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author | David S. Miller <davem@davemloft.net> | 2009-03-04 23:59:54 -0800 |
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committer | David S. Miller <davem@davemloft.net> | 2009-03-04 23:59:54 -0800 |
commit | 77827a7cf3aa415f8afec6d9d0537dda8de90ef1 (patch) | |
tree | 503ab81e2b997e3625360b380f1cd18f923a6454 /kernel/rcupdate.c | |
parent | 9d40bbda599def1e1d155d7f7dca14fe8744bd2b (diff) | |
parent | 559595a985e106d2fa9f0c79b7f5805453fed593 (diff) | |
download | op-kernel-dev-77827a7cf3aa415f8afec6d9d0537dda8de90ef1.zip op-kernel-dev-77827a7cf3aa415f8afec6d9d0537dda8de90ef1.tar.gz |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'kernel/rcupdate.c')
-rw-r--r-- | kernel/rcupdate.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index d92a76a..cae8a05 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -44,6 +44,7 @@ #include <linux/cpu.h> #include <linux/mutex.h> #include <linux/module.h> +#include <linux/kernel_stat.h> enum rcu_barrier { RCU_BARRIER_STD, @@ -55,6 +56,7 @@ 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; +int rcu_scheduler_active __read_mostly; /* * Awaken the corresponding synchronize_rcu() instance now that a @@ -80,6 +82,10 @@ void wakeme_after_rcu(struct rcu_head *head) void synchronize_rcu(void) { struct rcu_synchronize rcu; + + if (rcu_blocking_is_gp()) + return; + init_completion(&rcu.completion); /* Will wake me after RCU finished. */ call_rcu(&rcu.head, wakeme_after_rcu); @@ -175,3 +181,9 @@ void __init rcu_init(void) __rcu_init(); } +void rcu_scheduler_starting(void) +{ + WARN_ON(num_online_cpus() != 1); + WARN_ON(nr_context_switches() > 0); + rcu_scheduler_active = 1; +} |