ENUM CMB_FORMAT(9)

💖 NAME 💖

okay bestie, meet enum cmb_format from the Kernel API Manual — it's literally the enum for the types of supported measurement block formats. no cap, that's the whole assignment 💅

✨ SYNOPSIS ✨

here's the enum in all its exact glory, copy it character for character 🫶

enum cmb_format {
    CMF_BASIC ,
    CMF_EXTENDED ,
    CMF_AUTODETECT

};

🎀 Constants 🎀

these are the constants, and every single detail is staying:

• CMF_BASIC — the traditional channel measurement blocks, supported by all machines that we run on. iconic OG behavior 💖
• CMF_EXTENDED — the improved format that was introduced with the z990 machine. glow-up era ✨
• CMF_AUTODETECT — the default: use the extended format when running on a machine that supports extended format, otherwise fall back to basic format. main character energy with a backup plan 👑

🌈 SEE ALSO 🌈

go read these next, bestie — the whole squad is here:

• Kernel file ./drivers/s390/cio/cmf.c
• struct cmb_operations(9)
• struct cmb_area(9)
• struct cmb(9)
• struct cmbe(9)
• enable_cmf(9)
• __disable_cmf(9)
• disable_cmf(9)
• cmf_read(9)
• cmf_readall(9)
• cmf_reactivate(9)

later bestie 🫶 this page comes from ./drivers/s390/cio, and it's dated October 2026 — slay and goodbye 💋