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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-05-29 05:18:53 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 12:33:22 -0700 |
| commit | 7be7f0be907224445acc62b3884c892f38b7ff40 (patch) | |
| tree | 9802c524d04374e6a4e5c5b9d3a0d3c9085ef2fd /kernel/rcutree.c | |
| parent | 7db74df88b52844f4e966901e2972bba725e6766 (diff) | |
| download | linux-7be7f0be907224445acc62b3884c892f38b7ff40.tar.gz linux-7be7f0be907224445acc62b3884c892f38b7ff40.tar.bz2 linux-7be7f0be907224445acc62b3884c892f38b7ff40.zip | |
rcu: Move rcu_barrier_mutex 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_mutex global variable to a new ->barrier_mutex 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>
Diffstat (limited to 'kernel/rcutree.c')
| -rw-r--r-- | kernel/rcutree.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index ca7d1678ac79..ff992ac24e73 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -71,6 +71,7 @@ static struct lock_class_key rcu_node_class[RCU_NUM_LVLS]; .onofflock = __RAW_SPIN_LOCK_UNLOCKED(&sname##_state.onofflock), \ .orphan_nxttail = &sname##_state.orphan_nxtlist, \ .orphan_donetail = &sname##_state.orphan_donelist, \ + .barrier_mutex = __MUTEX_INITIALIZER(sname##_state.barrier_mutex), \ .fqslock = __RAW_SPIN_LOCK_UNLOCKED(&sname##_state.fqslock), \ .n_force_qs = 0, \ .n_force_qs_ngp = 0, \ @@ -155,10 +156,6 @@ static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp); unsigned long rcutorture_testseq; unsigned long rcutorture_vernum; -/* State information for rcu_barrier() and friends. */ - -static DEFINE_MUTEX(rcu_barrier_mutex); - /* * Return true if an RCU grace period is in progress. The ACCESS_ONCE()s * permit this function to be invoked without holding the root rcu_node @@ -2303,7 +2300,7 @@ static void _rcu_barrier(struct rcu_state *rsp) init_rcu_head_on_stack(&rd.barrier_head); /* Take mutex to serialize concurrent rcu_barrier() requests. */ - mutex_lock(&rcu_barrier_mutex); + mutex_lock(&rsp->barrier_mutex); smp_mb(); /* Prevent any prior operations from leaking in. */ @@ -2380,7 +2377,7 @@ static void _rcu_barrier(struct rcu_state *rsp) wait_for_completion(&rsp->barrier_completion); /* Other rcu_barrier() invocations can now safely proceed. */ - mutex_unlock(&rcu_barrier_mutex); + mutex_unlock(&rsp->barrier_mutex); destroy_rcu_head_on_stack(&rd.barrier_head); } |