STRUCT CLK_NOTIFIER_DATA(9)

📦 version 7.3.1, in nixpkgs unstable

💅 STRUCT CLK_NOTIFIER_DATA(9) 💅

okay so real talk, this is from the Kernel API Manual and it's literally the little data bundle that gets handed to your clock notifier callback 🎀 like, it's the envelope your rate-change news arrives in, and honestly? iconic.

✨ NAME ✨

struct clk_notifier_data — the rate data you pass along to the notifier callback. that's it, that's the whole vibe 🫶

🌸 SYNOPSIS 🌸

struct clk_notifier_data {
    struct clk              *clk;
    unsigned long           old_rate;
    unsigned long           new_rate;
 };

look at her. three fields. flawless. no notes 💅

🦋 Members 🦋

  • clk — a struct clk *, aka the clock that's being changed. the main character of this whole situation 👑
  • old_rate — the previous rate of this clk. the "before" pic 📸
  • new_rate — the new rate of this clk. the glow-up ✨

💖 Description 💖

okay so here's the tea, and it depends on which kind of notifier you're running ☕

For a pre-notifier: old_rate is the clk's rate before this rate change, and new_rate is what the rate will be in the future. so you're getting the prophecy before it happens 🔮

For a post-notifier: old_rate and new_rate are both set to the clk's current rate. and before you come for her — this was done to optimize the implementation. she's efficient, not lazy, periodt 💀

🌈 SEE ALSO 🌈

Kernel file ./include/linux/clk.h — and like, the entire extended clk cinematic universe, fr fr:

and that's the whole page bestie, go touch some struct clk 🧚💜

sign-off szn: this lil masterpiece lives in ./include/linux, dated October 2026, and answers to the name struct clk_notifier_data(9) — slay, mwah 💋🌸

📦 where this page comes from