Re: [PATCH 7/9] sched: Add migrate_disable()

[Sebastian Andrzej Siewior]

On 2020-09-21 18:36:04 [+0200], Peter Zijlstra wrote:
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1700,6 +1700,68 @@ void check_preempt_curr(struct rq *rq, s
>  
>  #ifdef CONFIG_SMP
>  
> +#ifdef CONFIG_PREEMPT_RT
…
> +static inline bool is_migration_disabled(struct task_struct *p)
> +{
> +	return p->migration_disabled;
> +}

Just a thought: having this with int as return type and defined in a
header file then it could be used in check_preemption_disabled() and in
the tracing output.

> +#else
> +
> +static inline void migrate_disable_switch(struct rq *rq, struct task_struct *p) { }
> +
> +static inline bool is_migration_disabled(struct task_struct *p)
> +{
> +	return false;
> +}
> +
> +#endif

Sebastian