dax/kmem: extract hotplug/hotremove helper functions

Refactor kmem _probe() _remove() by extracting init, cleanup, hotplug, and
hot-remove logic into separate helper functions:

  - dax_kmem_init_resources: inits IO_RESOURCE w/ request_mem_region
  - dax_kmem_cleanup_resources: cleans up initialized IO_RESOURCE
  - dax_kmem_do_hotplug: handles memory region reservation and adding
  - dax_kmem_do_hotremove: handles memory removal and resource cleanup

This is a pure refactoring with no functional change.  The helpers will
enable future extensions to support more granular control over memory
hotplug operations.

We need to split hotplug/hotunplug and init/cleanup in order to have the
resources available for hot-add.  Otherwise, when probe occurs, the dax
devices are never added to sysfs because the resources are never
registered.

Detaching hotunplug/cleanup allows us to re-use the hotunplug code without
destroying the underlying resources.

Link: https://lore.kernel.org/20260712154505.3564379-9-gourry@gourry.net
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Gregory Price <gourry@gourry.net>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pankaj Gupta <pankaj.gupta@amd.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions