linux-kernel - Re: [PATCH 02/26] x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <AANLkTim3bSWKYcwoJ5+GCO-rPWfXgGEvS1JUbgKx+3f+@mail.gmail.com>
Date:	Mon, 14 Feb 2011 08:12:10 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, brgerst@...il.com,
	gorcunov@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
	mingo@...e.hu, hpa@...ux.intel.com
Subject: Re: [PATCH 02/26] x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity_init()

On Mon, Feb 14, 2011 at 3:25 AM, Tejun Heo <tj@...nel.org> wrote:
> 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.

oh, i missed that restore happen first...

sorry.

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