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From: Rob Landley <rob@landley.net>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Pavel Machek <pavel@ucw.cz>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Baole Ni <baolex.ni@intel.com>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	chuansheng.liu@intel.com
Subject: Re: Please don't replace numeric parameter like 0444 with macro
Date: Tue, 2 Aug 2016 16:53:11 -0500	[thread overview]
Message-ID: <8f441710-caa7-b746-0556-bde89dea52f2@landley.net> (raw)
In-Reply-To: <CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com>

On 08/02/2016 03:58 PM, Linus Torvalds wrote:
> [ So I answered similarly to another patch, but I'll just re-iterate
> and change the subject line so that it stands out a bit from the
> millions of actual patches ]
> 
> On Tue, Aug 2, 2016 at 1:42 PM, Pavel Machek <pavel@ucw.cz> wrote:
>>
>> Everyone knows what 0644 is, but noone can read S_IRUSR | S_IWUSR |
>> S_IRCRP | S_IROTH (*). Please don't do this.
> 
> Absolutely. It's *much* easier to parse and understand the octal
> numbers, while the symbolic macro names are just random line noise and
> hard as hell to understand. You really have to think about it.

Posix even specifies the numeric value for each macro in the chmod
command's extended description:

  http://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html

Rob

WARNING: multiple messages have this Message-ID (diff)
From: rob@landley.net (Rob Landley)
To: linux-arm-kernel@lists.infradead.org
Subject: Please don't replace numeric parameter like 0444 with macro
Date: Tue, 2 Aug 2016 16:53:11 -0500	[thread overview]
Message-ID: <8f441710-caa7-b746-0556-bde89dea52f2@landley.net> (raw)
In-Reply-To: <CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com>

On 08/02/2016 03:58 PM, Linus Torvalds wrote:
> [ So I answered similarly to another patch, but I'll just re-iterate
> and change the subject line so that it stands out a bit from the
> millions of actual patches ]
> 
> On Tue, Aug 2, 2016 at 1:42 PM, Pavel Machek <pavel@ucw.cz> wrote:
>>
>> Everyone knows what 0644 is, but noone can read S_IRUSR | S_IWUSR |
>> S_IRCRP | S_IROTH (*). Please don't do this.
> 
> Absolutely. It's *much* easier to parse and understand the octal
> numbers, while the symbolic macro names are just random line noise and
> hard as hell to understand. You really have to think about it.

Posix even specifies the numeric value for each macro in the chmod
command's extended description:

  http://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html

Rob

  reply	other threads:[~2016-08-02 21:53 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-02 20:58 Please don't replace numeric parameter like 0444 with macro Linus Torvalds
2016-08-02 20:58 ` Linus Torvalds
2016-08-02 21:53 ` Rob Landley [this message]
2016-08-02 21:53   ` Rob Landley
2016-08-02 23:39 ` [PATCH] checkpatch: Look for symbolic permissions and suggest octal instead Joe Perches
2016-08-03  0:15   ` Al Viro
2016-08-03  0:30     ` Joe Perches
2016-08-15 16:38   ` Joe Perches
2016-08-03  0:42 ` Please don't replace numeric parameter like 0444 with macro Al Viro
2016-08-03  0:42   ` Al Viro
2016-08-03  8:07   ` Konstantin Khlebnikov
2016-08-03  8:07     ` Konstantin Khlebnikov
2016-08-03  8:30     ` Richard Weinberger
2016-08-03  8:30       ` Richard Weinberger
2016-08-03  8:11 ` [PATCH] Add file permission mode helpers Ingo Molnar
2016-08-03  8:11   ` Ingo Molnar
2016-08-03  8:28   ` Greg Kroah-Hartman
2016-08-03  8:28     ` Greg Kroah-Hartman
2016-08-03  8:39     ` Ingo Molnar
2016-08-03  8:39       ` Ingo Molnar
2016-08-03  9:21       ` Willy Tarreau
2016-08-03  9:21         ` Willy Tarreau
2016-08-03  9:53     ` Marcel Holtmann
2016-08-03  9:53       ` Marcel Holtmann
2016-08-03 15:49   ` Joe Perches
2016-08-03 15:49     ` Joe Perches
2016-08-03 16:38   ` Pavel Machek
2016-08-03 16:38     ` Pavel Machek

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