[PATCH] x86-64: Micro optimization to dma_alloc_coherent node lookup
Use pcibus_to_node directly Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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arch/x86_64/kernel
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@ -191,11 +191,9 @@ static void *dma_alloc_pages(struct device *dev, unsigned gfp, unsigned order)
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{
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struct page *page;
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int node;
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if (dev->bus == &pci_bus_type) {
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cpumask_t mask;
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mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
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node = cpu_to_node(first_cpu(mask));
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} else
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if (dev->bus == &pci_bus_type)
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node = pcibus_to_node(to_pci_dev(dev)->bus);
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else
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node = numa_node_id();
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page = alloc_pages_node(node, gfp, order);
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return page ? page_address(page) : NULL;
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