drm_privacy...n_lookup_add(9)

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

Okay so this one lives in the 9 section of the Kernel API Manual — it's a kernel function page, and honestly? It's a short one, but it's important so stay with me 🫶

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✨ NAME ✨

drm_privacy_screen_lookup_add — adds one entry to the static privacy-screen lookup list. That's it, that's the whole job 💖

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🌸 SYNOPSIS 🌸

void drm_privacy_screen_lookup_add (struct drm_privacy_screen_lookup *lookup );

It returns void, so like… nothing comes back out. No return value to obsess over, no error code to check. It just does the thing 👑

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🎀 ARGUMENTS 🎀

• lookup — the lookup list entry you wanna add. That's the whole argument list, one (1) singular struct pointer, we love a low-effort signature ✨

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🦋 DESCRIPTION 🦋

So the vibe here is: you call this, and it adds an entry to the static privacy-screen lookup list. Simple, right? But here's the part where you need to pay attention, bestie, because this is the main character caveat 👀

The struct list_head that lives inside your struct drm_privacy_screen_lookup? It gets added to a list that's owned by the privacy-screen core. Not by you. Not by your driver. By the core. So you are not the owner anymore, you're like… the cool aunt who dropped the kid off at a sleepover 🙈

Which means — and I need you to hear me on this — the struct drm_privacy_screen_lookup you passed in must not be free-ed until it gets removed from the lookup list. And the way you remove it is by calling drm_privacy_screen_lookup_remove. Periodt. 💀

Freeing that struct early is a one-way ticket to use-after-free town and the kernel will not be nice about it. Do the remove call first, then free. In that order. No cap 🔥

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💜 SEE ALSO 💜

Go binge the related lore, bestie, it's all connected 🧚

• Kernel file ./drivers/gpu/drm/drm_privacy_screen.c overview(9)
• drm_privacy_screen_lookup_remove(9)
• drm_privacy_screen_get(9)
• drm_privacy_screen_put(9)
• drm_privacy_screen_set_sw_state(9)
• drm_privacy_screen_get_state(9)
• drm_privacy_screen_register_notifier(9)
• drm_privacy_screen_unregister_notifier(9)
• drm_privacy_screen_register(9)
• drm_privacy_screen_unregister(9)
• drm_privacy_screen_call_notifier_chain(9)

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🌈 sign-off 🌈

This little icon comes to you straight from ./drivers/gpu/drm, dated October 2026 — screenshot it, frame it, put it on your wall 💅✨ mwah, go add your lookups responsibly 🎀