linux-kernel - Re: [PATCH v9 04/10] jiffies: Introduce USER_TICK_USEC and redefine TICK

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Message-ID: <20180406010954.GA4400@lerouge>
Date:   Fri, 6 Apr 2018 03:09:55 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Thomas Ilsche <thomas.ilsche@...dresden.de>,
        Doug Smythies <dsmythies@...us.net>,
        Rik van Riel <riel@...riel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Mike Galbraith <mgalbraith@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Len Brown <len.brown@...el.com>
Subject: Re: [PATCH v9 04/10] jiffies: Introduce USER_TICK_USEC and redefine
 TICK_USEC

On Wed, Apr 04, 2018 at 10:38:34AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Since the subsequent changes will need a TICK_USEC definition
> analogous to TICK_NSEC, rename the existing TICK_USEC as
> USER_TICK_USEC, update its users and redefine TICK_USEC
> accordingly.
> 
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> 
> v8 -> v9: No changes.
> 
> ---
>  drivers/net/ethernet/sfc/mcdi.c |    2 +-
>  include/linux/jiffies.h         |    7 +++++--
>  kernel/time/ntp.c               |    2 +-
>  3 files changed, 7 insertions(+), 4 deletions(-)
> 
> Index: linux-pm/include/linux/jiffies.h
> ===================================================================
> --- linux-pm.orig/include/linux/jiffies.h
> +++ linux-pm/include/linux/jiffies.h
> @@ -62,8 +62,11 @@ extern int register_refined_jiffies(long
>  /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
>  #define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
>  
> -/* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
> -#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
> +/* TICK_USEC is the time between ticks in usec assuming SHIFTED_HZ */
> +#define TICK_USEC ((USEC_PER_SEC + HZ/2) / HZ)

Nit: SHIFTED_HZ doesn't seem to exist anymore.

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>