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rcu: Adjust the comment of function rcu_is_watching

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Because RCU avoids interrupting idle CPUs, rcu_is_watching() is used to
test whether or not it is currently legal to run RCU read-side critical
sections on this CPU.  However, the first sentence and last sentences
of current comment for rcu_is_watching have opposite meaning of what
is expected.  This commit therefore fixes this header comment.

Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Zhouyi Zhou 2018-10-08 06:50:41 +00:00 committed by Paul E. McKenney
parent c669c014d1
commit 2320bda26d
1 changed files with 3 additions and 3 deletions
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6
kernel/rcu/tree.c
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@ -904,12 +904,12 @@ void rcu_irq_enter_irqson(void)
}
/**
* rcu_is_watching - see if RCU thinks that the current CPU is idle
* rcu_is_watching - see if RCU thinks that the current CPU is not idle
*
* Return true if RCU is watching the running CPU, which means that this
* CPU can safely enter RCU read-side critical sections. In other words,
* if the current CPU is in its idle loop and is neither in an interrupt
* or NMI handler, return true.
* if the current CPU is not in its idle loop or is in an interrupt or
* NMI handler, return true.
*/
bool notrace rcu_is_watching(void)
{