linux-kernel - Re: [-next PATCH 2/4] treewide: Use DEVICE_ATTR

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Date:   Wed, 20 Dec 2017 10:34:03 +0200
From:   Jarkko Nikula <jarkko.nikula@...mer.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Sebastian Ott <sebott@...ux.vnet.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
        James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Airlie <airlied@...ux.ie>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jiri Slaby <jslaby@...e.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
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        Takashi Iwai <tiwai@...e.com>, linux-s390@...r.kernel.org,
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        platform-driver-x86@...r.kernel.org, linux-scsi@...r.kernel.org,
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Subject: Re: [-next PATCH 2/4] treewide: Use DEVICE_ATTR_RW

On Tue, Dec 19, 2017 at 10:15:07AM -0800, Joe Perches wrote:
> Convert DEVICE_ATTR uses to DEVICE_ATTR_RW where possible.
> 
...
  
> diff --git a/sound/soc/omap/mcbsp.c b/sound/soc/omap/mcbsp.c
> index 7a54e3083203..79d4dc785e5c 100644
> --- a/sound/soc/omap/mcbsp.c
> +++ b/sound/soc/omap/mcbsp.c
> @@ -854,7 +854,7 @@ static ssize_t dma_op_mode_store(struct device *dev,
>  	return size;
>  }
>  
> -static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
> +static DEVICE_ATTR_RW(dma_op_mode);
>  
While I can ack this part here if it helps generic cleanup effort I
don't understart would it improve code readability in general? Mode 644
is clear and don't need any grepping but for DEVICE_ATTR_RW() I had to go
through all of these files in order to see what does it mean:

DEVICE_ATTR_RW: include/linux/device.h
__ATTR_RW: include/linux/sysfs.h
S_IWUSR: include/uapi/linux/stat.h
S_IRUGO: include/linux/stat.h

Jarkko Nikula <jarkko.nikula@...mer.com>