snd_pcm_lib_...llocate_free(9)

💅 snd_pcm_lib_...llocate_free(9) 💅

okay so this is a page from the Kernel API Manual, bestie — the title got a lil truncated in the header (snd_pcm_lib_...llocate_free(9), the ellipsis is literally how it shows up, not me being lazy ✨), and honestly the real name you want is snd_pcm_lib_preallocate_free. Say that three times fast. 🎀

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🌸 NAME 🌸

snd_pcm_lib_preallocate_free — release the preallocated buffer of the specified substream. yes that's it. that's the whole gig. she's a free-er, not an allo-er. 💅

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✨ SYNOPSIS ✨

void snd_pcm_lib_preallocate_free (struct snd_pcm_substream *substream);

no return value, no drama, she just goes in and cleans up. void energy fr fr. 🫶

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🦋 ARGUMENTS 🦋

• substream — the pcm substream instance 🎀 like, the actual substream object you're handing over so she knows whose buffer she's yeeting.

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💖 DESCRIPTION 💖

Releases the pre-allocated buffer of the given substream. 🧹✨

that's the vibe check. you point her at a substream, she frees the pre-allocated buffer that belongs to it. no cap, that is the entire personality. lowkey iconic for how simple she is. 👑

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🌈 SEE ALSO 🌈

• Kernel file ./sound/core/pcm_memory.c — go read the source bestie, it's giving receipts 📖
• snd_pcm_lib_preallocate_free_for_all(9)
• snd_pcm_lib_preallocate_pages(9)
• snd_pcm_lib_preallocate_pages_for_all(9)
• snd_pcm_set_managed_buffer(9)
• snd_pcm_set_managed_buffer_all(9)
• snd_pcm_lib_malloc_pages(9)
• snd_pcm_lib_free_pages(9)

the whole preallocate/free friend group 🫶 they all run together, iykyk.

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💀 reminder that these are kernel-level buffer functions — nobody's stopping you from being silly, but the kernel will not be cute about it. respect the substream.

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mwah 💋 this came out of the ./sound/core corner of the tree, October 2026, and it's filed under the Kernel API Manual — so if you ever forget where you read it, it's snd_pcm_lib_...llocate_free(9), ellipsis and all, bestie. periodt. 🌟