ida_alloc_max(9)

✨ ida_alloc_max ✨

okay so bestie, welcome to the Kernel API Manual — this is the page for ida_alloc_max(9) and honestly it's giving "tiny function, big job" energy 👑

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🌸 NAME 🌸

ida_alloc_max — snag yourself an unused ID 💖

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🎀 SYNOPSIS 🎀

int ida_alloc_max (struct ida *ida , unsigned int max , gfp_t gfp );

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🦋 ARGUMENTS 🦋

• ida — your IDA handle, aka the lil data structure you're pulling IDs out of 🫶
• max — the highest ID you're allowed to allocate. Like the ceiling. The limit. Respect it ✋
• gfp — the memory allocation flags, iykyk 🌈

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💅 DESCRIPTION 💅

So what does it do? It allocates an ID that lives somewhere between 0 and max, inclusive — yes bestie, inclusive, max is allowed, we're not gatekeeping 🔥

That's it. That's the whole vibe. A number, from zero up to and including your max. Slay.

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⭐ CONTEXT ⭐

Any context. Literally any 💀 And the best part: it is safe to call this function without locking in your code — no cap, no manual lock needed, the function handles itself, main character energy fr fr 👑

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🔥 RETURN 🔥

• the allocated ID 🎉 — that's the win
• or -ENOMEM if memory could not be allocated 😭
• or -ENOSPC if there are no free IDs left 🌸 (sorry bestie, the well ran dry)

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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_ul(9)
• idr_for_each_entry_continue(9)
• idr_for_each_entry_continue_ul(9)
• ida_alloc(9)
• ida_alloc_min(9)

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and that's the page!! 🫶 it lives in ./include/linux, it's dated October 2026, and it's part of the Kernel API Manual — go forth and allocate responsibly bestie 💜🎀