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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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8
kernel/rcu/rcu_segcblist.h
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@@ -22,12 +22,6 @@
#include <linux/rcu_segcblist.h>
/* Is simple callback list empty? */
static inline bool rcu_cblist_empty(struct rcu_cblist *rclp)
{
return !rclp->head;
}
/* Return number of callbacks in simple callback list. */
static inline long rcu_cblist_n_cbs(struct rcu_cblist *rclp)
{
@@ -66,7 +60,7 @@ static inline struct rcu_head *rcu_cblist_head(struct rcu_cblist *rclp)
*/
static inline struct rcu_head **rcu_cblist_tail(struct rcu_cblist *rclp)
{
WARN_ON_ONCE(rcu_cblist_empty(rclp));
WARN_ON_ONCE(!rclp->head);
return rclp->tail;
}