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author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-09-28 21:50:21 -0700 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-10-05 21:02:05 +0200 |
commit | 135c8aea557cf53abe6c8847e286d01442124193 (patch) | |
tree | 82d8ca15e13548749c7770e9a1a7bc6800ebefbb /kernel | |
parent | a0b6c9a78c41dc36732d6e1e90f0f2f57b29816f (diff) | |
download | op-kernel-dev-135c8aea557cf53abe6c8847e286d01442124193.zip op-kernel-dev-135c8aea557cf53abe6c8847e286d01442124193.tar.gz |
rcu: Replace the rcu_barrier enum with pointer to call_rcu*() function
The rcu_barrier enum causes several problems:
(1) you have to define the enum somewhere, and there is no
convenient place,
(2) the difference between TREE_RCU and TREE_PREEMPT_RCU causes
problems when you need to map from rcu_barrier enum to struct
rcu_state,
(3) the switch statement are large, and
(4) TINY_RCU really needs a different rcu_barrier() than do the
treercu implementations.
So replace it with a functionally equivalent but cleaner function
pointer abstraction.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <12541998232366-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/rcupdate.c | 32 |
1 files changed, 10 insertions, 22 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index 4a189ea..e432422 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -53,12 +53,6 @@ struct lockdep_map rcu_lock_map = EXPORT_SYMBOL_GPL(rcu_lock_map); #endif -enum rcu_barrier { - RCU_BARRIER_STD, - RCU_BARRIER_BH, - RCU_BARRIER_SCHED, -}; - static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL}; static atomic_t rcu_barrier_cpu_count; static DEFINE_MUTEX(rcu_barrier_mutex); @@ -184,19 +178,12 @@ static void rcu_barrier_func(void *type) { int cpu = smp_processor_id(); struct rcu_head *head = &per_cpu(rcu_barrier_head, cpu); + void (*call_rcu_func)(struct rcu_head *head, + void (*func)(struct rcu_head *head)); atomic_inc(&rcu_barrier_cpu_count); - switch ((enum rcu_barrier)type) { - case RCU_BARRIER_STD: - call_rcu(head, rcu_barrier_callback); - break; - case RCU_BARRIER_BH: - call_rcu_bh(head, rcu_barrier_callback); - break; - case RCU_BARRIER_SCHED: - call_rcu_sched(head, rcu_barrier_callback); - break; - } + call_rcu_func = type; + call_rcu_func(head, rcu_barrier_callback); } static inline void wait_migrated_callbacks(void) @@ -209,7 +196,8 @@ static inline void wait_migrated_callbacks(void) * Orchestrate the specified type of RCU barrier, waiting for all * RCU callbacks of the specified type to complete. */ -static void _rcu_barrier(enum rcu_barrier type) +static void _rcu_barrier(void (*call_rcu_func)(struct rcu_head *head, + void (*func)(struct rcu_head *head))) { BUG_ON(in_interrupt()); /* Take cpucontrol mutex to protect against CPU hotplug */ @@ -225,7 +213,7 @@ static void _rcu_barrier(enum rcu_barrier type) * early. */ atomic_set(&rcu_barrier_cpu_count, 1); - on_each_cpu(rcu_barrier_func, (void *)type, 1); + on_each_cpu(rcu_barrier_func, (void *)call_rcu_func, 1); if (atomic_dec_and_test(&rcu_barrier_cpu_count)) complete(&rcu_barrier_completion); wait_for_completion(&rcu_barrier_completion); @@ -238,7 +226,7 @@ static void _rcu_barrier(enum rcu_barrier type) */ void rcu_barrier(void) { - _rcu_barrier(RCU_BARRIER_STD); + _rcu_barrier(call_rcu); } EXPORT_SYMBOL_GPL(rcu_barrier); @@ -247,7 +235,7 @@ EXPORT_SYMBOL_GPL(rcu_barrier); */ void rcu_barrier_bh(void) { - _rcu_barrier(RCU_BARRIER_BH); + _rcu_barrier(call_rcu_bh); } EXPORT_SYMBOL_GPL(rcu_barrier_bh); @@ -256,7 +244,7 @@ EXPORT_SYMBOL_GPL(rcu_barrier_bh); */ void rcu_barrier_sched(void) { - _rcu_barrier(RCU_BARRIER_SCHED); + _rcu_barrier(call_rcu_sched); } EXPORT_SYMBOL_GPL(rcu_barrier_sched); |