netdev - Re: decnet: Fix complier warning

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Message-Id: <20081015.155746.76808335.davem@davemloft.net>
Date:	Wed, 15 Oct 2008 15:57:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	swhiteho@...hat.com
Cc:	bhutchings@...arflare.com, netdev@...r.kernel.org,
	ccaulfie@...hat.com
Subject: Re: decnet: Fix complier warning

From: Steven Whitehouse <swhiteho@...hat.com>
Date: Wed, 15 Oct 2008 13:40:35 +0100

> On Wed, 2008-10-15 at 13:37 +0100, Ben Hutchings wrote:
> > Or you could make this use offsetof().  Daring, I know, it's only been a
> > standard macro for nearly 20 years.
 >
> Yes, thats true. The whole set of code is rather suspect to say the
> least and I was going for the minimal fix. Its a long time since I last
> looked at this code so I don't remember exactly why it was done in that
> way,

I'm going to check in something like the following:

diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 2f0ac3c..ba35258 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -152,7 +152,7 @@ static struct dn_dev_parms dn_dev_list[] =  {
 
 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 
-#define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
+#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 
 #ifdef CONFIG_SYSCTL
 
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