1RELEASE_MEM_REGION_A(9)       Hardware Interfaces      RELEASE_MEM_REGION_A(9)
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NAME

6       release_mem_region_adjustable - release a previously reserved memory
7       region
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SYNOPSIS

10       int release_mem_region_adjustable(struct resource * parent,
11                                         resource_size_t start,
12                                         resource_size_t size);
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ARGUMENTS

15       parent
16           parent resource descriptor
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18       start
19           resource start address
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21       size
22           resource region size
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DESCRIPTION

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

33       - Additional release conditions, such as overlapping region, can be
34       supported after they are confirmed as valid cases. - When a busy memory
35       resource gets split into two entries, the code assumes that all
36       children remain in the lower address entry for simplicity. Enhance this
37       logic when necessary.
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40Kernel Hackers Manual 3.10         June 2019           RELEASE_MEM_REGION_A(9)
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