Commit-ID: 4b27f20b40a23f03df682eb1f69e9dc3da7d3b93
Gitweb: http://git.kernel.org/tip/4b27f20b40a23f03df682eb1f69e9dc3da7d3b93
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Tue, 2 May 2017 08:45:25 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 2 May 2017 09:21:59 -0700
rcu: Open-code the rcu_cblist_n_cbs() function
Because the rcu_cblist_n_cbs() just samples the ->len counter, and
because the rcu_cblist structure is quite straightforward, it makes
sense to open-code rcu_cblist_n_cbs(p) as p->len, cutting out a level
of indirection. This commit makes this change.
Reported-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
kernel/rcu/rcu_segcblist.h | 6 ------
kernel/rcu/tree.c | 9 ++++-----
kernel/rcu/tree_plugin.h | 2 +-
kernel/rcu/tree_trace.c | 2 +-
4 files changed, 6 insertions(+), 13 deletions(-)
diff --git a/kernel/rcu/rcu_segcblist.h b/kernel/rcu/rcu_segcblist.h
index 7d18d41..424a6b2 100644
--- a/kernel/rcu/rcu_segcblist.h
+++ b/kernel/rcu/rcu_segcblist.h
@@ -22,12 +22,6 @@
#include <linux/rcu_segcblist.h>
-/* Return number of callbacks in simple callback list. */
-static inline long rcu_cblist_n_cbs(struct rcu_cblist *rclp)
-{
- return rclp->len;
-}
-
/* Return number of lazy callbacks in simple callback list. */
static inline long rcu_cblist_n_lazy_cbs(struct rcu_cblist *rclp)
{
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 3515241..942d529 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2633,9 +2633,8 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp, unsigned long flags)
return;
/* Do the accounting first. */
- rdp->n_cbs_adopted += rcu_cblist_n_cbs(&rsp->orphan_done);
- if (rcu_cblist_n_lazy_cbs(&rsp->orphan_done) !=
- rcu_cblist_n_cbs(&rsp->orphan_done))
+ rdp->n_cbs_adopted += rsp->orphan_done.len;
+ if (rcu_cblist_n_lazy_cbs(&rsp->orphan_done) != rsp->orphan_done.len)
rcu_idle_count_callbacks_posted();
rcu_segcblist_insert_count(&rdp->cblist, &rsp->orphan_done);
@@ -2792,14 +2791,14 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
* Stop only if limit reached and CPU has something to do.
* Note: The rcl structure counts down from zero.
*/
- if (-rcu_cblist_n_cbs(&rcl) >= bl &&
+ if (-rcl.len >= bl &&
(need_resched() ||
(!is_idle_task(current) && !rcu_is_callbacks_kthread())))
break;
}
local_irq_save(flags);
- count = -rcu_cblist_n_cbs(&rcl);
+ count = -rcl.len;
trace_rcu_batch_end(rsp->name, count, !!rcl.head, need_resched(),
is_idle_task(current), rcu_is_callbacks_kthread());
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 6b4b1f8..7ebe357 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1934,7 +1934,7 @@ static bool __maybe_unused rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp,
struct rcu_data *rdp,
unsigned long flags)
{
- long ql = rcu_cblist_n_cbs(&rsp->orphan_done);
+ long ql = rsp->orphan_done.len;
long qll = rcu_cblist_n_lazy_cbs(&rsp->orphan_done);
/* If this is not a no-CBs CPU, tell the caller to do it the old way. */
diff --git a/kernel/rcu/tree_trace.c b/kernel/rcu/tree_trace.c
index 30c5bf8..b7743aa 100644
--- a/kernel/rcu/tree_trace.c
+++ b/kernel/rcu/tree_trace.c
@@ -278,7 +278,7 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
rsp->n_force_qs - rsp->n_force_qs_ngp,
READ_ONCE(rsp->n_force_qs_lh),
rcu_cblist_n_lazy_cbs(&rsp->orphan_done),
- rcu_cblist_n_cbs(&rsp->orphan_done));
+ rsp->orphan_done.len);
for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
if (rnp->level != level) {
seq_puts(m, "\n");
--
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