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b=M6z5tz8kY/PU01R6WlDxuIBLJ/bJKpoQAnN5/1qbP5spDN/iPHFfPzBLX8mkV9DDA G3DkT5bVzg5U94Px2HUhWXhaFgUi7LQGLGjQ1MGNP2Hg7lQ00dASwHNXXyav63gc+O QJw4wroV76SWun3igUHrJLnRhHd5ncUMOZRcUV7H57gEbsMQRAPHz0ozkufzm0xY7j GLOQM9DkBLKmLeoBhWTfOczfcajffXg2kORKsS/ddCSJDfF4e+5gR9FvsqS1/3omX0 fLaDhmGnEfXD2Oms09iM24cDcFoNNVmfzLMASw49qqzsjfZ+0MssJoXaRE3ZQseoyK oYUbhyfDTuhEA== Message-ID: Date: Mon, 13 Apr 2026 17:21:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/8] mm/memory_hotplug: add __add_memory_driver_managed() with online_type arg To: Gregory Price , linux-mm@kvack.org, vishal.l.verma@intel.com, dave.jiang@intel.com, akpm@linux-foundation.org, osalvador@suse.de Cc: dan.j.williams@intel.com, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, kernel-team@meta.com References: <20260321150404.3288786-1-gourry@gourry.net> <20260321150404.3288786-6-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 9DC9240002 X-Stat-Signature: 5hp4rcsfure1hhiqk4jsofktbb4jsbt6 X-Rspamd-Server: rspam06 X-HE-Tag: 1776093679-186604 X-HE-Meta: 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 hQnQeyGx fIBsRLLI50DPjaurWyttXV5w2oXRSekxALDGdgae/EsQzDagW9jVsMGwpbamNCRGaVpu1KNf4a0PXqwm9yd+GrPvTVlMSEFVPVqG5TC8EL+CSaC6YbJKEKNZG5QJtfRxHkJLe6Xb4OJOOW5BmLNXAPUr+qgkYnSSxLhwQ9hWl/PTJTbbsPcY37Hul9CdP7x5JFssnrfCuNHJJWwf2dBAARSYwo0WAuUlcHfgU523jEAtY8dzLh68yndAWnUsZukOOtJgCz04NpU3Lxd2NfIlvUXKCBbzTwY2hmfNOYoB31yIWTvZ6pkQhFOryDNB3r0JkIv4h/E67o9sDFZ8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/21/26 16:04, Gregory Price wrote: > Existing callers of add_memory_driver_managed cannot select the > preferred online type (ZONE_NORMAL vs ZONE_MOVABLE), requiring it to > hot-add memory as offline blocks, and then follow up by onlining each > memory block individually. > > Most drivers prefer the system default, but the CXL driver wants to > plumb a preferred policy through the dax kmem driver. > > Refactor APIs to add a new interface which allows the dax kmem and > cxl_core modules to select a preferred policy. Only expose this > interface to those modules to avoid confusion among existing API users > and to limit usage in out-of-tree modules. > > Refactor add_memory_driver_managed, extract __add_memory_driver_managed > - Add proper kernel-doc for add_memory_driver_managed while refactoring > - New helper accepts an explicit online_type. > - New help validates online_type is between OFFLINE and ONLINE_MOVABLE > > Refactor: add_memory_resource, extract __add_memory_resource > - new helper accepts an explicit online_type > > Original APIs now explicitly pass the system-default to new helpers. > > No functional change for existing users. > You should add here, that we only allow known in-tree modules to overwrite the onlining policy (where we know that it's a different user-requested policy), as we don't want arbitrary OOT drivers to overwrite the configured system policy. Therefore EXPORT_SYMBOL_FOR_MODULES(). Acked-by: David Hildenbrand (Arm) -- Cheers, David