Man page 9 : release_mem_region_adjustable

release_mem_region_adjustable - release a previously reserved memory region

int release_mem_region_adjustable(struct resource *  parent , resource_size_t  start , resource_size_t  size );

parent
    parent resource descriptor

start
    resource start address

size
    resource region size

This interface is intended for memory hot-delete. The requested region is released from a currently busy memory resource. The requested region must either match exactly or fit into a single busy resource entry. In the latter case, the remaining resource is adjusted accordingly. Existing children of the busy memory resource must be immutable in the request.

- Additional release conditions, such as overlapping region, can be supported after they are confirmed as valid cases. - When a busy memory resource gets split into two entries, the code assumes that all children remain in the lower address entry for simplicity. Enhance this logic when necessary.