snd_ctl_add...wer_uncached(9)

💖 NAME 💖

okay so bestie, this is a page from the Kernel API Manual, and the function we're stanning today is:

snd_ctl_add_follower_uncached — literally just Add a virtual follower control 🎀

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✨ SYNOPSIS ✨

here's the whole vibe, exactly as written, no cap:

int snd_ctl_add_follower_uncached (struct snd_kcontrol *master , struct
snd_kcontrol *follower );

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🎀 ARGUMENTS 🎀

• master — the vmaster element 🫶 like, the main character here
• follower — the follower element you're adding, bestie 💅

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🦋 DESCRIPTION 🦋

so the whole thing is: you take a virtual follower control and you add it to the given master. slay. ✨

but here's the twist — and this is the important part — unlike snd_ctl_add_follower, the element you add via this function is supposed to have volatile values 🫧 and its get callback is called at each time queried from the master. literally every single time. no caching, no stale vibes, iykyk 💀

and when does that matter? when the control peeks the hardware values directly 👀 and the value can be changed by other means than the put callback of the element — that's exactly the situation where this function should be used, to keep the value always up-to-date. periodt. 🌈

fr fr, if your control reads the hardware live and something else can change the value behind your back, this is the one you want 🧚

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🌸 RETURN 🌸

• Zero if it worked — she ate, no notes 👑
• a negative error code if it didn't 😭

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💅 SEE ALSO 💅

• Kernel file ./include/sound/control.h 🍓
• snd_ctl_find_id_mixer(9)
• snd_ctl_add_follower(9)

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and that's the whole page, bestie 🦋 this cutie lives in ./include/sound and was dated October 2026 — mwah, go read the kernel source, ily, bye 💜💖✨