itcw_set_data(9)

💅 itcw_set_data — the itcw manual, kernel API edition ✨

okay so bestie, welcome to the itcw_set_data(9) page from the Kernel API Manual — this is the one that sets the data address and the tida flag of the itcw, and honestly? it's giving "small function, big responsibilities" 🎀

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✨ NAME ✨

itcw_set_data — set data address and tida flag of the itcw 🦋

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🌸 SYNOPSIS 🌸

void itcw_set_data (struct itcw *itcw , void *addr , int use_tidal );

like, that's the whole vibe check right there — void return, three args, no drama 💜

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🫶 ARGUMENTS 🫶

• itcw — the address of the itcw. yes queen, you gotta tell her which itcw you're talking to 👑
• addr — the data address. literally the address of your data, that's it, that's the girl 🌈
• use_tidal — okay so when this is zero, the data address specifies a contiguous block of data; when it's non-zero, the data address specifies a list if tidaws 🔥 (that's the tida-list life, iykyk)

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💖 DESCRIPTION 💖

So what does she actually do? itcw_set_data sets the input/output data address of the itcw — and which one it counts as (input vs output) depends on the value of the r-flag and the w-flag, no cap 😭

And here's the extra bit: if use_tidal is non-zero, the corresponding tida flag gets set as well. so it's a two-for-one situation, we love efficiency ✨

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/s390/cio/itcw.c
• itcw_get_tcw(9)
• itcw_calc_size(9)
• itcw_init(9)
• itcw_add_dcw(9)
• itcw_add_tidaw(9)
• itcw_finalize(9)

go read the whole friend group, they're all icons 💅

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ngl this one's short and sweet — but do not sleep on the r-flag / w-flag situation, that's the part that decides whether your address is reading or writing 🫶

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mwah 💋 this page came straight out of ./drivers/s390/cio, and the version stamp says October 2026 — so yeah, she's from the future, and she's iconic for it ⭐🧚‍♀️🍓