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Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h21
1 files changed, 7 insertions, 14 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2d0546e884ea..9d4797609aa5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1922,23 +1922,16 @@ extern int cond_resched_softirq(void);
/*
* Does a critical section need to be broken due to another
- * task waiting?:
+ * task waiting?: (technically does not depend on CONFIG_PREEMPT,
+ * but a general need for low latency)
*/
-#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
-# define need_lockbreak(lock) ((lock)->break_lock)
-#else
-# define need_lockbreak(lock) 0
-#endif
-
-/*
- * Does a critical section need to be broken due to another
- * task waiting or preemption being signalled:
- */
-static inline int lock_need_resched(spinlock_t *lock)
+static inline int spin_needbreak(spinlock_t *lock)
{
- if (need_lockbreak(lock) || need_resched())
- return 1;
+#ifdef CONFIG_PREEMPT
+ return spin_is_contended(lock);
+#else
return 0;
+#endif
}
/*