Commit c5491ea7 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar

sched/rt: Add schedule_preempt_disabled()

Add helper to get rid of the ever repeating:

    preempt_enable_no_resched();
    schedule();
    preempt_disable();

patterns.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-wxx7btox7coby6ifv5vzhzgp@git.kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7abc63b1
...@@ -361,6 +361,7 @@ extern signed long schedule_timeout_interruptible(signed long timeout); ...@@ -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_killable(signed long timeout);
extern signed long schedule_timeout_uninterruptible(signed long timeout); extern signed long schedule_timeout_uninterruptible(signed long timeout);
asmlinkage void schedule(void); asmlinkage void schedule(void);
extern void schedule_preempt_disabled(void);
extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
struct nsproxy; struct nsproxy;
......
...@@ -3246,6 +3246,18 @@ asmlinkage void __sched schedule(void) ...@@ -3246,6 +3246,18 @@ asmlinkage void __sched schedule(void)
} }
EXPORT_SYMBOL(schedule); 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 #ifdef CONFIG_MUTEX_SPIN_ON_OWNER
static inline bool owner_running(struct mutex *lock, struct task_struct *owner) static inline bool owner_running(struct mutex *lock, struct task_struct *owner)
......
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