idr_for_each_entry_ul(9)

🌟 idr_for_each_entry_ul(9) — Kernel API Manual 🌟

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🌸 NAME 🌸

idr_for_each_entry_ul — okay so bestie, this one iterates over an IDR’s elements of a given type. It’s giving “walk the entries, but typed” energy, and honestly? Iconic. ✨

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✨ SYNOPSIS ✨

The call itself, literally exactly like this:

idr_for_each_entry_ul (idr , entry , tmp , id );

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🎀 ARGUMENTS 🎀

• idr — the IDR handle. That’s the main-character object you’re working with, no cap. 💅
• entry — the type * to use as cursor. Yep, that’s your little pointer bestie moving through the loop. 🦋
• tmp — a temporary placeholder for ID. It’s just holding space, periodt. 🎀
• id — the entry ID. The actual ID, fr fr. ⭐

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💅 DESCRIPTION 💅

So here’s the tea: entry and id do not need to be initialized before the loop. Not me expecting you to pre-game them — you literally don’t have to. 🙈

And after the loop terminates normally, entry is left with the value NULL. That is highkey convenient for a "not found" value — like if you need a “nope, nothing here” result, it’s already serving that. 💖

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🦋 SEE ALSO 🦋

Kernel file: ./include/linux/idr.h

• IDR_INIT(9)
• DEFINE_IDR(9)
• idr_get_cursor(9)
• idr_set_cursor(9)
• idr sync(9)
• idr_init_base(9)
• idr_init(9)
• idr_is_empty(9)
• idr_preload_end(9)
• idr_for_each_entry(9)
• idr_for_each_entry_continue(9)
• idr_for_each_entry_continue_ul(9)
• ida_alloc(9)
• ida_alloc_min(9)
• ida_alloc_max(9)

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Okurrr, that’s the page! Cute sign-off time: this one comes from ./include/linux, with a date stamp of October 2026, for idr_for_each_entry_ul(9). Catch you in the next man page, bestie 🫶💜✨