linux-kernel - Re: [PATCH] sched/core: remove get_cpu() from sched

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Date:   Mon, 9 Jul 2018 11:01:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/core: remove get_cpu() from sched_fork()

On Fri, Jul 06, 2018 at 03:32:00PM +0200, Sebastian Andrzej Siewior wrote:
> On 2018-07-06 15:18:08 [+0200], Peter Zijlstra wrote:
> > On Fri, Jul 06, 2018 at 03:06:15PM +0200, Sebastian Andrzej Siewior wrote:
> > > Based on this it is possible to remove get_cpu() and use
> > > smp_processor_id() for the `cpu' variable without breaking anything.
> > 
> > Almost.. I think, see init_task_preempt_count().
> 
>  #define init_task_preempt_count(p) do { \
>          task_thread_info(p)->preempt_count = FORK_PREEMPT_COUNT; \
>  } while (0)
> 
> and task_thread_info() references p only. It looks good, what did I
> miss?

Argh, dammit, I read that with p == current :/

Then yes, looks ok.