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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.h
parenta10d206ef1a83121ab7430cb196e0376a7145b22 (diff)
downloadlinux-1331e7a1bbe1f11b19c4327ba0853bee2a606543.tar.bz2
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.h')
-rw-r--r--kernel/rcutree.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 4d29169f2124..94dfdf1f31f5 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -398,9 +398,6 @@ struct rcu_state {
struct rcu_head **orphan_donetail; /* Tail of above. */
long qlen_lazy; /* Number of lazy callbacks. */
long qlen; /* Total number of callbacks. */
- struct task_struct *rcu_barrier_in_progress;
- /* Task doing rcu_barrier(), */
- /* or NULL if no barrier. */
struct mutex barrier_mutex; /* Guards barrier fields. */
atomic_t barrier_cpu_count; /* # CPUs waiting on. */
struct completion barrier_completion; /* Wake at barrier end. */