STRUCT COUNTER_COMPONENT(9)

💖 NAME 💖

okay so welcome to the Kernel API Manual, bestie — this page is all about struct counter_component, aka the Counter component identification situation, and it's lowkey iconic 💅✨

✨ SYNOPSIS ✨

Here's the whole lil struct, no cap:

struct counter_component {
    __u8 type;
    __u8 scope;
    __u8 parent;
    __u8 id;
};

🎀 Members 🎀

• type — component type (one of enum counter_component_type) — literally the type field, keeping it classified 💖
• scope — component scope (one of enum counter_scope) — it's giving scope vibes 🌸
• parent — parent ID (matching the ID suffix of the respective parent sysfs path as described by the ABI documentation file Documentation/ABI/testing/sysfs-bus-counter) — so the parent match is documented right there, iykyk 🦋
• id — component ID (matching the ID provided by the respective *_component_id sysfs attribute of the desired component) — find that attribute, grab the value, slay ✨

🦋 Description 🦋

Okay so real talk: if the Count 2 ceiling extension of Counter device 4 is desired, set type equal to COUNTER_COMPONENT_EXTENSION, scope equal to COUNTER_SCOPE_COUNT, parent equal to 2, and id equal to the value provided by the respective /sys/bus/counter/devices/counter4/count2/ceiling_component_id sysfs attribute. That's the whole recipe, periodt 💅🔥

💜 SEE ALSO 💜

• Kernel file ./include/uapi/linux/counter.h — go peek, bestie 👀
• struct counter_watch(9)
• struct counter_event(9)

xoxo bestie, this page is from ./include/uapi/linux, dated October 2026 — that's the source/version + date sign-off, periodt 💖🫶