From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932075AbbJPJdD (ORCPT ); Fri, 16 Oct 2015 05:33:03 -0400 Received: from out2-smtp.messagingengine.com ([66.111.4.26]:37060 "EHLO out2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751512AbbJPJdA (ORCPT ); Fri, 16 Oct 2015 05:33:00 -0400 X-Sasl-enc: SmhbMwUOM+yiENvcx0HXIY0b3cdcoySVXgHIKutDC1FJ 1444987979 From: Hannes Frederic Sowa To: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org, dvyukov@google.com, davem@davemloft.net, Hannes Frederic Sowa Subject: [PATCH net RESEND 0/2] overflow-arith: begin to add support for overflow builtins functions Date: Fri, 16 Oct 2015 11:32:41 +0200 Message-Id: <1444987963-15327-1-git-send-email-hannes@stressinduktion.org> X-Mailer: git-send-email 2.4.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, I add a new header, linux/overflow-arith.h, as the central place to add overflow and wrap-around checking functions. The reason I am doing so is that it can make use of compiler supported builtin functions which can leverage hardware. As I need this for a fix in the ipv6 stack, which is also included in this series, I propose to add it sooner than later over Davem's net tree. This is also the reason why I start slowly with only the one function I need at this time. Thanks for reviewing! Hannes Frederic Sowa (2): overflow-arith: begin to add support for overflow builtin functions ipv6: protect mtu calculation of wrap-around and infinite loop by rounding issues include/linux/compiler-gcc.h | 4 ++++ include/linux/overflow-arith.h | 18 ++++++++++++++++++ net/ipv6/ip6_output.c | 6 +++++- 3 files changed, 27 insertions(+), 1 deletion(-) create mode 100644 include/linux/overflow-arith.h -- 2.4.3