linux-kernel - Re: [PATCH 1/7] x86/fpu: Simplify the fpu->last_cpu logic and rename it to fpu->fpregs

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Date:   Thu, 26 Jan 2017 09:54:18 -0500
From:   Rik van Riel <riel@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [PATCH 1/7] x86/fpu: Simplify the fpu->last_cpu logic and
 rename it to fpu->fpregs_cached

On Thu, 2017-01-26 at 12:26 +0100, Ingo Molnar wrote:

> index c56fb57f2991..7eb2f3041fde 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1253,6 +1253,8 @@ void set_task_cpu(struct task_struct *p,
> unsigned int new_cpu)
>  			p->sched_class->migrate_task_rq(p);
>  		p->se.nr_migrations++;
>  		perf_event_task_migrate(p);
> +
> +		arch_task_migrate(p);
>  	}
> 

Does it really count as a "simplification" if you add a
scheduler callback?

This code does not seem any easier to understand than
the old code...