linux-kernel - Re: [PATCH] timers: Fix up get_target

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Date:   Thu, 6 Jun 2019 12:28:08 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Luiz Capitulino <lcapitulino@...hat.com>
Subject: Re: [PATCH] timers: Fix up get_target_base() to use old base properly

On Mon, Jun 03, 2019 at 09:29:44PM +0800, Peter Xu wrote:
> get_target_base() in the timer code is not using the "base" parameter
> at all.  My gut feeling is that instead of removing that extra
> parameter, what we really want to do is "return the old base if it
> does not suite for a new one".

Hi Peter,

I think its a dead parameter: you always want to use the local base
if the timer is not pinned.

> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: John Stultz <john.stultz@...aro.org>
> CC: Stephen Boyd <sboyd@...nel.org>
> CC: Luiz Capitulino <lcapitulino@...hat.com>
> CC: Marcelo Tosatti <mtosatti@...hat.com>
> CC: linux-kernel@...r.kernel.org
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  kernel/time/timer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/time/timer.c b/kernel/time/timer.c
> index 343c7ba33b1c..6ff6ffd2c719 100644
> --- a/kernel/time/timer.c
> +++ b/kernel/time/timer.c
> @@ -868,7 +868,7 @@ get_target_base(struct timer_base *base, unsigned tflags)
>  	    !(tflags & TIMER_PINNED))
>  		return get_timer_cpu_base(tflags, get_nohz_timer_target());
>  #endif
> -	return get_timer_this_cpu_base(tflags);
> +	return base;
>  }
>  
>  static inline void forward_timer_base(struct timer_base *base)
> -- 
> 2.17.1