linux-kernel - Re: [PATCH] staging: lustre: mdc: use __FMODE

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Date:	Mon, 17 Nov 2014 16:55:21 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>, oleg.drokin@...el.com,
	devel@...verdev.osuosl.org, andreas.dilger@...el.com,
	linux-kernel@...r.kernel.org, HPDD-discuss@...1.01.org
Subject: Re: [PATCH] staging: lustre: mdc: use __FMODE_EXEC macro

On Mon, Nov 17, 2014 at 04:23:08PM -0800, Juston wrote:
> On Tue, 2014-11-18 at 01:46 +0300, Dan Carpenter wrote:
> > On Mon, Nov 17, 2014 at 02:23:48PM -0800, Juston Li wrote:
> > > FMODE_EXEC is type fmode_t but is used in operations
> > > with integers which leads to sparse warnings:
> > > drivers/staging/lustre/lustre/mdc/mdc_lib.c:198:21: warning: restricted fmode_t degrades to integer
> > > drivers/staging/lustre/lustre/mdc/mdc_locks.c:300:49: warning: restricted fmode_t degrades to integer
> > > 
> > > Fix by using __FMODE_EXEC macro defined in fs.h.
> > > 
> > > Note the same warnings occurs with other fmode flags
> > > here but they don't have a corresponding int macro.
> > > 
> > 
> > When are FMODE_EXEC and __FMODE_EXEC not defined?  I think they're
> > always defined.  I don't understand the point of these ifdefs.  I guess
> > maybe they are for compatability with obsolete kernels?
> > 
> > regards,
> > dan carpenter
> > 
> Seems to be the case. Looked at some old commits (2.6.17) and found
> FMODE_EXEC was mainlined to allow lustre to be installed on a vanilla
> kernel.
> Since you pointed it out, if we are dealing with compatability with 
> obselete kernels, __FMODE_EXEC was added later in 2.6.38. Wondering
> if I should address the case where FMODE_EXEC is defined but 
> __FMODE_EXEC isn't since I currently only check __FMODE_EXEC.

Just fix it up to work the the current kernel version, no need to
support anything else in this codebase.

thanks,

greg k-h
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