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Subject[PATCH 2/4] x86_64: fix dma_alloc_pages v2

one system with two nodes and two ht links on every node.
the bios already have _pxm for two links.

when no ram installed for node1 will have panic.

reason: the device on second chain will get node = 1 from dev_to_node...via
but node1 doesn't have ram installed.
in dma_alloc_pages it will pass check with first_node(node_online_map)...
and will have problem with __alloc_pages in alloc_pages_node.

this patch will use updated dev_to node, so remove check about fist_node etc

Signed-off-by: Yinghai Lu <>

Index: linux-2.6/arch/x86/kernel/pci-dma_64.c
--- linux-2.6.orig/arch/x86/kernel/pci-dma_64.c
+++ linux-2.6/arch/x86/kernel/pci-dma_64.c
@@ -53,12 +53,6 @@ dma_alloc_pages(struct device *dev, gfp_
int node;

node = dev_to_node(dev);
- if (node == -1)
- node = numa_node_id();
- if (node < first_node(node_online_map))
- node = first_node(node_online_map);
page = alloc_pages_node(node, gfp, order);
return page ? page_address(page) : NULL;

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