X86_MATCH_CPU(9)

💅 X86_MATCH_CPU(9) — the Kernel API Manual, bestie edition 🎀

okay so first things first, the manual name is X86_MATCH_CPU and this whole page lives in the Kernel API Manual ✨ — that's the vibe check, now let's get into it 🦋

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✨ NAME ✨

X86_MATCH_CPU — the base macro for CPU matching, the mother of all matchers, the main character 👑

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🌸 SYNOPSIS 🌸

X86_MATCH_CPU (_vendor , _family , _model , _steppings , _feature ,
_type , _data );

literally that's it, that's the whole signature, no cap 💖

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🎀 ARGUMENTS 🎀

• _vendor — the vendor name, like INTEL, AMD, HYGON, ..., ANY. lowkey the cool part: the name gets expanded to X86_VENDOR__vendor 🪄
• _family — the family number, or X86_FAMILY_ANY if you're in your "idc, any family" era 🙈
• _model — the model number, a model constant, or X86_MODEL_ANY (again: picky or not picky, your call) 💁‍♀️
• _steppings — a bitmask for steppings, a stepping constant, or X86_STEPPING_ANY ⭐
• _feature — an X86_FEATURE bit, or X86_FEATURE_ANY 🔥
• _type — honestly? -- undescribed -- 😭 the manpage literally says nothing about this one. it's giving mystery, it's giving cryptic, i cannot make up lore that isn't there, so: undescribed, bestie, that's canon 💀
• _data — driver specific data or NULL. the internal storage format is unsigned long, and whatever value, pointer, etc. you supply gets casted to unsigned long internally. yup, casted. slay 🫶

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🦋 DESCRIPTION 🦋

use this one only if you need all the selectors. that's the whole deal — it's the full-set macro, the all-inclusive package 🌈

otherwise? use one of the shorter macros of the X86_MATCH_* family. they're right there, they're cute, they're less typing 💅

and if there's no matching shorthand macro for what you need, consider adding one — like, be the change you want to see in the kernel, periodt ✨

and if you really need to wrap one of these macros into another macro at the usage site for good reasons, then please start that local macro with X86_MATCH so it's easy to grep. yes, this is a real request, respect the naming convention, it's literally for everyone's sanity 🔍🫶

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💜 SEE ALSO 💜

• Kernel file ./arch/x86/include/asm/cpu_device_id.h — go read it, iykyk 📖
• X86_MATCH_VENDOR_FAM_FEATURE(9)
• X86_MATCH_VENDOR_FEATURE(9)
• X86_MATCH_FEATURE(9)
• X86_MATCH_VENDOR_FAM_MODEL(9)
• X86_MATCH_VENDOR_FAM(9)
• X86_MATCH_VFM(9)
• X86_MATCH_VFM_STEPS(9)
• X86_MATCH_VFM_FEATURE(9)
• X86_MATCH_VFM_CPU_TYPE(9)

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bestie this page came from ./arch/x86/include/asm and it's dated October 2026, and the page itself is X86_MATCH_CPU(9) — that's the whole sign-off, mwah 💋🌟