Re: [PATCH v2] drivers/base/memory: make memory block get/put explicit

[Mike Rapoport <rppt@kernel.org>]

On Tue, May 12, 2026 at 03:26:35PM +0800, Muchun Song wrote:
> Rename the memory block lookup helper to make the acquired reference
> explicit, add memory_block_put() to wrap put_device(), remove
> find_memory_block(), and use memory_block_get() as the single block-id
> based lookup interface.
> 
> This makes it clearer to callers that a successful lookup holds a
> reference that must be dropped, reducing the chance of forgetting the
> matching put and leaking the memory block device reference.
> 
> Link: https://lore.kernel.org/linux-mm/7887915D-E598-42B3-9AFE-BFFBACE8DE2D@linux.dev/#t
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> Acked-by: Oscar Salvador <osalvador@suse.de>
> Acked-by: David Hildenbrand (Arm) <david@kernel.org>
> Acked-by: Michal Hocko <mhocko@suse.com>
> Tested-by: Donet Tom <donettom@linux.ibm.com>
> Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

> ---
> Changes in v2:
> - mention the removal of find_memory_block() in the commit message
> - drop the redundant extern from the memory_block_get() declaration
> ---
>  .../platforms/pseries/hotplug-memory.c        | 14 ++-----
>  drivers/base/memory.c                         | 38 +++++++------------
>  drivers/base/node.c                           |  4 +-
>  drivers/s390/char/sclp_mem.c                  | 17 ++++-----
>  include/linux/memory.h                        |  7 +++-
>  mm/memory_hotplug.c                           |  5 +--
>  6 files changed, 35 insertions(+), 50 deletions(-)

-- 
Sincerely yours,
Mike.