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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-08-11 01:28:53 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-08-20 20:00:12 +0400
commit53d84e004d5e8c018be395c4330dc72fd60bd13e (patch)
tree6d5b265442ac42c7cc73147b0de0d029644e312b /kernel/rcutree_plugin.h
parent8cdd32a918350430483751feaae1c19cef816f69 (diff)
downloadlinux-53d84e004d5e8c018be395c4330dc72fd60bd13e.tar.xz
rcu: permit suppressing current grace period's CPU stall warnings
When using a kernel debugger, a long sojourn in the debugger can get you lots of RCU CPU stall warnings once you resume. This might not be helpful, especially if you are using the system console. This patch therefore allows RCU CPU stall warnings to be suppressed, but only for the duration of the current set of grace periods. This differs from Jason's original patch in that it adds support for tiny RCU and preemptible RCU, and uses a slightly different method for suppressing the RCU CPU stall warning messages. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 63bb7714fdeb..561410f70d4a 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -417,6 +417,16 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
}
}
+/*
+ * Suppress preemptible RCU's CPU stall warnings by pushing the
+ * time of the next stall-warning message comfortably far into the
+ * future.
+ */
+static void rcu_preempt_stall_reset(void)
+{
+ rcu_preempt_state.jiffies_stall = jiffies + ULONG_MAX / 2;
+}
+
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
/*
@@ -867,6 +877,14 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
{
}
+/*
+ * Because preemptible RCU does not exist, there is no need to suppress
+ * its CPU stall warnings.
+ */
+static void rcu_preempt_stall_reset(void)
+{
+}
+
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
/*