linux-kernel - Re: [PATCH] removes array

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Message-ID: <Pine.LNX.4.64.0710010546340.15688@localhost.localdomain>
Date:	Mon, 1 Oct 2007 05:48:59 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	roel <12o3l@...cali.nl>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] removes array_size duplicates

On Mon, 1 Oct 2007, Andrew Morton wrote:

> On Fri, 28 Sep 2007 00:51:13 +0200 roel <12o3l@...cali.nl> wrote:
>
> > This patch removes some ARRAY_SIZE macro duplicates. There is also one in
> > arch/um/include/user.h, which isn't fixed here because comments in that file
> > explicitly state a preference for the 'less fancy' version. If that's the
> > case as well for any of the other replacements please comment.
>
> I got a bunch of rejects against various development trees, a
> build error in net/ipv4/ipvs/ip_vs_proto_udp.c and now
>
> net/netfilter/xt_sctp.c: In function 'match_packet':
> net/netfilter/xt_sctp.c:58: error: size of array 'type name' is negative
> net/netfilter/xt_sctp.c:106: error: size of array 'type name' is negative

among other things, one of the creepy issues here is the definition in
include/linux/netfilter/xt_sctp.h of the macro:

...
#define SCTP_CHUNKMAP_COPY(destmap, srcmap)                     \
        do {                                                    \
                int i;                                          \
                for (i = 0; i < ELEMCOUNT(chunkmap); i++)       \
                        destmap[i] = srcmap[i];                 \
        } while (0)
...

  i'm not a big fan of macros that refer to objects that aren't
parameters to the macro, especially when all the rest of them *do*.

rday

p.s.  ELEMCOUNT is simply an alternative to ARRAY_SIZE, which could
certainly be rewritten that way.

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

http://crashcourse.ca
========================================================================
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