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| author | Zhouyi Zhou <zhouzhouyi@gmail.com> | 2018-10-08 06:50:41 +0000 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-11-12 09:03:59 -0800 |
| commit | 2320bda26df75c02f86c9fa42c3355ebcd16d8ed (patch) | |
| tree | cac71cbeb4a0df3e7a69ee3e988cebd4f9d2edca /kernel/rcu/tree.c | |
| parent | c669c014d1dae9c7cdbfff049c798722f8650829 (diff) | |
| download | lwn-2320bda26df75c02f86c9fa42c3355ebcd16d8ed.tar.gz lwn-2320bda26df75c02f86c9fa42c3355ebcd16d8ed.zip | |
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/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 6 |
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) { |