idr_get_next_ul(9)

💖 NAME 💖

idr_get_next_ul — bestie, it finds the next populated entry. That's the whole vibe ✨

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🌸 SYNOPSIS 🌸

void * idr_get_next_ul (struct idr *idr , unsigned long *nextid );

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🎀 ARGUMENTS 🎀

• idr — your IDR handle 🫶 the little tree you're digging through.
• nextid — a pointer to an ID. Yeah, a pointer — we're doing pointer things, keep up 💅

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🦋 DESCRIPTION 🦋

okay so listen. idr_get_next_ul returns the next populated entry in the tree whose ID is greater than or equal to the value that nextid is pointing at. Slay 🔥

On exit, nextid gets updated to the ID of the value it found — literally it rewrites itself to tell you where it landed 👑

And here's the part everyone forgets, no cap: to use it in a loop, the value pointed to by nextid must be incremented by the user. Like, by you. Manually. It does not do it for you 😭 so don't come crying to me when you get the same entry forever, iykyk.

fr fr: increment it yourself or you're stuck in an infinite loop and that's on you, not on the kernel 💀

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👑 SEE ALSO 👑

Kernel file ./lib/idr.c — and the whole friend group:

• idr_alloc_u32(9)
• idr_alloc(9)
• idr_alloc_cyclic(9)
• idr_remove(9)
• idr_find(9)
• idr_for_each(9)
• idr_get_next(9)
• idr_replace(9)
• IDA description(9)
• ida_alloc_range(9)
• ida_find_first_range(9)
• ida_free(9)
• ida_destroy(9)

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mmm okay that's the whole page, you ate that 🍓 stay hydrated, go increment your nextid, and remember: this one lives in ./lib, dated October 2026, and it's idr_get_next_ul(9) — main character energy only 💜✨