---
name: "rcu_idle_exit"
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/rcu_idle_exit"
---

# rcu\_idle\_exit(9)

inform RCU that current CPU is leaving idle

## NAME

rcu\_idle\_exit - inform RCU that current CPU is leaving idle

## SYNOPSIS

**void rcu\_idle\_exit(***void***);**

## ARGUMENTS

*void*

no arguments

## DESCRIPTION

Exit idle mode, in other words, -enter- the mode in which RCU read-side critical sections can occur.

We crowbar the -\>dynticks\_nesting field to DYNTICK\_TASK\_NEST to allow for the possibility of usermode upcalls messing up our count of interrupt nesting level during the busy period that is just now starting.

## COPYRIGHT