---
name: "dma_buf_kunmap"
section: "9"
platform: "linux"
package: "linux-manual-3.16"
version: "3.16.56-1+deb8u1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/dma_buf_kunmap"
---

# dma\_buf\_kunmap(9)

Unmap a page obtained by dma\_buf\_kmap.

## NAME

dma\_buf\_kunmap - Unmap a page obtained by dma\_buf\_kmap.

## SYNOPSIS

**void dma\_buf\_kunmap(struct dma\_buf \*** *dmabuf***, unsigned long** *page\_num***, void \*** *vaddr***);**

## ARGUMENTS

*dmabuf*

\[in\] buffer to unmap page from.

*page\_num*

\[in\] page in PAGE\_SIZE units to unmap.

*vaddr*

\[in\] kernel space pointer obtained from dma\_buf\_kmap.

## DESCRIPTION

This call must always succeed.

## COPYRIGHT