From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF297C43331 for ; Fri, 27 Mar 2020 16:10:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC4A020716 for ; Fri, 27 Mar 2020 16:10:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727849AbgC0QKl (ORCPT ); Fri, 27 Mar 2020 12:10:41 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:12205 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726515AbgC0QKc (ORCPT ); Fri, 27 Mar 2020 12:10:32 -0400 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id A0F4D6FF656609A32887; Sat, 28 Mar 2020 00:10:23 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.487.0; Sat, 28 Mar 2020 00:10:16 +0800 From: John Garry To: , CC: , , , , , , , , "John Garry" Subject: [PATCH v2 0/3] io.h, logic_pio: Allow barriers for inX() and outX() be overridden Date: Sat, 28 Mar 2020 00:06:11 +0800 Message-ID: <1585325174-195915-1-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since commits a7851aa54c0c ("io: change outX() to have their own IO barrier overrides") and 87fe2d543f81 ("io: change inX() to have their own IO barrier overrides"), the outX() and inX() functions have memory barriers which can be overridden per-arch. However, under CONFIG_INDIRECT_PIO, logic_pio defines its own version of inX() and outX(), which still use readb et al. For these, the barrier after a raw read is weaker than it otherwise would be. This series generates consistent behaviour for logic_pio, by defining generic _inX() and _outX() in asm-generic/io.h, and using those in logic_pio. Generic _inX() and _outX() have per-arch overrideable barriers. The topic was discussed there originally: https://lore.kernel.org/lkml/2e80d7bc-32a0-cc40-00a9-8a383a1966c2@huawei.com/ A small tidy-up patch is included. I hope that series can go through the arm-soc tree, as with other recent logic_pio changes. Hi Arnd, I added your tag, but please let me know if you have any issue with the updated change in patch #1. cheers - Differences to v1 - fix x86 clang build by adding extra build swicth for _{in,out}X - added Arnd's RB tag John Garry (3): io: Provide _inX() and _outX() logic_pio: Improve macro argument name logic_pio: Use _inX() and _outX() include/asm-generic/io.h | 64 +++++++++++++++++++++++++++++++++--------------- lib/logic_pio.c | 22 ++++++++--------- 2 files changed, 55 insertions(+), 31 deletions(-) -- 2.16.4