cpufreq_rem...te_util_hook(9)

💅 cpufreq_remove_update_util_hook(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for cpufreq_remove_update_util_hook, and yes the header up top abbreviates it as cpufreq_rem...te_util_hook(9) because apparently even kernel docs need a little drama with their ellipses. anyway. sit down, hydrate, let's go 🫶

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✨ NAME ✨

cpufreq_remove_update_util_hook — literally just clears the CPU's update_util_data pointer. that's it. that's the whole job. iconic minimalism 💅

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🌸 SYNOPSIS 🌸

void cpufreq_remove_update_util_hook (int cpu );

it returns void, so like… don't go looking for a return value, babe. there isn't one. it's giving "no thoughts, head empty, but make it C." 😌

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🎀 ARGUMENTS 🎀

• cpu — the CPU you want to clear the pointer for. that's the one. the chosen one. the CPU in question 👑

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🦋 DESCRIPTION 🦋

so what it does: it clears the update_util_data pointer for the given CPU. clear as a freshly wiped mirror, fr fr ✨

BUT — and this is the part where you pay attention, bestie, because this is not a drill 🚨 — callers must use RCU callbacks to free any memory that might be accessed via the old update_util_data pointer, or invoke synchronize_rcu right after this function. why? to avoid use-after-free. and use-after-free is that girl who ruins the whole party 💀 so like… do the RCU thing. please. for me. 🙏

ngl this is the kind of caveat that looks like a vibe and is actually load-bearing. do not skip it. the memory-safety girlies will come for you 😭

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🌈 SEE ALSO 🌈

• the kernel file ./kernel/sched/cpufreq.c
• cpufreq_add_update_util_hook(9) — the one that puts the hook in (you know, the opposite of this page 👯)
• cpufreq_this_cpu_can_update(9)

iykyk 💜

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and that's the page!! mwah 💋 this one lives under ./kernel/sched and the docs are stamped October 2026, so like… future-dated slay, we love to see it ⭐ 🎀 bye bestie, go clear those pointers responsibly 🧚‍♀️💖