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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 7CD42C47095 for ; Mon, 24 May 2021 15:13:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7151661057 for ; Mon, 24 May 2021 15:13:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235894AbhEXPOo (ORCPT ); Mon, 24 May 2021 11:14:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:38188 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234847AbhEXPFL (ORCPT ); Mon, 24 May 2021 11:05:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 815F361623; Mon, 24 May 2021 14:50:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621867860; bh=eThF42QgHM2ceyuUbfHXSeQsf1W1pocY7rix57lF/sE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rEDOFOi9AjMvCgz0lft+AWCRqVdlPpBZn4InejMxA86wvDUpUqrULRAuEiEkeATi/ fXp/5RqWnfwu7hdB5qvMt11qWhxaAzWvljqfA/R+Uga3emuSN05mrNgDnmux+bpuhR 8EdmNgeHbuY4q8ubAtnYUUr0yipV0iIew1Z3N49gPDyHxVVYQPinBzPHCBEz/AlrW+ oVa3hZUwrTmNg+uDtDbB3JJUlZJBXK4oYp3/mtWXR1zrPeuHUW0h49Dl0OkCDHmy/Q FcrT5r4x5pIQz+TdxiMhequcznDwwM6adZcYFIk7VB/twWSmNaouwcDCG8MdTwRZsg ZR2lEzodw4h9Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peter Zijlstra , Stafford Horne , Sasha Levin , openrisc@lists.librecores.org Subject: [PATCH AUTOSEL 4.14 16/21] openrisc: Define memory barrier mb Date: Mon, 24 May 2021 10:50:35 -0400 Message-Id: <20210524145040.2499322-16-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210524145040.2499322-1-sashal@kernel.org> References: <20210524145040.2499322-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra [ Upstream commit 8b549c18ae81dbc36fb11e4aa08b8378c599ca95 ] This came up in the discussion of the requirements of qspinlock on an architecture. OpenRISC uses qspinlock, but it was noticed that the memmory barrier was not defined. Peter defined it in the mail thread writing: As near as I can tell this should do. The arch spec only lists this one instruction and the text makes it sound like a completion barrier. This is correct so applying this patch. Signed-off-by: Peter Zijlstra [shorne@gmail.com:Turned the mail into a patch] Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin --- arch/openrisc/include/asm/barrier.h | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 arch/openrisc/include/asm/barrier.h diff --git a/arch/openrisc/include/asm/barrier.h b/arch/openrisc/include/asm/barrier.h new file mode 100644 index 000000000000..7538294721be --- /dev/null +++ b/arch/openrisc/include/asm/barrier.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_BARRIER_H +#define __ASM_BARRIER_H + +#define mb() asm volatile ("l.msync" ::: "memory") + +#include + +#endif /* __ASM_BARRIER_H */ -- 2.30.2