rcu: Open-code the rcu_cblist_n_lazy_cbs() function

Because the rcu_cblist_n_lazy_cbs() just samples the ->len_lazy counter,
and because the rcu_cblist structure is quite straightforward, it makes
sense to open-code rcu_cblist_n_lazy_cbs(p) as p->len_lazy, cutting out
a level of indirection.  This commit makes this change.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/rcu/rcu_segcblist.h b/kernel/rcu/rcu_segcblist.h
index 424a6b2..6e36e36 100644 (file)
--- a/kernel/rcu/rcu_segcblist.h
+++ b/kernel/rcu/rcu_segcblist.h
@@ -22,12 +22,6 @@
 
 #include <linux/rcu_segcblist.h>
 
-/* Return number of lazy callbacks in simple callback list. */
-static inline long rcu_cblist_n_lazy_cbs(struct rcu_cblist *rclp)
-{
-       return rclp->len_lazy;
-}
-
 /*
  * Account for the fact that a previously dequeued callback turned out
  * to be marked as lazy.

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 942d529..1205c8a 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2634,7 +2634,7 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp, unsigned long flags)
 
        /* Do the accounting first. */
        rdp->n_cbs_adopted += rsp->orphan_done.len;
-       if (rcu_cblist_n_lazy_cbs(&rsp->orphan_done) != rsp->orphan_done.len)
+       if (rsp->orphan_done.len_lazy != rsp->orphan_done.len)
                rcu_idle_count_callbacks_posted();
        rcu_segcblist_insert_count(&rdp->cblist, &rsp->orphan_done);
 

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 7ebe357..c9a4865 100644 (file)
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1935,7 +1935,7 @@ static bool __maybe_unused rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp,
                                                     unsigned long flags)
 {
        long ql = rsp->orphan_done.len;
-       long qll = rcu_cblist_n_lazy_cbs(&rsp->orphan_done);
+       long qll = rsp->orphan_done.len_lazy;
 
        /* If this is not a no-CBs CPU, tell the caller to do it the old way. */
        if (!rcu_is_nocb_cpu(smp_processor_id()))

diff --git a/kernel/rcu/tree_trace.c b/kernel/rcu/tree_trace.c
index b7743aa..6cea17a 100644 (file)
--- a/kernel/rcu/tree_trace.c
+++ b/kernel/rcu/tree_trace.c
@@ -277,7 +277,7 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
                   rsp->n_force_qs, rsp->n_force_qs_ngp,
                   rsp->n_force_qs - rsp->n_force_qs_ngp,
                   READ_ONCE(rsp->n_force_qs_lh),
-                  rcu_cblist_n_lazy_cbs(&rsp->orphan_done),
+                  rsp->orphan_done.len_lazy,
                   rsp->orphan_done.len);
        for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
                if (rnp->level != level) {