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-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/sched/core.c12
2 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1a6398424fa..03dd224d066 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -361,6 +361,7 @@ extern signed long schedule_timeout_interruptible(signed long timeout);
extern signed long schedule_timeout_killable(signed long timeout);
extern signed long schedule_timeout_uninterruptible(signed long timeout);
asmlinkage void schedule(void);
+extern void schedule_preempt_disabled(void);
extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
struct nsproxy;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 91fe6a0e909..73022395c00 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3246,6 +3246,18 @@ asmlinkage void __sched schedule(void)
}
EXPORT_SYMBOL(schedule);
+/**
+ * schedule_preempt_disabled - called with preemption disabled
+ *
+ * Returns with preemption disabled. Note: preempt_count must be 1
+ */
+void __sched schedule_preempt_disabled(void)
+{
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+}
+
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
static inline bool owner_running(struct mutex *lock, struct task_struct *owner)