ida_alloc(9)

💖 NAME 💖

ida_alloc — bestie, this one hands you an unused ID ✨

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🎀 SYNOPSIS 🎀

int ida_alloc (struct ida *ida , gfp_t gfp );

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🦋 ARGUMENTS 🦋

• ida — your IDA handle, the little main character holding all the IDs 🫶
• gfp — the memory allocation flags, aka how you're allowed to ask for memory 👑

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🌸 DESCRIPTION 🌸

okay so picture this: you need an ID, right? ida_alloc literally allocates an unused ID for you, and it's gonna be somewhere between 0 and INT_MAX, inclusive — both ends included, no gatekeeping 💅

that's it. that's the whole vibe. slay.

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⭐ CONTEXT ⭐

any context. periodt. and yes, it is safe to call this function without locking in your code — no cap, you don't gotta hold a lock yourself 🧚

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🔥 RETURN 🔥

• the allocated ID — the good ending 💖
• -ENOMEM if memory could not be allocated 😭
• -ENOSPC if there are no free IDs left 💀

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🌈 SEE ALSO 🌈

kernel file ./include/linux/idr.h (iykyk), plus the whole friend group:

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_ul(9), idr_for_each_entry_continue(9), idr_for_each_entry_continue_ul(9), ida_alloc_min(9), ida_alloc_max(9)

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and that's the page, bestie 🎀 this one lives in ./include/linux, dated October 2026, and it answers to ida_alloc(9) — mwah 💋