centos man page for rcu_read_lock_bh_held

RCU_READ_LOCK_BH_HEL(9) 					   Driver Basics					   RCU_READ_LOCK_BH_HEL(9)

NAME
       rcu_read_lock_bh_held - might we be in RCU-bh read-side critical section?

SYNOPSIS
       int rcu_read_lock_bh_held(void);

ARGUMENTS
       void
	   no arguments

DESCRIPTION
       Check for bottom half being disabled, which covers both the CONFIG_PROVE_RCU and not cases. Note that if someone uses rcu_read_lock_bh, but
       then later enables BH, lockdep (if enabled) will show the situation. This is useful for debug checks in functions that require that they be
       called within an RCU read-side critical section.

       Check debug_lockdep_rcu_enabled to prevent false positives during boot.

       Note that rcu_read_lock is disallowed if the CPU is either idle or offline from an RCU perspective, so check for those as well.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   RCU_READ_LOCK_BH_HEL(9)