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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-05-29 03:03:37 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-07-02 12:33:22 -0700
commit7db74df88b52844f4e966901e2972bba725e6766 (patch)
treeccb2139d2c4628591287bf456ede1164cef43d0f /kernel/rcutree.c
parent24ebbca8ecdd5129d7f829a7cb5146aaeb531f77 (diff)
downloadop-kernel-dev-7db74df88b52844f4e966901e2972bba725e6766.zip
op-kernel-dev-7db74df88b52844f4e966901e2972bba725e6766.tar.gz
rcu: Move rcu_barrier_completion to rcu_state structure
In order to allow each RCU flavor to concurrently execute its rcu_barrier() function, it is necessary to move the relevant state to the rcu_state structure. This commit therefore moves the rcu_barrier_completion global variable to a new ->barrier_completion field in the rcu_state structure. 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.c')
-rw-r--r--kernel/rcutree.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 5929b02..ca7d167 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -158,7 +158,6 @@ unsigned long rcutorture_vernum;
/* State information for rcu_barrier() and friends. */
static DEFINE_MUTEX(rcu_barrier_mutex);
-static struct completion rcu_barrier_completion;
/*
* Return true if an RCU grace period is in progress. The ACCESS_ONCE()s
@@ -2275,7 +2274,7 @@ static void rcu_barrier_callback(struct rcu_head *rhp)
struct rcu_state *rsp = rdp->rsp;
if (atomic_dec_and_test(&rsp->barrier_cpu_count))
- complete(&rcu_barrier_completion);
+ complete(&rsp->barrier_completion);
}
/*
@@ -2325,7 +2324,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
* 6. Both rcu_barrier_callback() callbacks are invoked, awakening
* us -- but before CPU 1's orphaned callbacks are invoked!!!
*/
- init_completion(&rcu_barrier_completion);
+ init_completion(&rsp->barrier_completion);
atomic_set(&rsp->barrier_cpu_count, 1);
raw_spin_lock_irqsave(&rsp->onofflock, flags);
rsp->rcu_barrier_in_progress = current;
@@ -2375,10 +2374,10 @@ static void _rcu_barrier(struct rcu_state *rsp)
* CPU, and thus each counted, remove the initial count.
*/
if (atomic_dec_and_test(&rsp->barrier_cpu_count))
- complete(&rcu_barrier_completion);
+ complete(&rsp->barrier_completion);
/* Wait for all rcu_barrier_callback() callbacks to be invoked. */
- wait_for_completion(&rcu_barrier_completion);
+ wait_for_completion(&rsp->barrier_completion);
/* Other rcu_barrier() invocations can now safely proceed. */
mutex_unlock(&rcu_barrier_mutex);
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