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SubjectRe: [PATCH v10 2/6] x86: Support Generic Initiator only proximity domains
On Fri, Sep 25, 2020 at 12:32:26PM +0100, Jonathan Cameron wrote:
> I don't think we can. This is doing the same operation as
> is done for memoryless cpu nodes in the init_cpu_to_node() call above
> so it would make little sense from a code flow point of view, even if
> it were possible. However it isn't possible as far as I can see.
>
> It is called after init_cpu_to_node() because...
> * A GI node may also be a CPU node and / or a Memory Node, but we only
> have to do anything extra if it has neither of these.
> Easiest way to do that is use the same logic init_cpu_to_node()
> does and rely on ordering wrt to the other two types of nodes that
> have already been handled. We could have could just call it at the
> end of init_cpu_to_node() but I'd not be happy doing so without renaming
> that function and then we'd end up with a horrible name like
> init_cpu_to_node_and_gi() as they are rather different things.
>
> It needs to happen before use is made of the node_data which is allocated
> in init_gi_nodes() / init_memoryless_node() / alloc_node_data()

Let's put the gist of this requirement in the comment above
init_gi_nodes() for future reference.

...

> It might be possible to allocate the zonelists for this special case later
> in the boot flow, but it seems like we would be adding a lot of complexity
> to avoid a single function call.

Nah, probably not worth the hassle.

> How about this?
>
> +/*
> + * A node may exist which has one or more Generic Initiators but no
> + * CPUs and no memory.
> + * When this function is called, any nodes containing either memory
> + * and/or CPUs will already be online and there is no need to do
> + * anything extra, even if they also contain one or more Generic
> + * Initiators.
> + */

Yes, along with the above gist.

Thx!

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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