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rcu: Move _rcu_barrier()'s rcu_head structures to rcu_data structures

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In order for multiple flavors of RCU to each concurrently run one
rcu_barrier(), each flavor needs its own per-CPU set of rcu_head
structures.  This commit therefore moves _rcu_barrier()'s set of
per-CPU rcu_head structures from per-CPU variables to the existing
per-CPU and per-RCU-flavor rcu_data structures.

Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
This commit is contained in:
Paul E. McKenney 2012-05-28 23:57:46 -07:00 • committed by Paul E. McKenney
commit 06668efa91
2 changed files with 5 additions and 4 deletions
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6
kernel/rcutree.c
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@ -157,7 +157,6 @@ unsigned long rcutorture_vernum;
/* State information for rcu_barrier() and friends. */
static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL};
static atomic_t rcu_barrier_cpu_count;
static DEFINE_MUTEX(rcu_barrier_mutex);
static struct completion rcu_barrier_completion;
@ -2282,12 +2281,11 @@ static void rcu_barrier_callback(struct rcu_head *notused)
*/
static void rcu_barrier_func(void *type)
{
int cpu = smp_processor_id();
struct rcu_head *head = &per_cpu(rcu_barrier_head, cpu);
struct rcu_state *rsp = type;
struct rcu_data *rdp = __this_cpu_ptr(rsp->rda);
atomic_inc(&rcu_barrier_cpu_count);
rsp->call(head, rcu_barrier_callback);
rsp->call(&rdp->barrier_head, rcu_barrier_callback);
}
/*