From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
The __rcu_process_callbacks() invokes note_gp_changes() immediately
before invoking rcu_check_quiescent_state(), which conditionally
invokes that same function. This commit therefore eliminates the
call to note_gp_changes() in __rcu_process_callbacks() in favor of
making unconditional to call from rcu_check_quiescent_state() to
note_gp_changes().
Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
---
kernel/rcutree.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 0848341..12094bd 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1694,11 +1694,8 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct
rcu_data *rdp)
static void
rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
{
- /* If there is now a new grace period, record and return. */
- if (rdp->gpnum != rsp->gpnum) {
- note_gp_changes(rsp, rdp);
- return;
- }
+ /* Check for grace-period ends and beginnings. */
+ note_gp_changes(rsp, rdp);
/*
* Does this CPU still need to do its part for current grace period?
@@ -2162,9 +2159,6 @@ __rcu_process_callbacks(struct rcu_state *rsp)
WARN_ON_ONCE(rdp->beenonline == 0);
- /* Handle the end of a grace period that some other CPU ended. */
- note_gp_changes(rsp, rdp);
-
/* Update RCU state based on any recent quiescent states. */
rcu_check_quiescent_state(rsp, rdp);
--
1.8.1.5
--
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