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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-05-15 09:43:58 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-05-15 11:20:55 -0700
commit986733e01d258c26107f1da9d8d47c718349ad2f (patch)
tree5e0f04a707b8c341f79927ba6fffd0ad55d85c29 /include/linux/rcupdate.h
parent3b7c8108273bed41a2fc04533cc9f2026ff38c8e (diff)
downloadop-kernel-dev-986733e01d258c26107f1da9d8d47c718349ad2f.zip
op-kernel-dev-986733e01d258c26107f1da9d8d47c718349ad2f.tar.gz
[PATCH] RCU: introduce rcu_needs_cpu() interface
With "Paul E. McKenney" <paulmck@us.ibm.com> Introduce rcu_needs_cpu() interface. This can be used to tell if there will be a new rcu batch on a cpu soon by looking at the curlist pointer. This can be used to avoid to enter a tickless idle state where the cpu would miss that a new batch is ready when rcu_start_batch would be called on a different cpu. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 5673008..970284f 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -132,6 +132,7 @@ static inline void rcu_bh_qsctr_inc(int cpu)
}
extern int rcu_pending(int cpu);
+extern int rcu_needs_cpu(int cpu);
/**
* rcu_read_lock - mark the beginning of an RCU read-side critical section.
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