for_each_padev(9)

💅 for_each_padev — like, the whole device tree, but make it a walk

okay so bestie, you found the for_each_padev(9) page in the Kernel API Manual and honestly? it's giving "short but iconic." let me break it down for you 🫶

---

✨ NAME ✨

for_each_padev — iterate over, like, every single device in the tree. all of them. no skipping. 💖

---

🎀 SYNOPSIS 🎀

int for_each_padev (int (*fn)(struct device *, void *) , void * data );

---

🌸 ARGUMENTS 🌸

• fn — the function you want called on each device. your little callback bestie that gets pinged for every node, no cap.
• data — whatever data you want passed along to that called function. it just gets handed straight through. 🧚

---

🦋 DESCRIPTION 🦋

so here's the vibe: this does a depth-first traversal of the tree, and it calls the function you passed in for each node. 💅

and the order matters — it calls the function for parents before children. yes, that's the whole point. main character parent energy first, then the kids. periodt. 👑

---

🔥 SEE ALSO 🔥

Kernel file ./arch/parisc/kernel/drivers.c — and like, the entire friend group:

• match_device(9)
• register_parisc_driver(9)
• count_parisc_driver(9)
• unregister_parisc_driver(9)
• find_pa_parent_type(9)
• print_pa_hwpath(9)
• get_pci_node_path(9)
• print_pci_hwpath(9)
• alloc_tree_node(9)
• register_parisc_device(9)
• match_pci_device(9)
• match_parisc_device(9)
• parse_tree_node(9)
• hwpath_to_device(9)
• device_to_hwpath(9)
• walk_native_bus(9)
• walk_central_bus(9)
• init_parisc_bus(9)
• print_parisc_devices(9)

go read them too, iykyk 📚✨

---

ngl bestie, that's the whole page. depth-first, parents first, call the function on every node. ate and left no crumbs. 🍓

---

okay and for the little sign-off moment: this one lives in ./arch/parisc/kernel, it's the October 2026 edition, and the page itself is for_each_padev(9). that's a wrap, mwah 💋🌈