linux-kernel - Re: [PATCH] FILESYSTEMS: Delete unused "int dummy[5]" from inodes_stat

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Message-ID: <Pine.LNX.4.64.0705291406040.4617@localhost.localdomain>
Date:	Tue, 29 May 2007 14:07:01 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] FILESYSTEMS:  Delete unused "int dummy[5]" from
 inodes_stat_t.

On Tue, 29 May 2007, Andrew Morton wrote:

> On Tue, 29 May 2007 13:11:07 -0400 (EDT)
> "Robert P. J. Day" <rpjday@...dspring.com> wrote:
>
> >
> > Delete the apparently unused array "int dummy[5]" from struct
> > inodes_stat_t.
> >
> > Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>
> >
> > ---
> >
> >   no idea what that array is for, but no one seems to care about it.
> > removal compile-tested on x86 with "make allyesconfig" and nobody
> > misses it (unless it's used for padding of some kind).
> >
> >
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index 7cf0c54..dec83dd 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -44,7 +44,6 @@ extern int get_max_files(void);
> >  struct inodes_stat_t {
> >  	int nr_inodes;
> >  	int nr_unused;
> > -	int dummy[5];
> >  };
> >  extern struct inodes_stat_t inodes_stat;
> >
>
> kernel/sysctl.c:
>
> 	{
> 		.ctl_name	= FS_STATINODE,
> 		.procname	= "inode-state",
> 		.data		= &inodes_stat,
> 		.maxlen		= 7*sizeof(int),
> 		.mode		= 0444,
> 		.proc_handler	= &proc_dointvec,
> 	},
>
> akpm:/home/akpm> cat /proc/sys/fs/inode-state
> 608039  178454  0       0       0       0       0
>
> So it _is_ used: to present those five zeroes.  I think this is for
> back-compatibility with some cretaceous-era kernel.

ah, gotcha.  well, i'll leave this up to someone else to do anything
with if they are so inclined.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================
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