gen_pool_dma_alloc(9)

📦 version 7.3.1, in nixpkgs unstable

💖 gen_pool_dma_alloc(9) — Kernel API Manual 💖

okay so bestie, welcome to the gen_pool_dma_alloc page — it's part of the Kernel API Manual and honestly it's giving "small but mighty" energy ✨

🌸 NAME 🌸

gen_pool_dma_alloc — allocate special memory from the pool for DMA usage 🫶

✨ SYNOPSIS ✨

void * gen_pool_dma_alloc (struct gen_pool *pool , size_t size ,
       dma_addr_t *dma );

🎀 ARGUMENTS 🎀

  • pool — the pool you're allocating from, like your fave stash of memory 💅
  • size — how many bytes you want to pull out of the pool, no cap
  • dma — the dma-view physical address return value. Pass NULL if you literally don't need it 🙈

🦋 DESCRIPTION 🦋

So here's the vibe: it allocates the requested number of bytes from the specified pool. It uses the pool allocation function (with the first-fit algorithm by default — that's the default, bestie, remember it 👑).

⚠️ It can not be used in an NMI handler on architectures without an NMI-safe cmpxchg implementation. Like, don't even try it there, fr fr 😭

🌈 RETURN 🌈

The virtual address of the allocated memory 💖 — or NULL on failure 💀

⭐ SEE ALSO ⭐

Kernel file ./lib/genalloc.c — and the whole friend group 👑:

that's the whole page, bestie, you ate it up 💅✨ and before you go — this icon was brought to you by ./lib, dated October 2026 🎀 see you in the next one, mwah! 🫶💜

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