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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 <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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3
kernel/rcutree.h
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@ -314,6 +314,9 @@ struct rcu_data {
unsigned long n_rp_need_fqs;
unsigned long n_rp_need_nothing;
/* 6) _rcu_barrier() callback. */
struct rcu_head barrier_head;
int cpu;
struct rcu_state *rsp;
};