From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [net-next PATCH 0/3] Replace wmb()/rmb() with dma_wmb()/dma_rmb() where appropriate Date: Tue, 07 Apr 2015 16:55:08 -0700 Message-ID: <20150407235324.1574.63255.stgit@ahduyck-vm-fedora22> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: davem@davemloft.net To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51064 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752871AbbDGXzJ (ORCPT ); Tue, 7 Apr 2015 19:55:09 -0400 Sender: netdev-owner@vger.kernel.org List-ID: This is a start of a side project cleaning up the drivers that can make use of the dma_wmb and dma_rmb calls. The general idea is to start removing the unnecessary wmb/rmb calls from a number of drivers and to make use of the lighter weight dma_wmb/dma_rmb calls as this should allow for an overall improvement in performance as each barrier can cost a significant number of cycles and on architectures such as x86 this is unnecessary. These changes are what I would consider low hanging fruit. The likelihood of the changes introducing an error should be low since the use of the barriers in these cases are fairly obvious. --- Alexander Duyck (3): sungem, sunhme, sunvnet: Update drivers to use dma_wmb/rmb s2io: Update driver to use dma_wmb e1000, e1000e: Use dma_rmb instead of rmb for descriptor read ordering drivers/net/ethernet/intel/e1000/e1000_main.c | 6 +++--- drivers/net/ethernet/intel/e1000e/netdev.c | 8 ++++---- drivers/net/ethernet/neterion/s2io.c | 8 ++++---- drivers/net/ethernet/sun/sungem.c | 14 +++++++------- drivers/net/ethernet/sun/sunhme.c | 16 ++++++++-------- drivers/net/ethernet/sun/sunvnet.c | 6 +++--- 6 files changed, 29 insertions(+), 29 deletions(-) --