'\" t
.\"     Title: release_mem_region_adjustable
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Hardware Interfaces
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "RELEASE_MEM_REGION_A" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Hardware Interfaces"
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.SH "NAME"
release_mem_region_adjustable \- release a previously reserved memory region
.SH "SYNOPSIS"
.HP \w'int\ release_mem_region_adjustable('u
.BI "int release_mem_region_adjustable(struct\ resource\ *\ " "parent" ", resource_size_t\ " "start" ", resource_size_t\ " "size" ");"
.SH "ARGUMENTS"
.PP
\fIparent\fR
.RS 4
parent resource descriptor
.RE
.PP
\fIstart\fR
.RS 4
resource start address
.RE
.PP
\fIsize\fR
.RS 4
resource region size
.RE
.SH "DESCRIPTION"
.PP
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\&.
.SH "NOTE"
.PP
\- 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\&.
.SH "COPYRIGHT"
.br