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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-08-02 17:43:50 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:43:55 -0700
commit1331e7a1bbe1f11b19c4327ba0853bee2a606543 (patch)
tree596d9ed379ef7e2c5d8cf1cc0ba56ade084548ec /kernel/rcutree_trace.c
parenta10d206ef1a83121ab7430cb196e0376a7145b22 (diff)
downloadlinaro-lsk-1331e7a1bbe1f11b19c4327ba0853bee2a606543.tar.gz
rcu: Remove _rcu_barrier() dependency on __stop_machine()
Currently, _rcu_barrier() relies on preempt_disable() to prevent any CPU from going offline, which in turn depends on CPU hotplug's use of __stop_machine(). This patch therefore makes _rcu_barrier() use get_online_cpus() to block CPU-hotplug operations. This has the added benefit of removing the need for _rcu_barrier() to adopt callbacks: Because CPU-hotplug operations are excluded, there can be no callbacks to adopt. This commit simplifies the code accordingly. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree_trace.c')
-rw-r--r--kernel/rcutree_trace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index abffb486e94..6a2e52a85d7 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -51,8 +51,8 @@ static int show_rcubarrier(struct seq_file *m, void *unused)
struct rcu_state *rsp;
for_each_rcu_flavor(rsp)
- seq_printf(m, "%s: %c bcc: %d nbd: %lu\n",
- rsp->name, rsp->rcu_barrier_in_progress ? 'B' : '.',
+ seq_printf(m, "%s: bcc: %d nbd: %lu\n",
+ rsp->name,
atomic_read(&rsp->barrier_cpu_count),
rsp->n_barrier_done);
return 0;