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timerqueue: Let timerqueue_add/del return information

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The hrtimer code is interested whether the added timer is the first
one to expire and whether the removed timer was the last one in the
tree. The add/del routines have that information already. So we can
return it right away instead of reevaluating it at the call site.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20150414203501.579063647@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-04-14 21:08:46 +00:00
parent b8e38413ac
commit c320642e1c
2 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/timerqueue.h
View File

@ -16,10 +16,10 @@ struct timerqueue_head {
}; };
extern void timerqueue_add(struct timerqueue_head *head, extern bool timerqueue_add(struct timerqueue_head *head,
struct timerqueue_node *node); struct timerqueue_node *node);
extern void timerqueue_del(struct timerqueue_head *head, extern bool timerqueue_del(struct timerqueue_head *head,
struct timerqueue_node *node); struct timerqueue_node *node);
extern struct timerqueue_node *timerqueue_iterate_next( extern struct timerqueue_node *timerqueue_iterate_next(
struct timerqueue_node *node); struct timerqueue_node *node);

10
lib/timerqueue.c
View File

@ -36,7 +36,7 @@
* Adds the timer node to the timerqueue, sorted by the * Adds the timer node to the timerqueue, sorted by the
* node's expires value. * node's expires value.
*/ */
void timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node) bool timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node)
{ {
struct rb_node **p = &head->head.rb_node; struct rb_node **p = &head->head.rb_node;
struct rb_node *parent = NULL; struct rb_node *parent = NULL;
@ -56,8 +56,11 @@ void timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node)
rb_link_node(&node->node, parent, p); rb_link_node(&node->node, parent, p);
rb_insert_color(&node->node, &head->head); rb_insert_color(&node->node, &head->head);
if (!head->next || node->expires.tv64 < head->next->expires.tv64) if (!head->next || node->expires.tv64 < head->next->expires.tv64) {
head->next = node; head->next = node;
return true;
}
return false;
} }
EXPORT_SYMBOL_GPL(timerqueue_add); EXPORT_SYMBOL_GPL(timerqueue_add);
@ -69,7 +72,7 @@ EXPORT_SYMBOL_GPL(timerqueue_add);
* *
* Removes the timer node from the timerqueue. * Removes the timer node from the timerqueue.
*/ */
void timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node) bool timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node)
{ {
WARN_ON_ONCE(RB_EMPTY_NODE(&node->node)); WARN_ON_ONCE(RB_EMPTY_NODE(&node->node));
@ -82,6 +85,7 @@ void timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node)
} }
rb_erase(&node->node, &head->head); rb_erase(&node->node, &head->head);
RB_CLEAR_NODE(&node->node); RB_CLEAR_NODE(&node->node);
return head->next != NULL;
} }
EXPORT_SYMBOL_GPL(timerqueue_del); EXPORT_SYMBOL_GPL(timerqueue_del);