dma_alloc_from_contiguous(9)

📦 version 7.3.1, in nixpkgs unstable

💖 dma_alloc_from_contiguous(9) 💖

okay so bestie, this is a page straight out of the Kernel API Manual — it's literally called dma_alloc_from_contiguous(9) and it's all about grabbing pages from a contiguous area. no cap, it's a good one. 🎀

✨ NAME ✨

dma_alloc_from_contiguous — allocate pages from contiguous area 🦋

🌸 SYNOPSIS 🌸

struct page * dma_alloc_from_contiguous (struct device *dev , size_t
       count , unsigned int align , bool no_warn );

like, that's the whole vibe — it hands you back a struct page *, periodt. 👑

🎀 ARGUMENTS 🎀

  • dev — pointer to the device you're doing this allocation for, bestie. it's giving "who is this for" energy. 💅
  • count — the requested number of pages. literally how many you want. 🔥
  • align — the requested alignment of pages, and jsyk it's in PAGE_SIZE order. ✨
  • no_warn — avoid printing the message about a failed allocation. like, keep it quiet, no drama pls. 🙈

🦋 DESCRIPTION 🦋

so here's the tea ☕ — this function allocates a memory buffer for the specified device. it uses the device specific contiguous memory area if available, or else the default global one. slay. 🌈

it requires the architecture specific dev_get_cma_area helper function — so like, don't come for this function unless your arch has that hookup, iykyk. 💜

👑 SEE ALSO 👑

Kernel file ./kernel/dma/contiguous.c, plus these iconic little friends:

go read them, they ate. 💅🔥

and that's the page!! mwah 💋 — this one lives in ./kernel/dma, dated October 2026, and it's filed under dma_alloc_from_contiguous(9). byeee bestie, go allocate something cute 🫶🎀

📦 where this page comes from