linux-kernel - Re: [PATCH 2/6] statfs: use << to align with fs header

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Message-ID: <de6ba300-fbef-07ae-651e-87e25ffd701d@infradead.org>
Date:   Fri, 13 Apr 2018 10:55:23 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andreas Dilger <adilger@...ger.ca>,
        Christian Brauner <christian.brauner@...ntu.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        linux-kernel@...r.kernel.org, serge@...lyn.com
Subject: Re: [PATCH 2/6] statfs: use << to align with fs header

On 04/13/2018 10:35 AM, Andreas Dilger wrote:
> On Apr 13, 2018, at 10:11 AM, Christian Brauner <christian.brauner@...ntu.com> wrote:
>>
>> Consistenly use << to define ST_* constants. This also aligns them with
>> their MS_* counterparts in fs.h
> 
> IMHO, using (1 << 10) makes the code harder to debug.  If you see a field
> in a structure like 0x8354, it is non-trivial to map this to the ST_*
> flags if they are declared in the form (1 << 10) or BIT(10).  If they are
> declared in the form 0x100 (as they are now) then it is trivial that the
> ST_APPEND flag is set in 0x8354, and easy to understand the other flags.
> 
> So, my preference would be to NOT land this or the previous patch.

That makes sense to me.

-- 
~Randy