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rcu: Open-code the rcu_cblist_n_lazy_cbs() function

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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>
This commit is contained in:
Paul E. McKenney 2017-05-02 08:48:33 -07:00
parent 4b27f20b40
commit 933dfbd7c4
4 changed files with 3 additions and 9 deletions
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6
kernel/rcu/rcu_segcblist.h
View File

@ -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.

2
kernel/rcu/tree.c
View File

@ -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);

2
kernel/rcu/tree_plugin.h
View File

@ -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()))

2
kernel/rcu/tree_trace.c
View File

@ -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) {