linux-kernel - Re: [PATCH 1/1] sched: make finish_task

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Date:	Fri, 10 Oct 2014 12:06:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Kirill Tkhai <tkhai@...dex.ru>
Subject: Re: [PATCH 1/1] sched: make finish_task_switch() return struct rq *

On Thu, Oct 09, 2014 at 09:32:32PM +0200, Oleg Nesterov wrote:
> @@ -2802,15 +2802,8 @@ need_resched:
>  		rq->curr = next;
>  		++*switch_count;
>  
> -		context_switch(rq, prev, next); /* unlocks the rq */
> -		/*
> -		 * The context switch have flipped the stack from under us
> -		 * and restored the local variables which were saved when
> -		 * this task called schedule() in the past. prev == current
> -		 * is still correct, but it can be moved to another cpu/rq.
> -		 */
> -		cpu = smp_processor_id();
> -		rq = cpu_rq(cpu);
> +		rq = context_switch(rq, prev, next); /* unlocks the rq */
> +		cpu = rq->cpu;

This won't compile on UP, cpu_of(rq) works though.
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