diff options
| author | Gregory Price <gourry@gourry.net> | 2026-07-12 11:44:58 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-08-06 18:56:59 -0700 |
| commit | 7e00a85f783e33ce6106891d6e3ad3c0fd77668f (patch) | |
| tree | 723fe99fbef1c91c8e3ae9590c978c2cab9030a0 /include/linux | |
| parent | 65c1a93e438e42940bdc14b72288f42ca2e3ff06 (diff) | |
mm/memory_hotplug: export mhp_get_default_online_type
Drivers which may pass hotplug policy down to DAX need MMOP_ symbols and
the mhp_get_default_online_type function for hotplug use cases.
Some drivers (cxl) co-mingle their hotplug and devdax use-cases into the
same driver code, and chose the dax_kmem path as the default driver path -
making it difficult to require hotplug as a predicate to building the
overall driver (it may break other non-hotplug use-cases).
Export mhp_get_default_online_type function to allow these drivers to
build when hotplug is disabled and still use the DAX use case.
In the built-out case we simply return MMOP_OFFLINE as it's
non-destructive. The internal function can never return -1 either, so we
choose this to allow for defining the function with 'enum mmop'.
Link: https://lore.kernel.org/20260712154505.3564379-5-gourry@gourry.net
Signed-off-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dan Williams <djbw@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Danilo Krummrich <dakr@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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/memory_hotplug.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 3f5d63892d90..5240aa28bc90 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -317,6 +317,8 @@ extern struct zone *zone_for_pfn_range(enum mmop online_type, extern int arch_create_linear_mapping(int nid, u64 start, u64 size, struct mhp_params *params); void arch_remove_linear_mapping(u64 start, u64 size); +#else +static inline enum mmop mhp_get_default_online_type(void) { return MMOP_OFFLINE; } #endif /* CONFIG_MEMORY_HOTPLUG */ #endif /* __LINUX_MEMORY_HOTPLUG_H */ |