netdev - [PATCH] [NET] fix useless comment reference loop

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Date:	Sun, 04 May 2008 00:05:42 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] [NET] fix useless comment reference loop

include/linux/skbuff.h says:
        /* These elements must be at the end, see alloc_skb() for details.  */

net/core/skbuff.c says:
	* See comment in sk_buff definition, just before the 'tail' member

This patch contains my guess as to the actual reason rather than a
dead comment reference loop.

Signed-off-by: Johannes Berg <johannes@...solutions.net>
---
Not that it probably makes much of a difference anyway.

 net/core/skbuff.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- everything.orig/net/core/skbuff.c	2008-05-04 00:01:25.000000000 +0200
+++ everything/net/core/skbuff.c	2008-05-04 00:02:41.000000000 +0200
@@ -206,7 +206,9 @@ struct sk_buff *__alloc_skb(unsigned int
 		goto nodata;
 
 	/*
-	 * See comment in sk_buff definition, just before the 'tail' member
+	 * Only clear those fields we need to clear, not those that we will
+	 * actually initialise below. Hence, don't put any more fields after
+	 * the tail pointer in struct sk_buff!
 	 */
 	memset(skb, 0, offsetof(struct sk_buff, tail));
 	skb->truesize = size + sizeof(struct sk_buff);


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