STRUCT RESOURCE_CONSTRAINT(9)

💅 struct resource_constraint(9) — Kernel API Manual, bestie edition 🎀

okay so this is a page straight out of the Kernel API Manual, and honestly? it's a little icon and you're gonna love it.

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✨ NAME ✨

struct resource_constraint — the constraints you gotta meet while you're out here searching for empty resource space 🦋

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✨ SYNOPSIS ✨

struct resource_constraint {
    resource_size_t min, max, align;
    resource_alignf alignf;
    void *alignf_data;
 };

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✨ Members ✨

• min — the minimum address for the memory range, like the floor, the lower bound, the "don't even think about going below this" 💜
• max — the maximum address for the memory range, aka the ceiling, the upper limit, the "that's far enough thanks" 🌸
• align — the alignment for the start address of the empty space. gotta line up, no cap ✨
• alignf — additional alignment constraints callback. extra vibes, extra rules 🎀
• alignf_data — the data provided for the alignf callback. it's giving "here's everything you need to do your thing" 🫶

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✨ DESCRIPTION ✨

So basically this struct contains the range and alignment constraints that have to be met during find_resource_space. that's the whole job, that's the assignment. 💅

and here's the cute part: alignf can be NULL, indicating no alignment beyond align is necessary. so if you don't need the extra callback energy, just pass NULL and live your life 😌 no drama, no extra constraints.

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✨ SEE ALSO ✨

go check out the kernel file ./include/linux/ioport.h plus resource_alignf(9), resource_set_size(9), and resource_set_range(9) 🧚 iykyk

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fr fr, every single member here matters — miss one and your empty-space search is gonna have a bad time 😭

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that's the whole page bestie, slay 💖 this one lives under ./include/linux in the Kernel API Manual, dated October 2026 — periodt, go read the source 👑