hmm_dma_unmap_pfn(9)

💅 hmm_dma_unmap_pfn(9) — Kernel API Manual vibes 💅

okay so bestie, welcome to the Kernel API Manual page for hmm_dma_unmap_pfn(9). It's giving "small function, very specific job," and honestly? We respect it. 🫶

✨ NAME ✨

hmm_dma_unmap_pfn — Unmap a physical HMM page from DMA address. No cap, that's the whole name-and-purpose situation. 🎀

✨ SYNOPSIS ✨

bool hmm_dma_unmap_pfn (struct device *dev , struct hmm_dma_map *map ,
size_t idx );

✨ ARGUMENTS ✨

• dev — the device you're unmapping the page from. That's its whole deal here. 💻
• map — the HMM map. Yes bestie, the map. 🗺️
• idx — the index of the PFN to unmap. Very "point me at the exact one" energy. 👑

✨ DESCRIPTION ✨

So here's the tea: it returns true if the PFN was mapped and has been unmapped, and false otherwise. That's it. That's the function. Iconic, lowkey. 💖

✨ SEE ALSO ✨

Kernel file ./mm/hmm.c, plus the whole reference friend group:

• hmm_range_fault(9)
• hmm_range_fault_unlocked_timeout(9)
• hmm_dma_map_alloc(9)
• hmm_dma_map_free(9)
• hmm_dma_map_pfn(9)

mwah 💋 — with love from ./mm, October 2026, on hmm_dma_unmap_pfn(9) ✨ that's the cute little footer sign-off, bestie 🫶