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

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 <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2012-05-28 23:57:46 -07:00 committed by Paul E. McKenney
parent 037b64ed0b
commit 06668efa91
2 changed files with 5 additions and 4 deletions
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6
kernel/rcutree.c
View File

@ -157,7 +157,6 @@ unsigned long rcutorture_vernum;
/* State information for rcu_barrier() and friends. */ /* 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 atomic_t rcu_barrier_cpu_count;
static DEFINE_MUTEX(rcu_barrier_mutex); static DEFINE_MUTEX(rcu_barrier_mutex);
static struct completion rcu_barrier_completion; 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) 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_state *rsp = type;
struct rcu_data *rdp = __this_cpu_ptr(rsp->rda);
atomic_inc(&rcu_barrier_cpu_count); atomic_inc(&rcu_barrier_cpu_count);
rsp->call(head, rcu_barrier_callback); rsp->call(&rdp->barrier_head, rcu_barrier_callback);
} }
/* /*

3
kernel/rcutree.h
View File

@ -314,6 +314,9 @@ struct rcu_data {
unsigned long n_rp_need_fqs; unsigned long n_rp_need_fqs;
unsigned long n_rp_need_nothing; unsigned long n_rp_need_nothing;
/* 6) _rcu_barrier() callback. */
struct rcu_head barrier_head;
int cpu; int cpu;
struct rcu_state *rsp; struct rcu_state *rsp;
}; };