ccwgroup_create_dev(9)

💫 ccwgroup_create_dev(9) 💫

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little s390-flavored baddie and honestly? she slays. we're talking ccwgroup_create_dev — the girl who creates and registers a ccw group device. main character energy fr fr 👑

---

🌸 SYNOPSIS 🌸

int ccwgroup_create_dev (struct device *parent , struct ccwgroup_driver
*gdrv , int num_devices , const char *buf );

like, that's the whole signature. she's not complicated, she just works. 💅

---

🎀 ARGUMENTS 🎀

• parent — the parent device for the new device. yes bestie, she needs a parent, we're not raising this device in the wild 🙈
• gdrv — the driver for the new group device. this is the vibe-setter, the driver in charge 🦋
• num_devices — number of slave devices. count 'em 🔢
• buf — buffer containing comma separated bus ids of slave devices. yep, comma separated bus ids, keep that in mind 🍓

---

✨ DESCRIPTION ✨

so what does she actually do? she creates and registers a new ccw group device as a child of parent. that's the whole assignment and she ate 🔥

the slave devices? obtained from the list of bus ids given in buf. so you hand her the comma separated bus ids and she goes and gets her girls 💖

---

🫶 RETURN 🫶

• 0 on success 🎉
• an error code on failure 😭 (and that's it, no in-between, no "maybe", periodt)

---

⭐ CONTEXT ⭐

non-atomic. so like, she's not doing that atomic thing, mkay? lowkey important to know 🧚

---

🌈 SEE ALSO 🌈

• kernel file ./drivers/s390/cio/ccwgroup.c — the source of truth, go read her 💜
• ccwgroup_set_online(9)
• ccwgroup_set_offline(9)
• ccwgroup_driver_register(9)
• ccwgroup_driver_unregister(9)
• ccwgroup_probe_ccwdev(9)
• ccwgroup_remove_ccwdev(9)

like the whole friend group, honestly. iykyk 💅

---

so yeah, that's the page 🦋 she lives in ./drivers/s390/cio and this little drop is dated October 2026 — take care of her bestie, and ngl you're gonna do great 🤍✨🎀