locking/rtmutex: replace top-waiter and pi_waiters leftmost caching

... with the generic rbtree flavor instead. No changes
in semantics whatsoever.

Link: http://lkml.kernel.org/r/20170719014603.19029-10-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index 8d039b928d61..7453be0485a5 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -45,7 +45,7 @@ struct rt_mutex_waiter {
 
 static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
 {
-        return !RB_EMPTY_ROOT(&lock->waiters);
+        return !RB_EMPTY_ROOT(&lock->waiters.rb_root);
 }
 
 static inline struct rt_mutex_waiter *
@@ -53,8 +53,8 @@ rt_mutex_top_waiter(struct rt_mutex *lock)
 {
         struct rt_mutex_waiter *w;
 
-        w = rb_entry(lock->waiters_leftmost, struct rt_mutex_waiter,
-                     tree_entry);
+        w = rb_entry(lock->waiters.rb_leftmost,
+                     struct rt_mutex_waiter, tree_entry);
         BUG_ON(w->lock != lock);
 
         return w;
@@ -62,14 +62,14 @@ rt_mutex_top_waiter(struct rt_mutex *lock)
 
 static inline int task_has_pi_waiters(struct task_struct *p)
 {
-        return !RB_EMPTY_ROOT(&p->pi_waiters);
+        return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root);
 }
 
 static inline struct rt_mutex_waiter *
 task_top_pi_waiter(struct task_struct *p)
 {
-        return rb_entry(p->pi_waiters_leftmost, struct rt_mutex_waiter,
-                        pi_tree_entry);
+        return rb_entry(p->pi_waiters.rb_leftmost,
+                        struct rt_mutex_waiter, pi_tree_entry);
 }
 
 #else