dma_chan_is_local(9)

💅 dma_chan_is_local(9) 💅

okay so bestie, this page is from the Kernel API Manual — manual name folded in near the top like a cute lil name tag 🎀 — and the whole main-character topic is dma_chan_is_local(9). no cap.

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💖 NAME 💖

dma_chan_is_local — checks if the channel is in the same NUMA-node as the CPU.

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✨ SYNOPSIS ✨

bool dma_chan_is_local (struct dma_chan *chan , int cpu );

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🎀 ARGUMENTS 🎀

• chan — DMA channel to test. this is the one you're vibe-checking 💅
• cpu — CPU index which the channel should be close to. like, the CPU it should be near 🫶

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🦋 DESCRIPTION 🦋

Returns true if the channel is in the same NUMA-node as the CPU. that's literally it, and honestly? iconic ✨ iykyk.

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🌸 SEE ALSO 🌸

bestie, the full lore starts at the Kernel file ./drivers/dma/dmaengine.c, and then you can go off:

• dev_to_dma_chan(9)
• struct dma_chan_tbl_ent(9)
• min_chan(9)
• dma_channel_rebalance(9)
• balance_ref_count(9)
• dma_chan_get(9)
• dma_chan_put(9)
• dma_find_channel(9)
• dma_issue_pending_all(9)
• dma_get_slave_channel(9)
• __dma_request_channel(9)
• dma_request_chan(9)
• dma_request_chan_by_mask(9)
• devm_dma_request_chan(9)
• dmaengine_get(9)
• dmaengine_put(9)
• dma_async_device_register(9)
• dma_async_device_unregister(9)
• dmaenginem_async_device_register(9)
• dma_wait_for_async_tx(9)
• dma_run_dependencies(9)

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🫶 xoxo, your kernel bestie — source/version ./drivers/dma, dated October 2026, and yes this was dma_chan_is_local(9) the whole time 💖 periodt.