acpi_set_modalias(9)

💖 acpi_set_modalias — a.k.a. the acpi_set_modalias(9) kernel API page, bestie edition 💖

okay so this is a page from the Kernel API Manual and it's literally about setting a modalias. yes, that modalias. sit down, grab a strawberry, we're doing this 🍓

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✨ NAME ✨

acpi_set_modalias — set modalias using the "compatible" property or a supplied ID. that's it, that's the whole vibe. no cap. 💅

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🌸 SYNOPSIS 🌸

void acpi_set_modalias (struct acpi_device *adev , const char
*default_id , char *modalias , size_t len );

look at her. iconic signature. four params, void return, zero drama (until the buffer's too small, but that's a len problem, not ours 🙈).

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🎀 ARGUMENTS 🎀

• adev — the ACPI device object we're trying to match. this is the main character of the function, fr fr. 👑
• default_id — the ID string we fall back to if there's, like, no compatible string found. the backup bestie. 🫶
• modalias — a pointer to the buffer where the modalias value gets copied into. it's giving "here's where the answer goes". ✨
• len — the length of the modalias buffer. know your limits, babe. 💀

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🦋 DESCRIPTION 🦋

so here's the tea: this is the counterpart of of_alias_from_compatible for struct acpi_device objects. like, the ACPI version of that whole situation. 💖

if there is a compatible string for adev, it gets copied into modalias — but with the vendor prefix stripped, okay? stripped. gone. not invited. ✂️✨

otherwise — and this is the important bit — default_id will be used instead. so either way you're walking out of here with something in that buffer. slay. 💅

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🌈 SEE ALSO 🌈

the whole friend group, alive and well, living in the kernel file ./drivers/acpi/bus.c:

• acpi_bus_notify(9)
• devm_acpi_install_notify_handler(9)
• acpi_bus_get_primary_device(9)
• acpi_get_first_physical_node(9)
• acpi_device_is_first_physical_node(9)
• acpi_of_match_device(9)
• acpi_match_acpi_device(9)
• acpi_match_device(9)
• acpi_bus_find_device_by_name(9)
• acpi_early_init(9)
• acpi_subsystem_init(9)

go read them. iykyk. 📚🦋

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and that's the page!! 🎀 this one lives in ./drivers/acpi, dated October 2026, and it's the acpi_set_modalias(9) entry in the Kernel API Manual. mwah. obsessed. bye bestie 💜🌸