linux-kernel - Re: [PATCH 05/11] touchscreen: elants: Use octal permissions

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Message-ID: <e257bc89eb082e9fdc342d6f794c15a2805c98a9.camel@perches.com>
Date:   Mon, 23 Jul 2018 10:25:10 -0700
From:   Joe Perches <joe@...ches.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     dev-harsh1998 <harshitjain6751@...il.com>, trivial@...nel.org,
        Simon Budig <simon.budig@...nelconcepts.de>,
        Andi Shyti <andi@...zian.org>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] touchscreen: elants: Use octal permissions

On Mon, 2018-07-23 at 10:18 -0700, Dmitry Torokhov wrote:
> On Mon, Jul 23, 2018 at 03:32:00PM +0200, Greg Kroah-Hartman wrote:
> > On Mon, Jul 23, 2018 at 06:49:20PM +0530, dev-harsh1998 wrote:
> > > WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
> > > +static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL);
> > > 
> > > WARNING: Symbolic permissions 'S_IWUSR' are not preferred. Consider using octal permissions '0200'.
> > > +static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw)
> > > 
> > > WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
> > > +		.dattr = __ATTR(_field, S_IRUGO,			\
> > > 
> > > Signed-off-by: Harshit Jain <harshitjain6751@...il.com>
> > 
> > This name doesn't match up with the From: line above :(
> > 
> > Please fix up and try again.
> 
> dtor@...r-ws:~/kernel/linux-next$ git grep S_IRU | wc -l
> 7605
> 
> We either need to run a tree-wide script or leave this alone. FWIW I am
> perfectly fine with either octals or symbolic names so I do not see
> benefit of doing conversion for code that is not known to be broken.

About half of those are in one subsystem (drivers/hwmon)

$ git grep -w S_IRUGO | cut -f1,2 -d'/' | \
  sort | uniq -c | sort -rn | head -10 | cat -n
     1	   3846 drivers/hwmon
     2	    748 drivers/scsi
     3	    215 drivers/infiniband
     4	    168 drivers/usb
     5	    109 drivers/media
     6	    106 drivers/input
     7	    102 drivers/platform
     8	    101 drivers/misc
     9	    101 drivers/gpu
    10	     91 drivers/edac

The generic reason is octal is readable and S_<FOO> is unintelligible.

https://lkml.org/lkml/2016/8/2/1945