linux-kernel - Re: [PATCH 4/8] mm/memory_hotplug: return online type from add_memory_driver

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Message-ID: <6a9db6ff-2fe8-4be6-baba-7db7913898f2@kernel.org>
Date: Wed, 14 Jan 2026 11:49:19 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Gregory Price <gourry@...rry.net>, linux-mm@...ck.org
Cc: linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
 linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
 kernel-team@...a.com, dan.j.williams@...el.com, vishal.l.verma@...el.com,
 dave.jiang@...el.com, mst@...hat.com, jasowang@...hat.com,
 xuanzhuo@...ux.alibaba.com, eperezma@...hat.com, osalvador@...e.de,
 akpm@...ux-foundation.org
Subject: Re: [PATCH 4/8] mm/memory_hotplug: return online type from
 add_memory_driver_managed()

On 1/14/26 09:51, Gregory Price wrote:
> Change add_memory_driver_managed() to return the online type (MMOP_*)
> on success instead of 0. This allows callers to determine the actual
> online state of the memory after addition, which is important when
> MMOP_SYSTEM_DEFAULT is used and the actual online type depends on the
> system default policy.

Another reason to just let the caller handle MMOP_SYSTEM_DEFAULT itself 
by calling mhp_get_default_online_type() :)

-- 
Cheers

David