sched.h: Move (spin|rwlock)_needbreak() to spinlock.h

This lets us kill the dependency on spinlock.h.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

include/linux/sched.h

@@ -2227,37 +2227,6 @@ static inline bool preempt_model_preemptible(void)
 	return preempt_model_full() || preempt_model_rt();
 }
 
-/*
- * Does a critical section need to be broken due to another
- * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
- * but a general need for low latency)
- */
-static inline int spin_needbreak(spinlock_t *lock)
-{
-#ifdef CONFIG_PREEMPTION
-	return spin_is_contended(lock);
-#else
-	return 0;
-#endif
-}
-
-/*
- * Check if a rwlock is contended.
- * Returns non-zero if there is another task waiting on the rwlock.
- * Returns zero if the lock is not contended or the system / underlying
- * rwlock implementation does not support contention detection.
- * Technically does not depend on CONFIG_PREEMPTION, but a general need
- * for low latency.
- */
-static inline int rwlock_needbreak(rwlock_t *lock)
-{
-#ifdef CONFIG_PREEMPTION
-	return rwlock_is_contended(lock);
-#else
-	return 0;
-#endif
-}
-
 static __always_inline bool need_resched(void)
 {
 	return unlikely(tif_need_resched());

include/linux/spinlock.h

@@ -449,6 +449,37 @@ static __always_inline int spin_is_contended(spinlock_t *lock)
 	return raw_spin_is_contended(&lock->rlock);
 }
 
+/*
+ * Does a critical section need to be broken due to another
+ * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
+ * but a general need for low latency)
+ */
+static inline int spin_needbreak(spinlock_t *lock)
+{
+#ifdef CONFIG_PREEMPTION
+	return spin_is_contended(lock);
+#else
+	return 0;
+#endif
+}
+
+/*
+ * Check if a rwlock is contended.
+ * Returns non-zero if there is another task waiting on the rwlock.
+ * Returns zero if the lock is not contended or the system / underlying
+ * rwlock implementation does not support contention detection.
+ * Technically does not depend on CONFIG_PREEMPTION, but a general need
+ * for low latency.
+ */
+static inline int rwlock_needbreak(rwlock_t *lock)
+{
+#ifdef CONFIG_PREEMPTION
+	return rwlock_is_contended(lock);
+#else
+	return 0;
+#endif
+}
+
 #define assert_spin_locked(lock)	assert_raw_spin_locked(&(lock)->rlock)
 
 #else  /* !CONFIG_PREEMPT_RT */