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The state of a memory block should be restricted to values specified in the documentation of the memory hotplug API. However, since the state field in the memory_block struct was defined as an unsigned long, this restriction was not enforced at compile time. With the introduction of the enum memory_block_state, it is now possible to incorporate the desired semantics in the field declaration and enforce these restrictions at compile time. [akpm@linux-foundation.org: fix whitespace, per Randy] Link: https://lkml.kernel.org/r/20251029195617.2210700-3-linux@israelbatista.dev.br Signed-off-by: Israel Batista <linux@israelbatista.dev.br> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Omar Sandoval <osandov@osandov.com> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>