On 14/11/13 07:26, Dario Faggioli wrote:
> On mer, 2013-11-13 at 22:36 -0500, Elena Ufimtseva wrote:
>> + /*
>> + * Set the "dummy" node and exit without error so Linux
>> + * will not try any NUMA init functions which might break
>> + * guests in the future. This will discard all previous
>> + * settings.
>> + */
> IIRC, it's more something that was already happening (the breakage, I
> mean), than a "safety net" for the unforeseeable future. Might be worth
> giving some context about it, perhaps referencing the email thread or
> the git commit hash in the comment.
Yes, a comment like:
/*
* Set a dummy node and return success. This prevents calling any
* hardware-specific initializers which do not work in a PV guest.
*/
is better. No need to refer to any specific threads. It's pretty clear
that any hardware-specific init isn't appropriate for a PV guest.
>> + if (rc != 0) {
>> + for (i = 0; i < MAX_LOCAL_APIC; i++)
>> + set_apicid_to_node(i, NUMA_NO_NODE);
>> + nodes_clear(numa_nodes_parsed);
>> + nodes_clear(node_possible_map);
>> + nodes_clear(node_online_map);
>> + node_set(0, numa_nodes_parsed);
>> + numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
>> + }
>> + return 0;
>>
> Ok, so, we always return 'success', as we were saying during last round.
> However, we do not call dummy_numa_init() directly, and instead we do
> all these stuff, with the last two statements being exactly what
> dummy_numa_init() does. Reason is linking, i.e., the fact that
> dummy_numa_init() is not exported and you can't reach it from here,
> right?
I think this bit is fine as-is.
David
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