---
name: "spans_boundary"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/spans_boundary"
---

# spans\_boundary(9)

Check a packet can be ISA DMA'd

## NAME

spans\_boundary - Check a packet can be ISA DMA'd

## SYNOPSIS

**int spans\_boundary(struct sk\_buff \*** *skb***);**

## ARGUMENTS

*skb*

The buffer to check

## DESCRIPTION

Returns true if the buffer cross a DMA boundary on a PC. The poor thing can only DMA within a 64K block not across the edges of it.

## AUTHOR

**Alan Cox** \<alan@lxorguk.ukuu.org.uk\>

Author.

## COPYRIGHT