aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/rcutree.h
diff options
context:
space:
mode:
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-11-02 13:52:27 -0800
committerIngo Molnar <mingo@elte.hu>2009-11-10 04:11:17 +0100
commit281d150c5f8892f158747594ab49ce2823fd8b8c (patch)
treee46ed3e84545ec33f99f58f4b7211121bbfe3755 /kernel/rcutree.h
parent7e1a2766e67a529f62c8cfba0a47d63fc4f7fa8a (diff)
rcu: Prepare for synchronization fixes: clean up for non-NO_HZ handling of ->completed counter
Impose a clear locking design on non-NO_HZ handling of the ->completed counter. This increases the distance between the RCU and the CPU-hotplug mechanisms. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca 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 Cc: <stable@kernel.org> # .32.x LKML-Reference: <12571987491353-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree.h')
-rw-r--r--kernel/rcutree.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 1899023b0962..8a4c1650ad8d 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -204,11 +204,12 @@ struct rcu_data {
#define RCU_GP_IDLE 0 /* No grace period in progress. */
#define RCU_GP_INIT 1 /* Grace period being initialized. */
#define RCU_SAVE_DYNTICK 2 /* Need to scan dyntick state. */
-#define RCU_FORCE_QS 3 /* Need to force quiescent state. */
+#define RCU_SAVE_COMPLETED 3 /* Need to save rsp->completed. */
+#define RCU_FORCE_QS 4 /* Need to force quiescent state. */
#ifdef CONFIG_NO_HZ
#define RCU_SIGNAL_INIT RCU_SAVE_DYNTICK
#else /* #ifdef CONFIG_NO_HZ */
-#define RCU_SIGNAL_INIT RCU_FORCE_QS
+#define RCU_SIGNAL_INIT RCU_SAVE_COMPLETED
#endif /* #else #ifdef CONFIG_NO_HZ */
#define RCU_JIFFIES_TILL_FORCE_QS 3 /* for rsp->jiffies_force_qs */
@@ -274,9 +275,8 @@ struct rcu_state {
unsigned long jiffies_stall; /* Time at which to check */
/* for CPU stalls. */
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
-#ifdef CONFIG_NO_HZ
long dynticks_completed; /* Value of completed @ snap. */
-#endif /* #ifdef CONFIG_NO_HZ */
+ /* Protected by fqslock. */
};
#ifdef RCU_TREE_NONCORE

Privacy Policy