summaryrefslogtreecommitdiff
path: root/kernel/rcu
diff options
context:
space:
mode:
authorZhouyi Zhou <zhouzhouyi@gmail.com>2018-10-08 06:50:41 +0000
committerPaul E. McKenney <paulmck@linux.ibm.com>2018-11-12 09:03:59 -0800
commit2320bda26df75c02f86c9fa42c3355ebcd16d8ed (patch)
treecac71cbeb4a0df3e7a69ee3e988cebd4f9d2edca /kernel/rcu
parentc669c014d1dae9c7cdbfff049c798722f8650829 (diff)
rcu: Adjust the comment of function rcu_is_watching
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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e7c9848d1e1b..429a46fb087a 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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)
{