subsys_virtual_register(9)

🌸 NAME 🌸

okay so bestie, meet subsys_virtual_register(9) from the Kernel API Manual — it's literally the function that registers a subsystem at /sys/devices/virtual/. slay 💅

✨ SYNOPSIS ✨

int subsys_virtual_register (const struct bus_type *subsys , const
       struct attribute_group **groups );

🎀 ARGUMENTS 🎀

• subsys — the virtual subsystem. that's the main character right there 👑
• groups — default attributes for the root device. the root device's lil starter pack 🎁

🦋 DESCRIPTION 🦋

okay so here's the vibe check: all 'virtual' subsystems have a /sys/devices/system/<name> root device with the name of the subsystem. the root device can carry subsystem-wide attributes. all registered devices are below this single root device. there's no restriction on device naming — literally none, name it whatever, no cap. this is for kernel software constructs which need sysfs interface. periodt. 💖

🌈 SEE ALSO 🌈

Kernel file ./drivers/base/bus.c — and the whole friend group is right here, bestie:

• bus_to_subsys(9)
• bus_for_each_dev(9)
• bus_find_device(9)
• bus_for_each_drv(9)
• bus_add_device(9)
• bus_probe_device(9)
• bus_remove_device(9)
• bus_add_driver(9)
• bus_remove_driver(9)
• bus_rescan_devices(9)
• device_reprobe(9)
• bus_register(9)
• bus_unregister(9)
• subsys_dev_iter_init(9)
• subsys_dev_iter_next(9)
• subsys_dev_iter_exit(9)
• subsys_system_register(9)
• driver_find(9)
• bus_get_dev_root(9)

mwah 💋 cute lil sign-off time: source/version is ./drivers/base, date is October 2026, and the page is subsys_virtual_register(9) — that's the whole footer energy, no cap 🫶✨