disable_cmf(9)

💅 disable_cmf(9) — the Kernel API Manual, bestie edition 🎀

okay so real talk, this is a page from the Kernel API Manual (disable_cmf(9)) and it's genuinely so straightforward you're gonna eat it up. no cap.

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✨ NAME ✨

disable_cmf — switch off the channel measurement for a specific device 🫶

like, one device. just that one. we're not doing a whole sweep here, iykyk.

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🌸 SYNOPSIS 🌸

int disable_cmf (struct ccw_device *cdev );

that's it. that's the whole vibe. one function, one argument, returns an int. iconic.

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🦋 ARGUMENTS 🦋

• cdev — The ccw device to be disabled 🌈

literally just pass it the device you want to turn off and let it cook. yes bestie, that device, the ccw one.

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⭐ RETURN ⭐

0 for success or a negative error value 💀

so like, zero means slay, negative means something went sideways. check it. please. 🙈

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🧚 CONTEXT 🧚

non-atomic 💅

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🔥 SEE ALSO 🔥

bestie, there's a whole friend group here, go say hi 👑

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

heads up bestie: enable_cmf(9) is literally the opposite energy of this page, and __disable_cmf(9) is the underscore twin — go read those if you want the full lore ✨

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and that's the whole page, periodt 🎀

little sign-off moment: this gem lives in ./drivers/s390/cio, and it was dated October 2026 — so go forth, disable that channel measurement, and stay hydrated 💖🦋💜