css_sched_sch_todo(9)

✨ NAME ✨

css_sched_sch_todo — schedule a subchannel operation 💅

okay so welcome to the css_sched_sch_todo(9) page from the Kernel API Manual, bestie. This is the function that schedules a subchannel operation, and it's giving “small but important kernel helper” energy, fr fr.

✨ SYNOPSIS ✨

void css_sched_sch_todo (struct subchannel *sch , enum sch_todo todo );

✨ ARGUMENTS ✨

• sch — subchannel. That's the subchannel it's working with 🎀.
• todo — todo. That's the operation identifier, and the manpage is literally just calling it “todo,” so we respect the minimalism 💅.

✨ DESCRIPTION ✨

Schedule the operation identified by todo to be performed on the slow path workqueue. If another operation with higher priority is already scheduled, do nothing — like, literally nothing, no cap 😭.

Needs to be called with the subchannel lock held. Don't skip that part, bestie 🫶.

✨ SEE ALSO ✨

Kernel file ./drivers/s390/cio/css.c — go peek at these besties:

• css_sch_device_unregister(9)
• css_sch_is_valid(9)
• css_driver_register(9)
• css_driver_unregister(9)

that's the whole page, bestie — source/version ./drivers/s390/cio, date October 2026, manual css_sched_sch_todo(9), mwah 💋✨