From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH] net: af_packet: Don't initialize vnet_hdr Date: Thu, 12 May 2011 17:26:23 -0400 (EDT) Message-ID: <20110512.172623.220889608152651989.davem@davemloft.net> References: <18a010357eb63dfd50751c5eb529f6261cf90ecd.1305232529.git.joe@perches.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: joe@perches.com Return-path: In-Reply-To: <18a010357eb63dfd50751c5eb529f6261cf90ecd.1305232529.git.joe@perches.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Joe Perches Date: Thu, 12 May 2011 13:36:10 -0700 > Save a memset, initialize only the portion necessary. > > packet_snd either gets this structure completely from > memcpy_fromiovec or uses only the hdr_len set to 0, > so don't always initialize the structure to 0. > > Signed-off-by: Joe Perches On ARM this won't be tightly packed, therefore you'll leave uninitialized pieces of padding in this structure and this thing is an "on-the-wire" network header. I'm not applying this.