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authorSteven Rostedt <rostedt@goodmis.org>2008-02-29 18:46:50 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-29 18:46:50 +0100
commit2232c2d8e0a6a31061dec311f3d1cf7624bc14f1 (patch)
tree1d90ec0b8bd4e3c154e386f005ef596ee25fa53f /include/linux/rcuclassic.h
parentc0f4133b8f70769bc8dda977feb9a29109d6ccca (diff)
rcu: add support for dynamic ticks and preempt rcu
The PREEMPT-RCU can get stuck if a CPU goes idle and NO_HZ is set. The idle CPU will not progress the RCU through its grace period and a synchronize_rcu my get stuck. Without this patch I have a box that will not boot when PREEMPT_RCU and NO_HZ are set. That same box boots fine with this patch. This patch comes from the -rt kernel where it has been tested for several months. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/rcuclassic.h')
-rw-r--r--include/linux/rcuclassic.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rcuclassic.h b/include/linux/rcuclassic.h
index 4d6624260b4c..b3dccd68629e 100644
--- a/include/linux/rcuclassic.h
+++ b/include/linux/rcuclassic.h
@@ -160,5 +160,8 @@ extern void rcu_restart_cpu(int cpu);
extern long rcu_batches_completed(void);
extern long rcu_batches_completed_bh(void);
+#define rcu_enter_nohz() do { } while (0)
+#define rcu_exit_nohz() do { } while (0)
+
#endif /* __KERNEL__ */
#endif /* __LINUX_RCUCLASSIC_H */