netdev - Re: [PATCH v2 net-next 1/1] ptp_ocp: use bits.h macros for all masks

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Message-ID: <20210817064814.13c57002@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 17 Aug 2021 06:48:14 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH v2 net-next 1/1] ptp_ocp: use bits.h macros for all
 masks

On Tue, 17 Aug 2021 15:24:54 +0300 Andy Shevchenko wrote:
> Currently we are using BIT(), but GENMASK(). Make use of the latter one
> as well (far less error-prone, far more concise).
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/ptp/ptp_ocp.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
> index caf9b37c5eb1..922f92637db8 100644
> --- a/drivers/ptp/ptp_ocp.c
> +++ b/drivers/ptp/ptp_ocp.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0-only
>  /* Copyright (c) 2020 Facebook */
>  
> +#include <linux/bits.h>
>  #include <linux/err.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
> @@ -84,10 +85,10 @@ struct tod_reg {
>  #define TOD_CTRL_DISABLE_FMT_A	BIT(17)
>  #define TOD_CTRL_DISABLE_FMT_B	BIT(16)
>  #define TOD_CTRL_ENABLE		BIT(0)
> -#define TOD_CTRL_GNSS_MASK	((1U << 4) - 1)
> +#define TOD_CTRL_GNSS_MASK	GENMASK(3, 0)
>  #define TOD_CTRL_GNSS_SHIFT	24
>  
> -#define TOD_STATUS_UTC_MASK	0xff
> +#define TOD_STATUS_UTC_MASK	GENMASK(7, 0)
>  #define TOD_STATUS_UTC_VALID	BIT(8)
>  #define TOD_STATUS_LEAP_VALID	BIT(16)

GENMASK is unsigned long:

drivers/ptp/ptp_ocp.c: In function ‘ptp_ocp_tod_info’:
drivers/ptp/ptp_ocp.c:648:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  648 |  dev_info(&bp->pdev->dev, "utc_offset: %d  valid:%d  leap_valid:%d\n",
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/dev_printk.h:19:22: note: in definition of macro ‘dev_fmt’
   19 | #define dev_fmt(fmt) fmt
      |                      ^~~
drivers/ptp/ptp_ocp.c:648:2: note: in expansion of macro ‘dev_info’
  648 |  dev_info(&bp->pdev->dev, "utc_offset: %d  valid:%d  leap_valid:%d\n",
      |  ^~~~~~~~
drivers/ptp/ptp_ocp.c:648:41: note: format string is defined here
  648 |  dev_info(&bp->pdev->dev, "utc_offset: %d  valid:%d  leap_valid:%d\n",
      |                                        ~^
      |                                         |
      |                                         int
      |                                        %ld