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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-04-08 14:00:03 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-06-15 01:01:39 +0200 |
| commit | 0d95092ccba1a30b74fa52ff94ec5415e63744a0 (patch) | |
| tree | 9476ba20a1ddab23b73d2b3185f323061151d02e /kernel/rcu/tree.c | |
| parent | Linux 4.7-rc2 (diff) | |
| download | linux-0d95092ccba1a30b74fa52ff94ec5415e63744a0.tar.xz linux-0d95092ccba1a30b74fa52ff94ec5415e63744a0.zip | |
rcu: Fix outdated rcu_scheduler_active comment
The comment header for rcu_scheduler_active states that it is used
to optimize synchronize_sched() at early boot. This is incorrect.
The synchronize_sched() function instead checks the number of online
CPUs. This commit therefore replaces the comment's synchronize_sched()
with synchronize_rcu(), which really does use rcu_scheduler_active for
this purpose.
Reported-by: Lihao Liang <lihao.liang@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c7f1bc4f817c..0fa692f1094e 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -130,7 +130,7 @@ int rcu_num_nodes __read_mostly = NUM_RCU_NODES; /* Total # rcu_nodes in use. */ * The rcu_scheduler_active variable transitions from zero to one just * before the first task is spawned. So when this variable is zero, RCU * can assume that there is but one task, allowing RCU to (for example) - * optimize synchronize_sched() to a simple barrier(). When this variable + * optimize synchronize_rcu() to a simple barrier(). When this variable * is one, RCU must actually do all the hard work required to detect real * grace periods. This variable is also used to suppress boot-time false * positives from lockdep-RCU error checking. |