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rcu: Open-code the rcu_cblist_empty() function

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Because the rcu_cblist_empty() just samples the ->head pointer, and
because the rcu_cblist structure is quite straightforward, it makes
sense to open-code rcu_cblist_empty(p) as !p->head, 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 08:18:40 -07:00
parent 98059b9861
commit 8ef0f37efb
3 changed files with 7 additions and 14 deletions
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4
kernel/rcu/tree_plugin.h
View file

@ -1942,12 +1942,12 @@ static bool __maybe_unused rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp,
return false;
/* First, enqueue the donelist, if any. This preserves CB ordering. */
if (!rcu_cblist_empty(&rsp->orphan_done)) {
if (rsp->orphan_done.head) {
__call_rcu_nocb_enqueue(rdp, rcu_cblist_head(&rsp->orphan_done),
rcu_cblist_tail(&rsp->orphan_done),
ql, qll, flags);
}
if (!rcu_cblist_empty(&rsp->orphan_pend)) {
if (rsp->orphan_pend.head) {
__call_rcu_nocb_enqueue(rdp, rcu_cblist_head(&rsp->orphan_pend),
rcu_cblist_tail(&rsp->orphan_pend),
ql, qll, flags);