linux-kernel - Re: [PATCH v3 1/6] sched: Introduce the finish_arch_post_lock

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Date:	Mon, 27 Feb 2012 15:48:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Ingo Molnar <mingo@...e.hu>, Will Deacon <will.deacon@....com>,
	Frank Rowand <frank.rowand@...sony.com>
Subject: Re: [PATCH v3 1/6] sched: Introduce the
 finish_arch_post_lock_switch() scheduler hook

On Fri, 2012-01-20 at 17:42 +0000, Catalin Marinas wrote:
> This hook is called by the scheduler after rq->lock has been released
> and interrupts enabled. It will be used in subsequent patches on the ARM
> architecture.
> 
> Reviewed-by: Will Deacon <will.deacon@....com>
> Reviewed-by: Frank Rowand <frank.rowand@...sony.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Ingo Molnar <mingo@...e.hu>

Acked-by: Peter Zijlstra <peterz@...radead.org>

> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  kernel/sched/core.c  |    1 +
>  kernel/sched/sched.h |    3 +++
>  2 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index df00cb0..f1db6d8 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1937,6 +1937,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
>  	local_irq_enable();
>  #endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
>  	finish_lock_switch(rq, prev);
> +	finish_arch_post_lock_switch();
>  	trace_sched_stat_sleeptime(current, rq->clock);
>  
>  	fire_sched_in_preempt_notifiers(current);
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 98c0c26..d72483d 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -692,6 +692,9 @@ static inline int task_running(struct rq *rq, struct task_struct *p)
>  #ifndef finish_arch_switch
>  # define finish_arch_switch(prev)	do { } while (0)
>  #endif
> +#ifndef finish_arch_post_lock_switch
> +# define finish_arch_post_lock_switch()	do { } while (0)
> +#endif
>  
>  #ifndef __ARCH_WANT_UNLOCKED_CTXSW
>  static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
> 

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