trace_s390_cio_csch(9)

🎀 trace_s390_cio_csch 🎀

okay so bestie, welcome to the Kernel API Manual entry for trace_s390_cio_csch — yes she's a function, yes she's a tracepoint helper, and yes she's iconic in a deeply nerdy s390 way 💅

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✨ NAME ✨

trace_s390_cio_csch — literally the "Clear Subchannel instruction (CSCH) was performed" moment. that's it, that's the whole vibe. a CSCH happened, and this is the thing that announces it 🦋

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🌸 SYNOPSIS 🌸

void trace_s390_cio_csch (struct subchannel_id schid , int cc );

look at her. returns void — she gives nothing back, she's purely here to report 👑

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💖 ARGUMENTS 💖

• schid — the Subchannel ID. like, which subchannel are we even talking about, bestie? this is the answer 🫶
• cc — the Condition code. the little status number that comes along for the ride ✨

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🔥 SEE ALSO 🔥

the whole friend group honestly, plus the kernel file they all live in:

Kernel file ./drivers/s390/cio/trace.h trace_s390_cio_stsch(9),
trace_s390_cio_msch(9), trace_s390_cio_tsch(9), trace_s390_cio_tpi(9),
trace_s390_cio_ssch(9), trace_s390_cio_hsch(9), trace_s390_cio_xsch(9),
trace_s390_cio_rsch(9), trace_s390_cio_chsc(9),
trace_s390_cio_interrupt(9), trace_s390_cio_adapter_int(9),
trace_s390_cio_stcrw(9)

not to be dramatic but the s390 cio tracepoint squad ate and left absolutely no crumbs 😭🔥

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aaaand that's the page!! source: ./drivers/s390/cio, and she was dated October 2026 — this whole thing is trace_s390_cio_csch(9) from the Kernel API Manual, mwah, slay, periodt 💜🎀