rest 🫶

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💖 DESCRIPTION 💖

okay so here's the tea ☕ — cpufreq_update_policy updates the current frequency for the cpufreq policy of cpu, and then it uses cpufreq_set_policy to re-apply the min and max limits. 🔥

and the way that cpufreq_set_policy re-applies those limits? that's what kicks off the whole cascade, bestie:

• it triggers the evaluation of policy notifiers, and
• it triggers the cpufreq driver's ->verify callback for the policy in question,

among other things. so yeah, one call, lots of downstream vibes. she's giving "small function, big ripple effect" 🌈✨

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🦋 SEE ALSO 🦋

all her friends!! the whole cpufreq friend group, plus the kernel file they all live in 💜

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_limits(9)
• cpufreq_register_driver(9)

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ok that's the whole page!! go re-evaluate some policies, bestie, you got this 💪✨

this lil gem lives in ./drivers/cpufreq, and the page itself is dated October 2026 — so yeah, she's from the future, she's fresh, she's iconic 👑💀 see you in the next manpage, mwah 🍓🧚