linux-kernel - Re: [PATCH v2 3/7] mm/memory_hotplug: prepare passing flags to add

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Date:   Wed, 9 Sep 2020 09:17:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-hyperv@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-acpi@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-s390@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Liu <wei.liu@...nel.org>, Michal Hocko <mhocko@...e.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Baoquan He <bhe@...hat.com>,
        Wei Yang <richardw.yang@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
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        Stefano Stabellini <sstabellini@...nel.org>,
        Oliver O'Halloran <oohall@...il.com>,
        Pingfan Liu <kernelfans@...il.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Libor Pechacek <lpechacek@...e.cz>,
        Anton Blanchard <anton@...abs.org>,
        Leonardo Bras <leobras.c@...il.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 3/7] mm/memory_hotplug: prepare passing flags to
 add_memory() and friends

On Tue, Sep 08, 2020 at 10:10:08PM +0200, David Hildenbrand wrote:
> We soon want to pass flags, e.g., to mark added System RAM resources.
> mergeable. Prepare for that.

What are these random "flags", and how do we know what should be passed
to them?

Why not make this an enumerated type so that we know it all works
properly, like the GPF_* flags are?  Passing around a random unsigned
long feels very odd/broken...

thanks,

greg k-h