Re: [PATCH 02/26] x86-64, NUMA: Simplify hotplug node handling inacpi_numa_memory_affinity_init()

[Tejun Heo]

Hello, Yinghai.

On Sat, Feb 12, 2011 at 10:13:51AM -0800, Yinghai Lu wrote:
> > Eh?  The oldnode thing will restore the node to initial state thus
> > fulfilling the node empty condition.  Am I missing something?
> > 
> 
> yes. nd get restored, but it keep node_parsed set for that kind of node.

So, this is the code snippet.  Both @nd->start and end are zero and
nodes_parsed for @node is clear.

	nd = &nodes[node];
	oldnode = *nd;

@oldnode->start, end == 0.

	if (!node_test_and_set(node, nodes_parsed)) {
		nd->start = start;
		nd->end = end;
This path is taken and @nd->start and end are set.
	} else {
		if (start < nd->start)
			nd->start = start;
		if (nd->end < end)
			nd->end = end;
	}

	printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
	       start, end);

	if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
		update_nodes_add(node, start, end);
		/* restore nodes[node] */
		*nd = oldnode;
@nd->start and end are restored to zero.
		if ((nd->start | nd->end) == 0)
			node_clear(node, nodes_parsed);
and @nodes_parsed is cleared.
	}

So, what the hell am I missing?

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/