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[PATCH] x86_64: Don't oops at boot when empty Opteron node has IO

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The code to detect IO links on Opteron would not check
if the node had actually memory. This could lead to pci_bus_to_node
returning an invalid node, which might cause crashes later
when dma_alloc_coherent passes it to page_alloc_node().

The bug has been there forever but for some reason
it is causing now crashes.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-08-23 03:14:27 +02:00 committed by Linus Torvalds
parent 2bbfb16bf3
commit d3813fcf10
1 changed files with 11 additions and 2 deletions
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13
arch/x86_64/pci/k8-bus.c
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@ -47,13 +47,22 @@ fill_mp_bus_to_cpumask(void)
* if there are no busses hanging off of the current
* ldt link then both the secondary and subordinate
* bus number fields are set to 0.
*
* RED-PEN
* This is slightly broken because it assumes
* HT node IDs == Linux node ids, which is not always
* true. However it is probably mostly true.
*/
if (!(SECONDARY_LDT_BUS_NUMBER(ldtbus) == 0
&& SUBORDINATE_LDT_BUS_NUMBER(ldtbus) == 0)) {
for (j = SECONDARY_LDT_BUS_NUMBER(ldtbus);
j <= SUBORDINATE_LDT_BUS_NUMBER(ldtbus);
j++)
pci_bus_to_node[j] = NODE_ID(nid);
j++) {
int node = NODE_ID(nid);
if (!node_online(node))
node = 0;
pci_bus_to_node[j] = node;
}
}
}
}