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Subject: Re: [PATCH V5 1/4] ACPI: Support Generic Initiator only domains
To:     Dan Williams <dan.j.williams@intel.com>,
        Jonathan Cameron <jonathan.cameron@huawei.com>
Cc:     Tao Xu <tao3.xu@intel.com>, Linux MM <linux-mm@kvack.org>,
        Linux ACPI <linux-acpi@vger.kernel.org>,
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        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Linuxarm <linuxarm@huawei.com>,
        Andrew Morton <akpm@linux-foundation.org>
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From:   Brice Goglin <brice.goglin@gmail.com>
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Date:   Mon, 18 Nov 2019 18:18:23 +0100
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Le 16/11/2019 à 21:45, Dan Williams a écrit :
>
>> My feeling is that any existing users of access0 are definitely not going
>> to be expecting generic initiators, so we might want to do this the other
>> way around. access0 is only CPUs and memory, access1 is including
>> generic initiators.  If there are no GIs don't expose access1 at all?
> There are no consumers of the information that I know of, so I do not
> see the risk of regression.


hwloc already reads access0/initiators/ node symlinks (mostly useful for
finding which CPUs are local to kmem dax devices). If I understand
correctly the changes you propose, we would get an empty list of CPUs in
the access0/initiators/ nodes? If it only occurs on platforms with GI
(when are those coming to market?), I'd say it's not a big deal for us,
we'll manage to have users upgrade their hwloc.

Brice