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RELEASE_MEM_REGION_A(9) Hardware Interfaces RELEASE_MEM_REGION_A(9)

NAME

release_mem_region_adjustable - release a previously reserved memory region

SYNOPSIS

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

ARGUMENTS

parent

parent resource descriptor

start

resource start address

size

resource region size

DESCRIPTION

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.

NOTE

- 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.

COPYRIGHT

March 2017 Kernel Hackers Manual 4.10