| Subject: sched-delay-put-task.patch |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Tue, 31 May 2011 16:59:16 +0200 |
| |
| Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
| --- |
| include/linux/sched.h | 13 +++++++++++++ |
| kernel/fork.c | 11 +++++++++++ |
| 2 files changed, 24 insertions(+) |
| |
| Index: linux-stable/include/linux/sched.h |
| =================================================================== |
| --- linux-stable.orig/include/linux/sched.h |
| +++ linux-stable/include/linux/sched.h |
| @@ -1607,6 +1607,9 @@ struct task_struct { |
| #ifdef CONFIG_UPROBES |
| struct uprobe_task *utask; |
| #endif |
| +#ifdef CONFIG_PREEMPT_RT_BASE |
| + struct rcu_head put_rcu; |
| +#endif |
| }; |
| |
| /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
| @@ -1791,6 +1794,15 @@ extern struct pid *cad_pid; |
| extern void free_task(struct task_struct *tsk); |
| #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
| |
| +#ifdef CONFIG_PREEMPT_RT_BASE |
| +extern void __put_task_struct_cb(struct rcu_head *rhp); |
| + |
| +static inline void put_task_struct(struct task_struct *t) |
| +{ |
| + if (atomic_dec_and_test(&t->usage)) |
| + call_rcu(&t->put_rcu, __put_task_struct_cb); |
| +} |
| +#else |
| extern void __put_task_struct(struct task_struct *t); |
| |
| static inline void put_task_struct(struct task_struct *t) |
| @@ -1798,6 +1810,7 @@ static inline void put_task_struct(struc |
| if (atomic_dec_and_test(&t->usage)) |
| __put_task_struct(t); |
| } |
| +#endif |
| |
| extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
| extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
| Index: linux-stable/kernel/fork.c |
| =================================================================== |
| --- linux-stable.orig/kernel/fork.c |
| +++ linux-stable/kernel/fork.c |
| @@ -244,7 +244,18 @@ void __put_task_struct(struct task_struc |
| if (!profile_handoff_task(tsk)) |
| free_task(tsk); |
| } |
| +#ifndef CONFIG_PREEMPT_RT_BASE |
| EXPORT_SYMBOL_GPL(__put_task_struct); |
| +#else |
| +void __put_task_struct_cb(struct rcu_head *rhp) |
| +{ |
| + struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); |
| + |
| + __put_task_struct(tsk); |
| + |
| +} |
| +EXPORT_SYMBOL_GPL(__put_task_struct_cb); |
| +#endif |
| |
| void __init __weak arch_task_cache_init(void) { } |
| |