rcu_idle_exit
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## 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.

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